Date   
Re: OT: App that keeps track of "Or Best Offer" auctions on eBay to tell you what a seller will accept.

Kevin Oconnor
 

FWIW, and more OT, I sell frequently on eBay, but almost never in auction format. I will use BIN with or without offers. When eBay shifted to profit on final value with essentially free listing it made no sense to me to continue the uncertainty of auction format. I know what margins I need to make an acceptable profit. If you have no cost basis in an item an auction may be ok, otherwise you are either under or overpriced.
eBays current returns policy is also onerous. eBay is becoming like amazon in that they will let a customer return an item for any reason. The seller generally can’t fight it. If your customer pays the shipping costs, you will have to credit the final value, refund the shipping costs and pay the return shipping if you want the item back.
I have sold electronics where the buyer removed components and returned the item as defective. eBay won’t do anything.
I now sell a lot of items with free shipping. I build the costs into the pricing. I pay FVF on the total and figure that into my margins. Whether or not I offer a guarantee, the customer always has to pay the return shipping before a refund is issued. Customers think twice if there is a hard return cost.
On eBay you have zero clarity on best-offers which, in my experience, range from 100% to 25%.

Kevin

"Volts/Div" knob for Tek 2235 needed [ Tek part No : 366-2148-01]

donald collie
 

I only really need the clear plastic skirt on this knob [minimum], or two
complete knobs [maximum], as I can probably repair the other one, which has
a cracked skirt. Willing to pay for these. Probably also used on other 22xx
types.
Also : I replaced the chopper MOSFET in the psu with a NZ$1-60 generic
type. It gets very hot to my way of thinking - too hot to hold your finger
on the heatsink near it- does anyone know if an exact replacement is
necessary - perhaps a faster type with lower losses. The MOSFET`s molex
socket shows signs of being quite hot over some time [browning]
Thankyou in anticipation for your
reply.........................................................Donald ZL4GX

Replacing Power LED/light on TEK 2465BCT

oakley@...
 

I just acquired a very low-hour 2465BCT. Everything seems to work perfectly with one exception, it appears that the Power LED/light is not working. Is this part easy to replace?

I'm an EE and none of the internal workings scare me, but I'd probably ignore the indicator light right now if it requires a bunch of work to replace. Thanks!

Tom

Re: OT: App that keeps track of "Or Best Offer" auctions on eBay to tell you what a seller will accept.

Jim Potter
 

I'm with you on eBay sales. I never use the auction format, and if I every buy anything that's auctioned I snipe in the last few seconds.

However, I don't understand what you mean by your last comment, "On eBay you have zero clarity on best-offers which, in my experience, range from 100% to 25%."

I usually set the lower limit for notification of best offers at the minimum I will accept, usually 75% of my BIN price, automatically rejecting lower offers. I have seen a number of instances where the potential buyer keeps increasing his offer until he gets over the threshold. Rather than dicker I always accept that offer. If I make an offer that is explicitly rejected by the seller I will counteroffer to split the difference, but I won't deal with someone who will only go $10 discount on a $500 item, unless of course it's a must have item, in which case I would have taken his BIN price immediately.

Thanks for your comments.

Jim

Re: "Volts/Div" knob for Tek 2235 needed [ Tek part No : 366-2148-01]

tom jobe
 

One of the members of Tekscopes makes new replacement volt/div knob skirts for the 2235. I have bought some of them from him and they are very nice.
He also carries some hard to find good used/tested parts for the 2235 such as the main transformer (T948?), the high voltage multiplier (U975?), etc.
This link shows what he has in stock for sale on eBay at the moment, he must be out of those 2235 knob skirts temporarily.
https://www.ebay.com/sch/shockcore/m.html?item=273836542787&hash=item3fc1ee0b43%3Ag%3AHUcAAOSwZQRYf5YX&rt=nc&_trksid=p2047675.l2562
He is a great guy to do business with as his 100% eBay customer satisfaction rating shows.
I have bought several sets of his new replacement 2235 volt/div knob skirts and they work perfectly.
About he only way you can make a mess of the knob skirt replacement is to  use too much glue.
A few very tiny dabs of glue/epoxy at the smallest diameter of the knob register is all you need, and there is a notch that orients the skirt to the knob just like the original had.
The member name he uses on Tekscopes escapes me at the moment, but you can contact him through any of his eBay auction pages such as this page for his 2235 main transformers.
https://www.ebay.com/itm/Tektronix-120-1601-01-SwitchmodeTransformer-for-2213A-2215A-2235-Oscilloscope/273836542796?hash=item3fc1ee0b4c:g:bAQAAOSwnrJbfX~4
tom jobe...

On 5/24/2019 9:44 PM, donald collie wrote:
I only really need the clear plastic skirt on this knob [minimum], or two
complete knobs [maximum], as I can probably repair the other one, which has
a cracked skirt. Willing to pay for these. Probably also used on other 22xx
types.
Also : I replaced the chopper MOSFET in the psu with a NZ$1-60 generic
type. It gets very hot to my way of thinking - too hot to hold your finger
on the heatsink near it- does anyone know if an exact replacement is
necessary - perhaps a faster type with lower losses. The MOSFET`s molex
socket shows signs of being quite hot over some time [browning]
Thankyou in anticipation for your
reply.........................................................Donald ZL4GX

Re: Replacing Power LED/light on TEK 2465BCT

Chuck Harris
 

There is no power indicator light.

-Chuck Harris

oakley@... wrote:

I just acquired a very low-hour 2465BCT. Everything seems to work perfectly with one exception, it appears that the Power LED/light is not working. Is this part easy to replace?

I'm an EE and none of the internal workings scare me, but I'd probably ignore the indicator light right now if it requires a bunch of work to replace. Thanks!

Tom



Re: Replacing Power LED/light on TEK 2465BCT

Dan Rae
 

On 5/24/2019 10:03 PM, oakley@... wrote:
I just acquired a very low-hour 2465BCT. Everything seems to work perfectly with one exception, it appears that the Power LED/light is not working. Is this part easy to replace?
Tom, there is no Power LED as such.?? And the Hours counter can be set to zero or any number you like as part of the calibration process, so...

Dan

Re: Replacing Power LED/light on TEK 2465BCT

Tony Fleming
 

Mine 2465DMS has no light - it is a switch - when you press it in, a green
internal insert is visible so it looks like a very dim light, but there
isn't any light there - at least on mine.
BUT I don't have your model exactly, so I don't know if changes were made
in yours.

On Sat, May 25, 2019 at 12:37 AM <oakley@...> wrote:

I just acquired a very low-hour 2465BCT. Everything seems to work
perfectly with one exception, it appears that the Power LED/light is not
working. Is this part easy to replace?

I'm an EE and none of the internal workings scare me, but I'd probably
ignore the indicator light right now if it requires a bunch of work to
replace. Thanks!

Tom



Re: OT: App that keeps track of "Or Best Offer" auctions on eBay to tell you what a seller will accept.

tekscopegroup@...
 

On Wed, May 22, 2019 at 03:28 PM, Tom Gardner wrote:
Regrettably goofbid appears to return zero results, at the moment.

Maybe ebay have stymied them, maybe they have a simple server problem. I hope
it is the latter.
Another tool I use a lot and before any purchase to check out the "real" feedback story of a seller is a Firefox addon called EbayNegs. While ebay only bases the seller's current rating on the last 12 months of activity, and that is the most you will see, this app will dig up the dirt from years before. And this one too, sometimes used to report that was being blocked by ebay, but usually works quite well. As a matter of fact come to think of it its been a good while now (months) since I last saw it being blocked, so guess they figured out a way to stop the blockage from ebay. I remember some years ago when it stopped working completely because ebay had changed the format of the sellers link on the listing page, I contacted the author of the addon to let him know. I got a nice thank you within 24 hours and it took just another day or so for it to be back up and running.

Re: Replacing Power LED/light on TEK 2465BCT

Ken Winterling
 

I have a 2465DVS which is essentially the same scope.  It, too, has the mechanical green indicator built into the power button.Ken WA2LBI LG G6 ------ Original message------From: Tony FlemingDate: Sat, May 25, 2019 10:42To: TekScopes@groups.io;Cc: Subject:Re: [TekScopes] Replacing Power LED/light on TEK 2465BCTMine 2465DMS has no light - it is a switch - when you press it in, a green
internal insert is visible so it looks like a very dim light, but there
isn't any light there - at least on mine.
BUT I don't have your model exactly, so I don't know if changes were made
in yours.

On Sat, May 25, 2019 at 12:37 AM wrote:

I just acquired a very low-hour 2465BCT. Everything seems to work
perfectly with one exception, it appears that the Power LED/light is not
working. Is this part easy to replace?

I'm an EE and none of the internal workings scare me, but I'd probably
ignore the indicator light right now if it requires a bunch of work to
replace. Thanks!

Tom



Re: Replacing Power LED/light on TEK 2465BCT

Chuck Harris
 

For what it is worth, the little green indicator
is mechanically very fidgety and delicate, and
is often broken on the scopes I get for repair

The problem is a very tiny push arm moves the
shutters that hide the green spot, it breaks,
and is too small to glue.

The only way to reliably fix it is to replace it.

-Chuck Harris

Ken Winterling wrote:

I have a 2465DVS which is essentially the same scope. It, too, has the mechanical green indicator built into the power button.Ken WA2LBI LG G6 ------ Original message------From: Tony FlemingDate: Sat, May 25, 2019 10:42To: TekScopes@groups.io;Cc: Subject:Re: [TekScopes] Replacing Power LED/light on TEK 2465BCTMine 2465DMS has no light - it is a switch - when you press it in, a green
internal insert is visible so it looks like a very dim light, but there
isn't any light there - at least on mine.
BUT I don't have your model exactly, so I don't know if changes were made
in yours.

On Sat, May 25, 2019 at 12:37 AM wrote:

I just acquired a very low-hour 2465BCT. Everything seems to work
perfectly with one exception, it appears that the Power LED/light is not
working. Is this part easy to replace?

I'm an EE and none of the internal workings scare me, but I'd probably
ignore the indicator light right now if it requires a bunch of work to
replace. Thanks!

Tom








Re: Replacing Power LED/light on TEK 2465BCT

satbeginner
 

Re: 465B Attenuator servicing

NigelP
 

OK I think we bottomed out the IPA bit but what I really need to know is quite specific to the mechanics of the assembly. I may not have seen everything about this in the manual but the small bit I read implied that in order to service the actual attenuator board I need to remove the complete assembly of BOTH CH1 & CH2 attenuators including the mode switch which seems to come out as a complete system.

However looking at the mechs (and I have serviced similar Tek cam switches before) it would seem possible to undo just a few threaded bushes and remove the attenuator board on its own off the cam assembly without having to remove the whole lot as I've mentioned above? I do know that on some cam switches, if you are not careful you end up with some no-longer-captive nuts which can easily get mislaid!! Forewarned is fore-armed! I don't think the manual has an exploded mechnical assembly diagram which would shed light on this methodology, but I may have missed it.

Re: Replacing Power LED/light on TEK 2465BCT

Chuck Harris
 

I had no idea the part wasn't tektronix made!

Very useful information!

-Chuck Harris

satbeginner wrote:

Re: 497p front panel cal failure (CF and Ref Lvl)

radioconnection@...
 

Well, it did it once, then repeated attempts failed. Would bad power supply bypass caps on the PC boards cause problems? I have a few caps that are open or high ESR, all are decoupling caps on the power supply rails on various boards. Parts on order, but won't be here until next week from Mouser. Power supply voltages are good, and I don't see appreciable noise or ripple.

Re: Replacing Power LED/light on TEK 2465BCT

oakley@...
 

Thanks for all of the responses.

Originally, I glanced at the green "legend" to the right of the ON/OFF mechanical aperture switch and assumed that I was seeing the front of a green LED sitting behind a windowed membrane. Now after looking closer, it's just a colored legend, so the repair or replacement of the green LED just got much easier ;-)

Although my scope appears to be operating quite close to specification, there were no visible calibration stickers on the unit to gauge how long since its last cal. Any recommendations for calibration of my scope (people, place, labs)?

Tom

Re: Replacing Power LED/light on TEK 2465BCT

John Ferguson
 

Where are you?

I ask because Chuck Harris calibrated one of my?? 2445Bs?? as well as re-capping the PS and fixing some other problems.?? I am happy with the result and the cost was fair.

He lives in Maryland.

From South Florida, shipping was $39 each way FedEx ground.?? I was fortunate to still have the box that scope had shipped in from my Ebay source.?? His packing job was well thought out and the box heavy duty. It's now made at least three trips and maybe two more if I decide to have my 2465 calibrated too.

John

On 5/25/19 3:10 PM, oakley@... wrote:
Thanks for all of the responses.

Originally, I glanced at the green "legend" to the right of the ON/OFF mechanical aperture switch and assumed that I was seeing the front of a green LED sitting behind a windowed membrane. Now after looking closer, it's just a colored legend, so the repair or replacement of the green LED just got much easier ;-)

Although my scope appears to be operating quite close to specification, there were no visible calibration stickers on the unit to gauge how long since its last cal. Any recommendations for calibration of my scope (people, place, labs)?

Tom


Re: Replacing Power LED/light on TEK 2465BCT

Tony Fleming
 

If you like a green LED in the POWER-PUSH-BUTTON, one could put one in, but
it is a lot of work!
Or one could just put a small opening somewhere near by and wire green LED
that is powered from the scope.....

On Sat, May 25, 2019 at 2:10 PM <oakley@...> wrote:

Thanks for all of the responses.

Originally, I glanced at the green "legend" to the right of the ON/OFF
mechanical aperture switch and assumed that I was seeing the front of a
green LED sitting behind a windowed membrane. Now after looking closer,
it's just a colored legend, so the repair or replacement of the green LED
just got much easier ;-)

Although my scope appears to be operating quite close to specification,
there were no visible calibration stickers on the unit to gauge how long
since its last cal. Any recommendations for calibration of my scope
(people, place, labs)?

Tom



Re: 494P problems - ROM and 1st LO

Sparky99
 

Hi John,

Thanks for your very helpful reply - I investigated and found all the ROM's in sockets - although judging by the solder splashes on the pins this was not how it left the factory. ROM 1 is located on the GPIB board, and re-seating this still yields the same error. I'll investigate more, and also check ko4bb.com, and if it nothing else works see if I can get a replacement GPIB board.

Julian

Re: 494P problems - ROM and 1st LO

radioconnection@...