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Not sure if this problem is on the vertical or horizontal amp, but the trouble-shooting should be similar. First, the balance pot: on early s/n's this was 5k, changed to 10k on s/n 6630 up . 100k

Yes that has been the only one so far. As soon as I replaced it, the ‘scope then worked fine so I can say for sure it ‘s bad.

Barry, I can use the v/div knobs. Mark

Hi Adam, Yes, I had the wrong post in my brain buffer. Thanks for re-aligning my neurons! -- Cheers, Tom -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 420 Via Palou Mall Stanford University Stanford,

Well, at least it's alive. The power supplies are all up and it has a sharp bright blue trace, but obvious problems in the vertical system and readout so far. I'll have to work on it hopefully

Tom, I had that same thought when seeing Barry Breaux's post this morning about a 465 he's parting out. I wonder if that's the message you're thinking

Hi Jeff, How did you determine that those transistors were bad? If you used one of those do-it-all component testers, check again with a DMM or curve tracer. The testers can break down the

Perfect! I'll order some of these transistors. Thanks for sharing the info, Mark! Jeffrey

Jeffrey, A KSP10BU will replace the bad transistor. The pinout is BEC. This transistor will replace others as well. The 0367 is an example. Mark

Hi everyone, My 575 curve tracer’s DC balance on front panel won’t calibrate properly. I am following the calibration procedures in the manual. The dot won’t center, with the pot range

I'm glad to share that I've successfully identified the culprit: transistor Q364. I tracked it down by shorting the bases of transistors on the upper and lower rails, block by block, starting with the

I'm on my last 7K repair project, another 7904. This one has been a PITA with a failure inside the power supply. I had gotten it down to suspecting something in the HV supply, and set it aside a while

They’re not in fact Dzus (yes sorry my incorrect prior spelling) - as those indeed rely on a fixed receptacle, whereas the ones on the 130 have ‘ears’ that when rotated slide being the edge of

Well, those are expensive birds, mostly because of the hybrid frontends. But you still can buy a non-functional one for $200 - $500. A typical 8x00 series plugin contains a hybrid frontend where the

I'm pretty sure he has a 100,000 m^2 building with a 1,000 elv...err...electronic engineers, graphic designers, etc., working for him. "Retirement" just can't explain this feat. Seriously, hats off

Greetings from Louisiana! I have 3 465's and I am parting one out. If anyone needs a part let me know. I pulled all the transistors, they are in sockets. I had about 6 transistors that were bad. I

Greetings from Louisiana! Working on a Tektronics SC503 that still has a few issues. I got the power supplies sorted out and I am able to finally see a trace on the CRT. Its bright and beautiful and

Gianni, This is truly the missing manual for my DSA 602. Thank you, George KD6NEW

Well, one just sold on epay for approximately $5K. The '04 is a TDR sampler. If you just want a sampler, I suggest you try for the 80E02. The bandwidth is 12.5 GHz. (TDR samplers will be more

Greetings, I have a TEK 575 curve tracer and on page 4-2 of the service section of the manual it states: “It is advisable that you have a stock of solder containing about 3% silver if you