Date   

Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace

 

Hi Dennis,
You've spent more time searching for those bases just on this list than it
takes to make one. If anyone else needs any (VERY unlikely imo....) they
can make some themselves or if many people need it they'll find a source
for sure. Do the pragmatic thing and make bases yourself.

On Mon, 27 Mar 2017 17:35 'Dennis Tillman' dennis@ridesoft.com [TekScopes],
<TekScopes@yahoogroups.com> wrote:

Hi Michael,
I have all the machine shop tools and skills to make my own. Time is the
one thing that is in short supply. It is important to find a source if one
exists. At the moment my needs are such that I could make them myself. In
the future, depending on what happens with the VTCT I may have a need for
more of these than I can reasonably make by hand because of how much time
they take.
Thanks for the link to the Amphenol catalog. That was very interesting
reading.
Dennis Tillman W7PF

-----Original Message-----
Sent: Monday, March 27, 2017 3:13 AM
Subject: RE: [TekScopes] Re: A Vacuum Tube Curve Tracer for all Tek
Semiconductor Curve Trace

Have you considered making your own? 1/8" phenolic or fiberglass epoxy
sheet is cheap on Ebay, along with various sizes of round acrylic plastic
disks. Thread some brass rod, and tap holes in the insulator of you choice.
A nut on the reverse side will keep it secure.

If there is enough interest, I could build a batch of them. I have 7 pin,
9 pin, and other tubes to use as models. I may still have some of the rare
10 in, which is a nine pin plus a single center pin which was used for some
mixer applications. Noval and Compactron bases can be made the same way.

I will be making some four pin plugs the make connectors for some obsolete
batteries this way. The fun part is that the battery has the male pins,
with 90VDC on two of the pins so I will add a switch to disable it until
the plug is seated into the recessed connector.

Here is a scan of an old Amphenol catalog that contains older tube sockets
for your reference:

http://www.tubebooks.org/file_downloads/Amphenol.pdf

-----Original Message-----
From: "'Dennis Tillman' dennis@ridesoft.com [TekScopes]"
<TekScopes@yahoogroups.com>
Sent: Mar 26, 2017 10:45 PM
To: TekScopes@yahoogroups.com
Subject: RE: [TekScopes] Re: A Vacuum Tube Curve Tracer for all Tek
Semiconductor Curve Trace

Hi Bill,
In my case I needed tube PLUGS that would plug into a tube SOCKET. That
is my problem.

I am well aware of Tubesandmore. They certainly have a nice selection
of 4 pin, 5 pin, 7 pin, 8 pin , and 9 pin tube SOCKETS. Unfortunately
other than
8 pin tube PLUGS they, or anyone else for that matter, do not sell 7
pin miniature tube PLUGS or 9 pin miniature PLUGS. Since 7 pin
miniature tubes and 9 pin miniature tubes have their pins coming right
out of the glass envelope this will make it very hard to get what I
need by smashing spent tubes to try and get an intact set of pins around
the base of the tube.

As John Gord pointed out one way to find some of these is by searching
for socket savers. They, too, are scarce these days. Not many people
are designing things with tubes. There was a 9 pin and a 7 pin socket
saver auction on Ebay and I bid $28 for them but someone outbid me. I
have no way to know how high that person's ultimate bid might have been.

Dennis Tillman, W7PF

-----Original Message-----
Sent: Sunday, March 26, 2017 5:08 PM
Subject: Re: [TekScopes] Re: A Vacuum Tube Curve Tracer for all Tek
Semiconductor Curve Trace

Dennis and all,
Has everyone been overlooking the best source for tubes and related
hardware?

https://www.tubesandmore.com/products/tube_accessories
Bill
KB3DKS

-----Original Message-----
From: 'Dennis Tillman' dennis@ridesoft.com [TekScopes]
<TekScopes@yahoogroups.com>
Sent: Wed, Mar 22, 2017 10:06 am

Hi John,
Thanks for the suggestion. I know I kept coming across octal socket
savers all the time but I never saw a 7 pin or 9 pin socket saver. I
will give that a try.
Dennis Tillman W7PF

-----Original Message-----
Sent: Tuesday, March 21, 2017 5:06 PM
Subject: RE: [TekScopes] Re: A Vacuum Tube Curve Tracer for all Tek
Semiconductor Curve Trace

Try a Google search for "7 pin socket saver". I got some hits. 9 pin
socket savers seem to be more common. It looks like at least some of
the socket savers could be disassembled.
--John Gord
------------------------------------
Posted by: Doxemf <doxemf@aol.com>
------------------------------------
------------------------------------
Posted by: "Michael A. Terrell" <mike.terrell@earthlink.net>
------------------------------------



------------------------------------
Posted by: "Dennis Tillman" <dennis@ridesoft.com>
------------------------------------


------------------------------------

Yahoo Groups Links




Tek 464 - Advice on soldering shielding mesh to Vertical Output IC case

Fabio Trevisan
 

Hello Guys,
A couple of weeks ago, with the help of this forum, I came to conclude that
my 464's vertical output amplifier IC was defective (U464... part#
155-0115-00.)
I just got a new one and I`m about to install it the following days.
I`m usually confident in regards to soldering and normally I don't give it
second thoughts... but this IC takes a relatively "heavy" shielding mesh to
be soldered to its case... and I`m a bit shaky.
Do you have some advice?
Will it help to screw the IC to a heatsink so, at least its base and I
suppose its die will take longer to heat? (I think I'll do it anyway, just
in case).
Thanks for any tip?
BRgrds,
Fabio


Re: OT: FET matching

Ed Breya
 

Yet another thing - if the lead inductance can't be reduced, and it represents a relatively large power loss to dispose of, maybe consider making the snubber into a recycler, such that most of the energy in each cycle is returned to the source rather than dissipated. This would of course require extra components like a small transformer and rectifiers. If you can arrange it so the kickback (but none the forward) current goes through the transformer, you can step it up to the main cap voltage and dump some charge back into it, increasing overall efficiency and reducing the heat load in the guts.

I'm picturing a ferrite or powder core toroidal transformer, maybe a couple of inches diameter being about right for the power level.

Ed


Re: tube sockets and plugs for the new tube curve tracer

 

Hi Walter,
I looked through the Eby web site and found no plugs of any kind. They do
have lots of sockets for tubes as well as for some transistors.

Dennis Tillman W7PF

-----Original Message-----
Sent: Monday, March 27, 2017 11:37 AM
Subject: [TekScopes] tube sockets and plugs for the new tube curve tracer

Eby still makes all kinds of tube sockets AND plugs, and they do make custom
ones, have a look here:

http://www.ebycompany.com/sockets.shtml
http://www.ebycompany.com/sockets.shtml

also, for interfacing to tube testers, an octal plug works, which you can
scavenge from many unwanted octal tubes easily. hickock and others used
this technique themselves to tie to things like compactron adaptors, etc. .
it does require slightly altered pin settings to get to multi-element tubes,
but that is not a big deal, and is exactly what they did.

you can also easily MAKE a nice 7/9 tube plug simply by using stock loose
male connector pins from d-sub connectors, or ms-connector pins, and a
simple little round board to support them. it can also sport a little tab
or center hole/stand-off to hold down a cable strain relief.

finally, an even better plan, may be to simply make a pendant cable tied to
the inside tube tester wiring, brought out to a 9 pin d-sub connector for
easy interfacing.

all the best,
walter
------------------------------------
Posted by: walter2@sphere.bc.ca
------------------------------------


tube sockets and plugs for the new tube curve tracer

 

Eby still makes all kinds of tube sockets AND plugs, and they do make custom ones, have a look here:

http://www.ebycompany.com/sockets.shtml http://www.ebycompany.com/sockets.shtml

also, for interfacing to tube testers, an octal plug works, which you can scavenge from many unwanted octal tubes easily. hickock and others used this technique themselves to tie to things like compactron adaptors, etc. . it does require slightly altered pin settings to get to multi-element tubes, but that is not a big deal, and is exactly what they did.

you can also easily MAKE a nice 7/9 tube plug simply by using stock loose male connector pins from d-sub connectors, or ms-connector pins, and a simple little round board to support them. it can also sport a little tab or center hole/stand-off to hold down a cable strain relief.

finally, an even better plan, may be to simply make a pendant cable tied to the inside tube tester wiring, brought out to a 9 pin d-sub connector for easy interfacing.

all the best,
walter


Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace

 

Hi Bruce,
Vector still makes pins of the right diameter and length (Vector part
number: K24C/C) that I could press into a PC Board and make a plug that way,
but nobody seems to have these pins in stock.
Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@yahoogroups.com [mailto:TekScopes@yahoogroups.com]
Sent: Monday, March 27, 2017 8:38 AM
To: TekScopes@yahoogroups.com
Subject: [TekScopes] Re: A Vacuum Tube Curve Tracer for all Tek
Semiconductor Curve Trace

Vector used to sell little extruded round aluminum cans with 7-pin and 9-pin
tube pin bases. The bases attached with side screws. These were used for
constructing special plug-in modules. I don't know if they are still in the
Vector product line.

Bruce, KG6OJI
------------------------------------
Posted by: brucekareen@aol.com
------------------------------------


Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace

 

Hi Bruce,
I will take a look at Vector. I was aware they sold them in the past but I
am not sure about now.
Dennis Tillman W7PF

-----Original Message-----
Sent: Monday, March 27, 2017 8:38 AM
Subject: [TekScopes] Re: A Vacuum Tube Curve Tracer for all Tek
Semiconductor Curve Trace

Vector used to sell little extruded round aluminum cans with 7-pin and 9-pin
tube pin bases. The bases attached with side screws. These were used for
constructing special plug-in modules. I don't know if they are still in the
Vector product line.

Bruce, KG6OJI
------------------------------------
Posted by: brucekareen@aol.com
------------------------------------


Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace

 

Hi Barry,
I found the Leeds Radio list last week but it was hard to decipher and I had several other sites that looked more promising so I forgot to go back and search through their tiny print.

I will give them a much more careful look now that I have the Amphenol catalog (thanks to Michael A. Terrell) and I can see what it is Leeds Radio is referring to on each line item in their list.
Dennis Tillman W7PF

-----Original Message-----
Sent: Monday, March 27, 2017 7:42 AM
Subject: Re: [TekScopes] Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace

Have you looked here?

http://www.leedsradio.com/parts-sockets.html

Thanks,
Barry - N4BUQ


Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace

 

Vector used to sell little extruded round aluminum cans with 7-pin and 9-pin tube pin bases. The bases attached with side screws. These were used for constructing special plug-in modules. I don't know if they are still in the Vector product line.

Bruce, KG6OJI


Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace

 

Hi David,
Sorry for the confusion. I'm looking for plugs, not sockets. There are lots
of sockets available in many different configurations. So far there are only
two socket saver variations (9-pin and 8-pin) which I can disassemble to get
the plug part. I'm still looking for a way to get a 7-pin plug so I can
avoid making them by hand.
Dennis Tillman W7PF

-----Original Message-----
Sent: Monday, March 27, 2017 5:26 AM
Subject: Re: [TekScopes] Re: A Vacuum Tube Curve Tracer for all Tek
Semiconductor Curve Trace

At this point I am not sure if you are looking for a socket or a plug but in
either case, they make pins and large collet sockets which can be swaged or
soldered into printed circuit board material.

On Sun, 26 Mar 2017 21:56:22 -0700, you wrote:

Hi Cheater,
In a pinch I did make a 9 pin plug using 0.040" bus bar pushed into an
existing 9 pin socket, with a piece of PVC tubing around it, and I potted
the entire thing. What you get is crude, and it takes a fair amount of time
to do this. So this is hardly a reasonable solution except in a pinch. I was
hoping for something that was much more professional and took far less time.
I don't mind paying $10 for a plug that I can order from somewhere.

Some of the tube stuff seems to have disappeared, and other stuff seems to
be doing just fine. I haven't figured out which stuff is rare that I should
jump at them whenever they show up versus the stuff that is still very
common and still being produced. I'm new to the whole tube world. Last time
I touched a vacuum tube was 40+ years ago until very recently.

Dennis Tillman W7PF
------------------------------------
Posted by: David <davidwhess@gmail.com>
------------------------------------


Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace

 

Hi Michael,
I have all the machine shop tools and skills to make my own. Time is the one thing that is in short supply. It is important to find a source if one exists. At the moment my needs are such that I could make them myself. In the future, depending on what happens with the VTCT I may have a need for more of these than I can reasonably make by hand because of how much time they take.
Thanks for the link to the Amphenol catalog. That was very interesting reading.
Dennis Tillman W7PF

-----Original Message-----
Sent: Monday, March 27, 2017 3:13 AM
Subject: RE: [TekScopes] Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace

Have you considered making your own? 1/8" phenolic or fiberglass epoxy sheet is cheap on Ebay, along with various sizes of round acrylic plastic disks. Thread some brass rod, and tap holes in the insulator of you choice. A nut on the reverse side will keep it secure.

If there is enough interest, I could build a batch of them. I have 7 pin, 9 pin, and other tubes to use as models. I may still have some of the rare 10 in, which is a nine pin plus a single center pin which was used for some mixer applications. Noval and Compactron bases can be made the same way.

I will be making some four pin plugs the make connectors for some obsolete batteries this way. The fun part is that the battery has the male pins, with 90VDC on two of the pins so I will add a switch to disable it until the plug is seated into the recessed connector.

Here is a scan of an old Amphenol catalog that contains older tube sockets for your reference:

http://www.tubebooks.org/file_downloads/Amphenol.pdf

-----Original Message-----
From: "'Dennis Tillman' dennis@ridesoft.com [TekScopes]"
<TekScopes@yahoogroups.com>
Sent: Mar 26, 2017 10:45 PM
To: TekScopes@yahoogroups.com
Subject: RE: [TekScopes] Re: A Vacuum Tube Curve Tracer for all Tek
Semiconductor Curve Trace

Hi Bill,
In my case I needed tube PLUGS that would plug into a tube SOCKET. That
is my problem.

I am well aware of Tubesandmore. They certainly have a nice selection
of 4 pin, 5 pin, 7 pin, 8 pin , and 9 pin tube SOCKETS. Unfortunately
other than
8 pin tube PLUGS they, or anyone else for that matter, do not sell 7
pin miniature tube PLUGS or 9 pin miniature PLUGS. Since 7 pin
miniature tubes and 9 pin miniature tubes have their pins coming right
out of the glass envelope this will make it very hard to get what I
need by smashing spent tubes to try and get an intact set of pins around the base of the tube.

As John Gord pointed out one way to find some of these is by searching
for socket savers. They, too, are scarce these days. Not many people
are designing things with tubes. There was a 9 pin and a 7 pin socket
saver auction on Ebay and I bid $28 for them but someone outbid me. I
have no way to know how high that person's ultimate bid might have been.

Dennis Tillman, W7PF

-----Original Message-----
Sent: Sunday, March 26, 2017 5:08 PM
Subject: Re: [TekScopes] Re: A Vacuum Tube Curve Tracer for all Tek
Semiconductor Curve Trace

Dennis and all,
Has everyone been overlooking the best source for tubes and related
hardware?

https://www.tubesandmore.com/products/tube_accessories
Bill
KB3DKS

-----Original Message-----
From: 'Dennis Tillman' dennis@ridesoft.com [TekScopes]
<TekScopes@yahoogroups.com>
Sent: Wed, Mar 22, 2017 10:06 am

Hi John,
Thanks for the suggestion. I know I kept coming across octal socket
savers all the time but I never saw a 7 pin or 9 pin socket saver. I
will give that a try.
Dennis Tillman W7PF

-----Original Message-----
Sent: Tuesday, March 21, 2017 5:06 PM
Subject: RE: [TekScopes] Re: A Vacuum Tube Curve Tracer for all Tek
Semiconductor Curve Trace

Try a Google search for "7 pin socket saver". I got some hits. 9 pin
socket savers seem to be more common. It looks like at least some of
the socket savers could be disassembled.
--John Gord
------------------------------------
Posted by: Doxemf <doxemf@aol.com>
------------------------------------
------------------------------------
Posted by: "Michael A. Terrell" <mike.terrell@earthlink.net>
------------------------------------


Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace

 

Hi Butch,
Thanks for your first post. I hope you find reasons to do more in the
future.
I already knew about this site and their 9-pin socket saver. There are
several sites selling the 9-pin socket savers. So far nobody is selling
7-pin socket savers. As far as I can tell.
Dennis Tillman W7PF

-----Original Message-----
Sent: Monday, March 27, 2017 2:23 AM
Subject: RE: [TekScopes] Re: A Vacuum Tube Curve Tracer for all Tek
Semiconductor Curve Trace

https://tubedepot.com/products/9-pin-socket-saver
https://tubedepot.com/products/9-pin-socket-saver

This place has the 9 pin socket saver and a lot of other things including an
8 pin and converter.
Hope this helps!
First time posting... Long time learning here.
Butch

------------------------------------
Posted by: butchwhitt@yahoo.com
------------------------------------


Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace

 

Hi Ed,
That is actually possible to do. The first plug I made was done in a similar
way. Your way would result in two at a time. But that still takes a
considerable amount of time to do. The 8-pin and 9-pin socket savers are
cheap enough that it is worth buying them and cutting them up to save time.
Dennis Tillman W7PF

-----Original Message-----
Sent: Sunday, March 26, 2017 11:34 PM
Subject: RE: [TekScopes] Re: A Vacuum Tube Curve Tracer for all Tek
Semiconductor Curve Trace

Hey Dennis, this just occurred to me - if you can't find any off-shelf
miniature tube style plugs, how about just cutting some pin stock to make
them extra long, and jam them into a socket to form a male plug assembly.
You should be able to solder the pins to the lugs on this socket, or epoxy
it up to keep it together.

It would effectively start as a female-female adapter, with the loose pins
joining two sockets face to face - one as an alignment jig, and the other to
become the plug assembly once the pins are bonded to it somehow. Any base
style that has reverse-axial symmetry could have plugs made in this way.

Ed
------------------------------------
Posted by: edbreya@yahoo.com
------------------------------------


Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace

 

Hi Dave,
I need one or two.
I did find a source for 9-pin socket savers. Those can be opened up and the
plug part separated from the socket. They are less than $3 so I will buy
those. Same for 8-pin octal socket savers. So far I haven't found any 7-pin
socket savers still being sold. One was sold on Ebay the other day but my
$28 bid was not enough to win it.
Dennis Tillman W7PF

-----Original Message-----
Sent: Sunday, March 26, 2017 10:59 PM
Subject: RE: [TekScopes] Re: A Vacuum Tube Curve Tracer for all Tek
Semiconductor Curve Trace

Dennis
How many of the 7 and 9 pin plugs do you need? Are you looking for a
significant number?
73
Dave, ZL3FJ

-----Original Message-----
Sent: Monday, March 27, 2017 3:46 PM
Subject: RE: [TekScopes] Re: A Vacuum Tube Curve Tracer for all Tek
Semiconductor Curve Trace

Hi Bill,
In my case I needed tube PLUGS that would plug into a tube SOCKET. That is
my problem.

I am well aware of Tubesandmore. They certainly have a nice selection of 4
pin, 5 pin, 7 pin, 8 pin , and 9 pin tube SOCKETS. Unfortunately other than
8 pin tube PLUGS they, or anyone else for that matter, do not sell 7 pin
miniature tube PLUGS or 9 pin miniature PLUGS. Since 7 pin miniature tubes
and 9 pin miniature tubes have their pins coming right out of the glass
envelope this will make it very hard to get what I need by smashing spent
tubes to try and get an intact set of pins around the base of the tube.

As John Gord pointed out one way to find some of these is by searching for
socket savers. They, too, are scarce these days. Not many people are
designing things with tubes. There was a 9 pin and a 7 pin socket saver
auction on Ebay and I bid $28 for them but someone outbid me. I have no way
to know how high that person's ultimate bid might have been.

Dennis Tillman, W7PF

-----Original Message-----
Sent: Sunday, March 26, 2017 5:08 PM
Subject: Re: [TekScopes] Re: A Vacuum Tube Curve Tracer for all Tek
Semiconductor Curve Trace

Dennis and all,
Has everyone been overlooking the best source for tubes and related
hardware?

https://www.tubesandmore.com/products/tube_accessories
Bill
KB3DKS

-----Original Message-----
From: 'Dennis Tillman' dennis@ridesoft.com [TekScopes]
<TekScopes@yahoogroups.com>
Sent: Wed, Mar 22, 2017 10:06 am

Hi John,
Thanks for the suggestion. I know I kept coming across octal socket savers
all the time but I never saw a 7 pin or 9 pin socket saver. I will give that
a try.
Dennis Tillman W7PF

-----Original Message-----
Sent: Tuesday, March 21, 2017 5:06 PM
Subject: RE: [TekScopes] Re: A Vacuum Tube Curve Tracer for all Tek
Semiconductor Curve Trace

Try a Google search for "7 pin socket saver". I got some hits. 9 pin
socket savers seem to be more common. It looks like at least some of the
socket savers could be disassembled.
--John Gord
------------------------------------
Posted by: Doxemf <doxemf@aol.com>
------------------------------------




------------------------------------
Posted by: "Dennis Tillman" <dennis@ridesoft.com>
------------------------------------


------------------------------------

Yahoo Groups Links





------------------------------------
Posted by: "Dave Brown" <tractorb@ihug.co.nz>
------------------------------------


------------------------------------

Yahoo Groups Links


Re: CORRECTION: Tek 2445 vs Tek 2430A (My bad, originally sent as vs 2435A)

Siggi
 

On Sun, 26 Mar 2017 at 22:05 Lee Houde houdatto@gmail.com [TekScopes] <
TekScopes@yahoogroups.com> wrote:



I have 3 Tek 2445 scopes and one Tek 2430A scope. While idly bumming around
eBay, I noticed that it seemed to me the 2445s were less common and on
average more expensive than the 2430As. Seeing as how the 2430A is a DSO
and the 2445 is analog I would have expected the opposite. Am I wrong in
this thinking or am I missing something?
Hey Lee,

I don't have a direct answer to your question, except to say that my 2430
is a pretty limited DSO. The update rate is pretty low, the realtime
bandwidth is limited to ~40MHz and the record length is only 1024 samples.
The only features the 2430A has over a 2445 are pre-trigger signal viewing,
and some measurements (this is very limited on my 2430, I've never used a
2430A).
I'd guess that's why the 2430A isn't too popular, it just wasn't a super
great scope to begin with.

Try looking as something like a video signal or an AM modulated carrier,
and I bet you'll run for your 2445s.

Siggi


Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace

n4buq
 

Have you looked here?

http://www.leedsradio.com/parts-sockets.html

Thanks,
Barry - N4BUQ

Hi Bill,
In my case I needed tube PLUGS that would plug into a tube SOCKET. That is
my problem.

I am well aware of Tubesandmore. They certainly have a nice selection of 4
pin, 5 pin, 7 pin, 8 pin , and 9 pin tube SOCKETS. Unfortunately other than
8 pin tube PLUGS they, or anyone else for that matter, do not sell 7 pin
miniature tube PLUGS or 9 pin miniature PLUGS. Since 7 pin miniature tubes
and 9 pin miniature tubes have their pins coming right out of the glass
envelope this will make it very hard to get what I need by smashing spent
tubes to try and get an intact set of pins around the base of the tube.

As John Gord pointed out one way to find some of these is by searching for
socket savers. They, too, are scarce these days. Not many people are
designing things with tubes. There was a 9 pin and a 7 pin socket saver
auction on Ebay and I bid $28 for them but someone outbid me. I have no way
to know how high that person's ultimate bid might have been.

Dennis Tillman, W7PF


Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace

 

At this point I am not sure if you are looking for a socket or a plug
but in either case, they make pins and large collet sockets which can
be swaged or soldered into printed circuit board material.

On Sun, 26 Mar 2017 21:56:22 -0700, you wrote:

Hi Cheater,
In a pinch I did make a 9 pin plug using 0.040" bus bar pushed into an existing 9 pin socket, with a piece of PVC tubing around it, and I potted the entire thing. What you get is crude, and it takes a fair amount of time to do this. So this is hardly a reasonable solution except in a pinch. I was hoping for something that was much more professional and took far less time. I don't mind paying $10 for a plug that I can order from somewhere.

Some of the tube stuff seems to have disappeared, and other stuff seems to be doing just fine. I haven't figured out which stuff is rare that I should jump at them whenever they show up versus the stuff that is still very common and still being produced. I'm new to the whole tube world. Last time I touched a vacuum tube was 40+ years ago until very recently.

Dennis Tillman W7PF


Re: CORRECTED POST : Tek 2445 vs Tek 2430A (Tek 2435A)

 

In 1991, the 2445B was $4000 and the 2430A was $8000 from Tektronix
but it would not surprise me of Tektronix sold more entry level 2430/A
DSOs than low bandwidth 2445/A/B analog oscilloscopes leading to the
situation today where the 2430/A is more common than the 2445/A/B
because at the time, DSOs with automatic measurements were very rare
but analog oscilloscopes were common.

On 27 Mar 2017 02:14:30 +0000, you wrote:

I have 3 Tek 2445 scopes and one Tek 2430A scope. While idly bumming around eBay, I noticed that it seemed to me the 2445s were less common and on average more expensive than the 2430As. Seeing as how the 2430A is a DSO and the 2445 is analog I would have expected the opposite. Am I wrong in this thinking or am I missing something?


Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace

Michael A. Terrell
 

Have you considered making your own? 1/8" phenolic or fiberglass epoxy sheet is cheap on Ebay, along with various sizes of round acrylic plastic disks. Thread some brass rod, and tap holes in the insulator of you choice. A nut on the reverse side will keep it secure.

If there is enough interest, I could build a batch of them. I have 7 pin, 9 pin, and other tubes to use as models. I may still have some of the rare 10 in, which is a nine pin plus a single center pin which was used for some mixer applications. Noval and Compactron bases can be made the same way.

I will be making some four pin plugs the make connectors for some obsolete batteries this way. The fun part is that the battery has the male pins, with 90VDC on two of the pins so I will add a switch to disable it until the plug is seated into the recessed connector.

Here is a scan of an old Amphenol catalog that contains older tube sockets for your reference:

http://www.tubebooks.org/file_downloads/Amphenol.pdf

-----Original Message-----
From: "'Dennis Tillman' dennis@ridesoft.com [TekScopes]" <TekScopes@yahoogroups.com>
Sent: Mar 26, 2017 10:45 PM
To: TekScopes@yahoogroups.com
Subject: RE: [TekScopes] Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace

Hi Bill,
In my case I needed tube PLUGS that would plug into a tube SOCKET. That is
my problem.

I am well aware of Tubesandmore. They certainly have a nice selection of 4
pin, 5 pin, 7 pin, 8 pin , and 9 pin tube SOCKETS. Unfortunately other than
8 pin tube PLUGS they, or anyone else for that matter, do not sell 7 pin
miniature tube PLUGS or 9 pin miniature PLUGS. Since 7 pin miniature tubes
and 9 pin miniature tubes have their pins coming right out of the glass
envelope this will make it very hard to get what I need by smashing spent
tubes to try and get an intact set of pins around the base of the tube.

As John Gord pointed out one way to find some of these is by searching for
socket savers. They, too, are scarce these days. Not many people are
designing things with tubes. There was a 9 pin and a 7 pin socket saver
auction on Ebay and I bid $28 for them but someone outbid me. I have no way
to know how high that person's ultimate bid might have been.

Dennis Tillman, W7PF

-----Original Message-----
Sent: Sunday, March 26, 2017 5:08 PM
Subject: Re: [TekScopes] Re: A Vacuum Tube Curve Tracer for all Tek
Semiconductor Curve Trace

Dennis and all,
Has everyone been overlooking the best source for tubes and related
hardware?

https://www.tubesandmore.com/products/tube_accessories
Bill
KB3DKS

-----Original Message-----
From: 'Dennis Tillman' dennis@ridesoft.com [TekScopes]
<TekScopes@yahoogroups.com>
Sent: Wed, Mar 22, 2017 10:06 am

Hi John,
Thanks for the suggestion. I know I kept coming across octal socket savers
all the time but I never saw a 7 pin or 9 pin socket saver. I will give that
a try.
Dennis Tillman W7PF

-----Original Message-----
Sent: Tuesday, March 21, 2017 5:06 PM
Subject: RE: [TekScopes] Re: A Vacuum Tube Curve Tracer for all Tek
Semiconductor Curve Trace

Try a Google search for "7 pin socket saver". I got some hits. 9 pin
socket savers seem to be more common. It looks like at least some of the
socket savers could be disassembled.
--John Gord
------------------------------------
Posted by: Doxemf <doxemf@aol.com>
------------------------------------


Michael A. Terrell


Re: A Vacuum Tube Curve Tracer for all Tek Semiconductor Curve Trace

butchwhitt@...
 

https://tubedepot.com/products/9-pin-socket-saver https://tubedepot.com/products/9-pin-socket-saver


This place has the 9 pin socket saver and a lot of other things including an 8 pin
and converter.


Hope this helps!


First time posting... Long time learning here.


Butch

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