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Hello Just joined this forum. I am Paul from the UK. I am a EX TV/Audio/Video engineer now working in the broadcast industry. I? restore vintage color TV sets from the 1970s and 80s in my spare time.

I would like to thank everyone for the interest! It looks like I have found a good home for the full lot, however IF that changes I'll email every one to let you know what I have available Thank you

I could be interested in a 7834 PSU should it come to parting out. Further talks to be conducted off-forum.

Eric - Is the 7904 an A version or a straight 7904 ? I would be intereted in the 7B92A and possibly the 7A19 and the 7B15. Lets talk off line? Cheers! Bruce Quoting Eric <ericsp@...>:

Don I am intrested in some of the 79xx equipment Please contact me off list. Eric [email protected]> wrote:

It would seem that I have bit off more than I can chew and have far more projects than I can keep up with or have time for. I truly do not wish to ship, certainly not the main frames primarily due to

For those following along: The jumper (J2726) that connects connect the PSU board to the CRT can be found if you continue following the red cable.. Unlike the other jumpers on the PSU board, it is not

Thanks again for the earlier info... I'm now at another crossroad in troubleshooting my 2247A... How do you fully remove the PSU board from the chassis? The screws to be removed and most jumpers that

It is a switching power supply, so anything after the input caps after the rectifier should be low ESR. especially after the transformer.

Thanks! This is exactly the kind of info I was hoping for when I posted my issue. Other than the diode replacement info, is there anything special about the caps that may need replacement? low-ESR,

If the 'scope has been used regularly, it is unlikely a PSU cap will have dried up. But, a shorted cap, in the 'scope or PSU could indeed cause such issues.? As could any number of other things

It looks like your power supply is trying to start but is folding back probably due to a short or overload on one of the power rails. Could be be a shorted cap. Perhaps a good time to recap that power

It looks like your power supply is trying to start but is folding back probably due to a short or overload on one of the power rails. Could be be a shorted cap. Perhaps a good time to recap that power

Yes, correct, it’s not getting as far as providing the self-test results via the trigger LEDs. I plan to open it up for the first time and was hoping there was an experienced person who could say

Chris - Sounds like power supply issues. Suggest checking capacitors on the power supply as well as looking for shorts to ground on the various voltage rails. Some scopes use the various front panel

I need to follow this thread.. my 2247A was purchased new by me when they were first introduced and though now surrounded by faster 7000 series, it remains my primary day to day scope. I dread the day

My 2247A just failed on me and am looking for some initial thoughts on the likely culprit. After pressing the on/off button, it immediately goes into a repetitive cycle of clicking (like relays

If you have a 7904 - keep the power supply - check to be sure the are similar, there are differences between 7904 and 7904A. A spare supply is a REALLY good thing to have. Cheers! Bruce Quoting "G

I want to thank everyone for their input.? I posted the following on the "non-2" list and wanted to share it here too. Replacing the CRT is probably outside of the time and energy I have to devote to

The TDS series are already digital 'scopes, the A/D and sampling conversions are already done for you. Try doing a FPGA analogue vector to raster conversion, that can take 500MHz+ (1GHZ for the 7104