Date   

Re: TM5006 needs a fan speed control

si_emi_01
 

Try Ametek Rotron.
 
Ross


From: TekScopes@... [mailto:TekScopes@...] On Behalf Of Greg Werstiuk
Sent: Monday, February 08, 2010 1:35 AM
To: TekScopes@...
Subject: RE: [TekScopes] Re: TM5006 needs a fan speed control

 

While their web site has not yet been pulled down, Comair/Rotron ceased operation in 2008.

The following statements are currently found at the Farnell/Newark and R S Electronics web sites:

“Comair Rotron is no longer in business. Very limited product is available through Newark while supplies last. Newark recommends that customers seek alternatives.”

Comair Rotron ceased manufacturing fans and blowers and filed for bankruptcy in 2008.


From: TekScopes@yahoogroups.com [mailto:TekScopes@yahoogroups.com] On Behalf Of victor.silva
Sent: Sunday, February 07, 2010 9:22 PM
To: TekScopes@yahoogroups.com
Subject: [TekScopes] Re: TM5006 needs a fan speed control

 

If you had looked at the link I posted it would show that ROTRON is not only in business they still produce the same fan used in the original TM5006.

So which EBM PAPST or NMB fan would you recommend to replace the equivalent ROTRON product?

--Victor


--- In TekScopes@yahoogroups.com, "John B" > wrote:
>
> Hi group,
>
> I am not sure if Rotron is still in business. I did some extensive testing selecting fans for a product. Along the way I discovered a "Fan Law":
>
> For a given size of fan, the acoustic noise will rise by 3dB for a 15% increase in cooling.
>
>
> I tested fans from a wide range of manufacturers. In the end I recommended two.
>
> EBM papst
>
> and
>
> NMB
>
> These are both long-time manufacturers of quality fans.
>
>
> John VE3XRY
>
> ---> TM5006 (STD UNIT):
> > ROTRON WR2H1 (aka 027119), 75-80CFM, 10W, 120VAC
> >
> > TM5006 (OPTION 10, 12)
> > ROTRON MU2A1 (aka 028021), 105CFM, 14W, 120VAC
> >
> > TM5006A (STD, 02, 12, 15):
> > ROTRON WR2H1 (aka 027119), 75-80CFM, 10W, 120VAC
> >
> > TM5006 (OPTION 10)
> > ROTRON MU2A1 (aka 028021), 105CFM, 14W, 120VAC
> >
> > The Rotron WR2H1 is what I used previously. It is fairly quite when new.
> > Option 10 is rack mount TM5006x, I don't know what opt 12 is.
> > If a TM5006A is being used on a bench I would say a Rotron WR2H1 can safely be used. OR if you want to experiment, try a slightly less airflow ROTRON WR2M1, 66CFM. I tried one of these and it's almost silent. It makes the TM5006 sound like a TM506!
> >
> > http://www.comairrotron.com/ac_fans.shtml
> >
> > BTW: ROTRON is now Comair Rotron Fan Co.
>


Re: TM5006 needs a fan speed control

Robert Simpson
 

Great!


--- On Mon, 2/8/10, trigview wrote:

From: trigview
Subject: [TekScopes] Re: TM5006 needs a fan speed control
To: TekScopes@...
Date: Monday, February 8, 2010, 4:49 PM

 


Hi Bob,
I'll try to send you some pictures later this week.
Joe

--- In TekScopes@yahoogrou ps.com, Robert Simpson wrote:
>
> Joe,
>  
> What fan did you add to a 7603 and how did you locate it, connect it etc. (Pictures?)? I have thought about doing that to one of mine. Sometimes I am working in my garage on TVs when it is pretty warm. I use a floor fan to keep me cool, but thought these older (Like me) Tek 7603s might also live longer with some cooling help.
>  
> Bob
>
> --- On Sun, 2/7/10, trigview wrote:
>
>
> From: trigview
> Subject: [TekScopes] Re: TM5006 needs a fan speed control
> To: TekScopes@yahoogrou ps.com
> Date: Sunday, February 7, 2010, 6:26 PM
>
>
>  
>
>
>
>
> Dave, if you want to do without the variable speed, just add a small power resistor (330 ohm 7 W)in series with the fan. It allows you to lower the fan noise to something more acceptable and still provide plenty of cooling capacity.
> I did this for a loud 4.5" fan that I added to a 7603. Works great and no EMI issues.
> Joe
>
> --- In TekScopes@yahoogrou ps.com, David Gravereaux wrote:
> >
> > Hi,
> >
> > Just picked one up and am displeased with how loud this is. Anyone have
> > a mod for making the fan speed adjustable based on surface temp of the
> > heatsinks it is cooling?
> >
>



Re: TM5006 needs a fan speed control

victor.silva
 

I based my reply on my own test of a plugin I made. The plugin is a one slot wide and houses a Rubidium oscillator, FE5680A. during my design I measured the regulator heatsink temperature in my plugin and it was definitely running hotter with the other five slots open as compared to plugging in fillers or other plugins.

It is also based informally on the other plug-in's feel to the touch when operated with and without the filler.

If the filler was for cosmetic purposes only why is it designed with an internal baffle (base) to keep airflow even across plug-ins and fillers?

--Victor

--- In TekScopes@..., "Steve" <ditter2@...> wrote:

You don't need to plug unused holes in TM5006/5003 to assure cooling in the occupied slots. The baffle system was designed specifically to assure all plug-ins receive roughtly the same amount of cooling air, regardless of compartments being occupied or not. We learned a lot from problems in the TM503.

The blank plug in caps were mainly used in rack mount applications, and desk top production test applications, where the frame was configured permenently.

- Steve


--- In TekScopes@..., "Tim Phillips" <tim@> wrote:

from Tim P (UK)
just a thought, but are there cooling issues with not
having the crate full? If one has a 6-holer with only
four plug-ins, should one put blanking plates in
the unused spaces to maintain correct airflow?
I was testing a 547 / 1A1 combo using an extension
cable, and stuffed a towel into the plug-in hole to
ensure the airflow went through the 'scope and not
just out the hole.

Tim


Re: TM5006 needs a fan speed control

trigview
 

Hi Bob,
I'll try to send you some pictures later this week.
Joe

--- In TekScopes@..., Robert Simpson <go_boating_fast@...> wrote:

Joe,
 
What fan did you add to a 7603 and how did you locate it, connect it etc. (Pictures?)? I have thought about doing that to one of mine. Sometimes I am working in my garage on TVs when it is pretty warm. I use a floor fan to keep me cool, but thought these older (Like me) Tek 7603s might also live longer with some cooling help.
 
Bob

--- On Sun, 2/7/10, trigview <trigview@...> wrote:


From: trigview <trigview@...>
Subject: [TekScopes] Re: TM5006 needs a fan speed control
To: TekScopes@...
Date: Sunday, February 7, 2010, 6:26 PM


 




Dave, if you want to do without the variable speed, just add a small power resistor (330 ohm 7 W)in series with the fan. It allows you to lower the fan noise to something more acceptable and still provide plenty of cooling capacity.
I did this for a loud 4.5" fan that I added to a 7603. Works great and no EMI issues.
Joe

--- In TekScopes@yahoogrou ps.com, David Gravereaux <davygrvy@ .> wrote:

Hi,

Just picked one up and am displeased with how loud this is. Anyone have
a mod for making the fan speed adjustable based on surface temp of the
heatsinks it is cooling?


Simple fix for scope probe leads...

Lyle Bickley
 

I purchased a "working FET probe" on eBay. The probe did indeed work - but, unfortunately, the leads (power and probe) were both covered with a white powdery residue. The leads also felt less flexible than they should have (I have another FET probe of the same type for comparison).

I did some research and determined that compounds used to rejuvenate auto vinyl and rubber interiors would likely work well on probe leads. Here are the important factors I found to help decide what compound to use:

1) Never use "rejuvenators" which contain alcohol, benzene, or petroleum. They tend to remove the compounds in the item being repaired which protect it from UV exposure and maintain its flexibility. While they may temporarily make the item look good, they end up doing more harm than good.

2) Do use water based compounds. They are more expensive than the above, but do no harm, and provide good protection, etc.

3) I found only a few brands which met the above criteria. The best being "ArmorAll - Original"

I put generous quantities of "ArmorAll" on a cloth, and used it to completely coat the probe leads and power leads. I wiped off any excess solution with a clean, dry cloth.

This completely eliminated the powder on the lead surface, and resulted in clean, moderately shiny and comfortably flexible leads.

My "new" probe now matches the looks and physical flexibility of my other FET probe of the same type ;-)

BTW: The above procedure did not affect the calibration, frequency response, or latency of the probe.

Cheers,
Lyle
--
Lyle Bickley, KF6ZGI
Bickley Consulting West Inc.
http://bickleywest.com
"Black holes are where God is dividing by zero"


Re: Tektronix 2235 preregulator

tom jobe <tomjobe@...>
 

Hi Graeme,
The Tekscopes message archive has lots of information about your 2235
question, including what common component to substitute for what, when you
replace components.
Many of the 22xx's have the same basic power supply (PS), such as 2213A,
2215A, 2224, 2230, 2232, 2236 etc.
There is also a fine 22xx power supply repair document available from our
friend Hakan at:
http://www.hakanh.com/dl/docs/troubleshooting_tips_on_2200_ps.pdf
His method of injecting the 43 volts from an external source works very well
in a case like yours. It is a big help in figuring out what is wrong in a
complex system.
From my own experiences, the least likely thing to fail is the PWM chip
U930, but your testing will often make you think it is the problem when it
actually isn't. Obviously U930 can be bad, however unlikely that might be.
There is no "unobtanium" in the 22xx PS, and there are common substitutes
for the PS's components that are not proprietary such as the transformers.
Even the transformers are available used if you look around.
tom jobe...

----- Original Message -----
From: "zl1gbb" <zl1gbb@...>
To: <TekScopes@...>
Sent: Monday, February 08, 2010 12:40 PM
Subject: [TekScopes] Tektronix 2235 preregulator


Hi
I have a 2235 oscilloscope which appears dead (no lights, no trace). Fuse
is not blowing. I have no voltage on the 43v preregulator line.

Is there any common problems with this model?

tia
Graeme



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

Yahoo! Groups Links



Re: 7903 quickie

teamlarryohio
 

RICHARD SOLOMON <w1ksz@q.com> wrote:

I thought the rack mount was an R7904 or R7903 ?? Not sure they made
a rack mount 7904.
7903 = 3 bays
7904 = 4 bays
I don't believe there was a bench format 7903 (vs rackmount). The
R7903 was a non-A 7904 repackaged. 4-hole 7Ks were too wide to be
rack mounted.
-ls-


Re: TM5006 needs a fan speed control

David Gravereaux
 

trigview wrote:
Dave, if you want to do without the variable speed, just add a small power resistor (330 ohm 7 W)in series with the fan. It allows you to lower the fan noise to something more acceptable and still provide plenty of cooling capacity.
I did this for a loud 4.5" fan that I added to a 7603. Works great and no EMI issues.
Joe
Thanks Joe. Yes, that's a quick fix, but like all EEs, we just want to
over-design everything ;)


Re: Emailing: tekCopyrightRelease.pdf

Peter Gottlieb <hpnpilot@...>
 

Not only is it not very nice, but it's this kind of trouble that causes attorneys to not want to do any favors for groups like us.


David DiGiacomo wrote:

I believe that Tek DID release the copyrights on Concept Books, but I would like to see it posted on Tek�s web site. It may actually BE there but I can�t find it. Yes, I did call Tom Lenihan (Tek�c copyright attorney) to ask him where I can find the info on Tek�s site and he does not return my calls.
Well, Tom Lenihan didn't post it on the Tek web site, he emailed it to
me (and I believe to everyone else who had asked him about the
subject). Are you really claiming that I forged the copy on my web
site? That's not very nice of you.

He probably sent a copy to you as well. Have you looked in your old email?


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

Yahoo! Groups Links





Re: Tektronix 2235 preregulator

Kevin Wood G7BCS
 

Hi
I have a 2235 oscilloscope which appears dead (no lights, no trace). Fuse
is not blowing. I have no voltage on the 43v preregulator line.

Is there any common problems with this model?
I had a similar problem with my 2236 a while back. The switching
transistor (from memory, a MOSFET on a heatsink just behind the cooling
fan) had died. The fan had also seized up so I suspect it probably
overheated. Replaced the MOSFET and substituted the fan for a computer fan
of the same size and it's been fine since.

Kevin


Re: 7903 quickie

d.seiter@...
 

The 7903's are rackmount and the 7904x's are cabinets.  Maybe I'm totally off base, but shouldn't the R7903 innards be more or less identical to either the 7904 or 7904A (similar BW and function)?  Obviously it's 3 slot vs 4 slot so the main interface, etc will be different.  I'm thinking that since the 7903 shares the '85 catalog with the 7904A, that they may be similar, but like I said before, maybe they are totally different.

 

I'm hoping the OPT4 has a good CRT, as that is the one I'm really interested in. 

 

Dave

----- Original Message -----
From: "RICHARD SOLOMON"
To: tekscopes@...
Sent: Monday, February 8, 2010 3:02:38 PM GMT -08:00 US/Canada Pacific
Subject: RE: [TekScopes] 7903 quickie

 

I thought the rack mount was an R7904 or R7903 ?? Not sure they made
a rack mount 7904.
7903 = 3 bays
7904 = 4 bays

73, Dick, W1KSZ

> To: TekScopes@...
> From: larrys@...
> Date: Mon, 8 Feb 2010 15:48:29 -0500
> Subject: Re: [TekScopes] 7903 quickie
>
> "componenx" <d.seiter@...> wrote:
> > Quick question- is the 7903 a kin of the 7904 or 7904A? Or is it a
> > completely different beast? I'm picking up 3 tomorrow (one is a /4),
> > and was just curious.
>
> Non-A, rackmount.
> -ls-
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
> <*> To visit your group on the web, go to:
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>
> <*> Your email settings:
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>
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Re: Emailing: tekCopyrightRelease.pdf

David DiGiacomo
 

I believe that Tek DID release the copyrights on Concept Books, but I would like to see it posted on Tek’s web site.  It may actually BE there but I can’t find it.  Yes, I did call Tom Lenihan (Tek’c copyright attorney) to ask him where I can find the info on Tek’s site and he does not return my calls.
Well, Tom Lenihan didn't post it on the Tek web site, he emailed it to
me (and I believe to everyone else who had asked him about the
subject). Are you really claiming that I forged the copy on my web
site? That's not very nice of you.

He probably sent a copy to you as well. Have you looked in your old email?


Re: Emailing: tekCopyrightRelease.pdf

Stan & Patricia Griffiths
 

Yes, that is how it appears on David DiGiacomo’s site, but where and how does it appear on Tek’s site?  I can’t find it.

 

Stan

 


From: TekScopes@... [mailto:TekScopes@...] On Behalf Of Steve Wiseman
Sent: Friday, February 05, 2010 7:18 AM
To: TekScopes@...
Subject: Re: [TekScopes] Emailing: tekCopyrightRelease.pdf

 

 

On 05/02/2010, Ralph Cameron <ramcam@magma.ca> wrote:
> Hi Stan:
>
> No but one could approach the same attorney at Tek, if hes still there. I'll
> research that a bit and see what I can come up with.

http://www.slack.com/TE/TekConcepts/TektronixPolicyonCopying.pdf

contains "Tektronix hereby grants permission and license for others to
reproduce and distribute the Tektronix Concept Book series. "

I take it I'm missing something obvious - it seems pretty clear to me.

Steve


Re: Emailing: tekCopyrightRelease.pdf

Stan & Patricia Griffiths
 

I believe that Tek DID release the copyrights on Concept Books, but I would like to see it posted on Tek’s web site.  It may actually BE there but I can’t find it.  Yes, I did call Tom Lenihan (Tek’c copyright attorney) to ask him where I can find the info on Tek’s site and he does not return my calls.

 

Stan

 


From: TekScopes@... [mailto:TekScopes@...] On Behalf Of Ralph Cameron
Sent: Friday, February 05, 2010 6:51 AM
To: TekScopes@...
Subject: Re: [TekScopes] Emailing: tekCopyrightRelease.pdf

 

 

Hi Stan:

 

No but one could approach the same attorney at Tek, if hes still there. I'll research that a bit and see what I can come up with.

 

Ralph


Re: 7903 quickie

RICHARD SOLOMON <w1ksz@...>
 

I thought the rack mount was an R7904 or R7903 ?? Not sure they made
a rack mount 7904.
7903 = 3 bays
7904 = 4 bays

73, Dick, W1KSZ

> To: TekScopes@...
> From: larrys@...
> Date: Mon, 8 Feb 2010 15:48:29 -0500
> Subject: Re: [TekScopes] 7903 quickie
>
> "componenx" wrote:
> > Quick question- is the 7903 a kin of the 7904 or 7904A? Or is it a
> > completely different beast? I'm picking up 3 tomorrow (one is a /4),
> > and was just curious.
>
> Non-A, rackmount.
> -ls-
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
> <*> To visit your group on the web, go to:
> http://groups.yahoo.com/group/TekScopes/
>
> <*> Your email settings:
> Individual Email | Traditional
>
> <*> To change settings online go to:
> http://groups.yahoo.com/group/TekScopes/join
> (Yahoo! ID required)
>
> <*> To change settings via email:
> TekScopes-digest@...
> TekScopes-fullfeatured@...
>
> <*> To unsubscribe from this group, send an email to:
> TekScopes-unsubscribe@...
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>


Tektronix 608 service manual

f5bqp_pfm <pfmonet@...>
 

Hi,

I'm trying to find out the service manual for the Tektronix 608 monitor.
Can you help?

Many thanks in advance.

Best regards
pf
(Pierre-Francois)


Re: Early Serial Numbers

Stan & Patricia Griffiths
 

Hi Dave,

 

I don’t want to rain on your parade either, but I suspect the serial number on your RM16 is bogus.  Here is why.  When that instrument was built, Tek was using leading zeros in their serial numbers so yours should be “000172” and the material it is stamped on should be aluminum and not plastic.  Plastic serial number inserts came much later . . .

 

Stan

 


From: TekScopes@... [mailto:TekScopes@...] On Behalf Of David Race
Sent: Thursday, February 04, 2010 3:38 PM
To: TekScopes@...
Subject: RE: [TekScopes] Early Serial Numbers

 

 

Not one to hijack threads or show off me relics (never), my lowest numbered Teks are an RM16 with serial 172 (a bit overdue for recalibration LOL). And I like the look of the black number on that "faux ivory" (?) insert.

 

 

Also my earliest of a 422 is #000375

 

 

Those pics are at least a couple/few years old and of course those two scopes are much cleaner now and working fine. I also have a later 422 and a parts unit. Why hell, I had another good 422 that I gave my brother one year for a Christmas present. I like the 422...

 

Dave

--- On Thu, 2/4/10, David Wise com> wrote:


From: David Wise com>
Subject: RE: [TekScopes] Early Serial Numbers
To: "TekScopes@yahoogroups.com" <TekScopes@yahoogroups.com>
Date: Thursday, February 4, 2010, 11:06 AM

 

I have one too. 535 s/n 75, stamped on the panel.

Dave Wise

-----Original Message-----
From: TekScopes@yahoogrou ps.com [mailto:TekScopes@yahoogrou ps.com] On Behalf Of Stan & Patricia Griffiths
Sent: Thursday, February 04, 2010 5:33 AM
To: TekScopes@yahoogrou ps.com
Subject: RE: [TekScopes] Early Serial Numbers

Tektronix went through some evolutions in serial number schemes. I believe the very earliest were three digits and the first production model was s/n 101. I think preproduction and engineering models were below 100. I have some with serial numbers in the 90's, like I have 570 s/n 99. Also, on these early instruments, the serial numbers were stamped right into the front panel. It was in the late 50's that Tek started using aluminum inserts


Re: 7903 quickie

fjh001
 

/4 = option 04 ?

This is the reduced scan 4x5cm CRT display

Regards,

Javier

componenx escribi�:


Quick question- is the 7903 a kin of the 7904 or 7904A? Or is it a completely different beast? I'm picking up 3 tomorrow (one is a /4), and was just curious.

Dave

--
------------------------------------------------------------------------
Javier Herrero EMAIL: jherrero@...
HV Sistemas S.L. PHONE: +34 949 336 806
Los Charcones, 17A FAX: +34 949 336 792
19170 El Casar - Guadalajara - Spain WEB: http://www.hvsistemas.com


SC504 attenuator mystery

Jerry Massengale <jmassen418@...>
 

Hi,
 
I have an SC504 that gets some signal thru although not to scale for settings up to 20mv/div, acts open above that. Repeated efforts to clean switches have failed. The weird thing is that both channels act the same way. Any suggestions before I attempt attenuator surgery? Anyone have a donor with two good attenuators and  a good volts/div knob?
 
jerry


Re: 7903 quickie

teamlarryohio
 

"componenx" <d.seiter@...> wrote:
Quick question- is the 7903 a kin of the 7904 or 7904A? Or is it a
completely different beast? I'm picking up 3 tomorrow (one is a /4),
and was just curious.
Non-A, rackmount.
-ls-

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