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After acquiring a TinySA Ultra which allows me to generate and analyze signals at higher frequencies than I've been able to, I decided to put my 7L13 back on the bench. To recap, with the 7L13 set

The vintageTEK museum has completed their 2025 calendar and is offering it for sale at the museum, on eBay, and on the Lulu bookstore. The museum is a 501C3 non-profit educational museum whose mission

I have a 1780R I want the Dallas chip(s) replaced with new chips like ones that can be done on a 2465B (fram/Ramtron/etc.). I do not have a reader or capacity to make the surface mount chip and board

Ed, I agree. I have been working on this SC502 for quite some time. This was the issue when I put It aside a year ago. Thanks for the comment.

I have the service manual and have restored 2 of these SC502s. I have everything I need to work on these except the experience. I appreciate the idea of a vertical amp issue as that was not obvious

When something that worked has been sitting for a long time it's a good idea to work over all of the controls while turned on - lots of times through all states. All switches, all pots, an so on.

Hi , Barry It looks to me as though the vertical deflection is all off screen , up or down is hard to guess but what you are seeing appears to be just electron scatter from the bean hitting the top

Can someone who knows about troubleshooting the SC502 please take a look at my 8 second screen capture video and offer opinions / suggestions. This is the same SC505 I was working on a year

For the 2N2148 replacement try MJ15004G -- readily available from Mouser etc. 2N2148 data sheet indicates that it was used as an audio amplifier output transistor.

Hey there. I have a decent collection of restored and working 500 series scopes. I think I'm missing only 2 or 3 of the plugins. Depending on what you have I may just take you up on the offer, sir.

I restore and repair them whenever I find one that is interesting and at a price I am willing to pay. I use them too for troubleshooting and monitoring transmitter outputs. I am working to keep them

Keith, I just took a quick look at the schematic. AFAICT, there is no electrical need for a germanium device there. It's a Ge device only because that was what was available at the time. Go ahead and

Just to clarify, I am referring to analog tube scopes only.

Hi John, Again, great offer! Got to looking and I am now wondering if you have a 2N2148 transistor? This is a T0-3 Germanium PNP power transistor. Tek p/n 151-0137-00 My Tek 575 desperately needs

Cleaned trim pots ? Visually OK or bad blanking? I would leave it alone Jon

You are very kind, thanks Mike! It is just love, pure love… ? And being retired with the possibility to do what you want with all old stuff is wonderful! Thanks again Gianni

Hi, is there any way to open and fix the 155-0064-00 ? Mine has one transistor input open Thanks Best regards

HI all, I have an older 7904 (SN < B260000) that I've been happily using, but decided to check Z-axis calibration. Step 4k is where I've hit a wall, so basically right out of the gate. Voltage on TP

Hello. Winter is on the horizon and so I have started to work on Tektronix projects. While doing that I came to the realization that I have thousands of parts from scopes that I have stripped for

Jeff, Are you doing this for trying to cosmetically match the original appearances as closely as possible, or for utility and maintenance? Either way I'd recommend first providing the basic safety