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If anyone needs a part let me know. Barry I could use the pots that deal with triggering and horizontal control their plastic knobs, A7 and A8 trigger boards. If you want contact me at.

Hi John : What a good answer to my question, I hope you don’t mind my response to your personal mail. I did not mention that I have JFETs instead of a matching pair of 12au6s in both

Barry, One is what I need. I am in the states on the east coast. Thanks. I am considering the multiplier also as a spare for my plain and B version. Mark

The one that I have is in excellent condition. Are you in the united states? Can you use just one? Barry

Hi Mark, I used one of them. I cut the clear plastic time mark rings off and replaced it with one that had a broken knob. Great fix! I seem to be better at the hardware restoration than the circuit

So did the first Tek portable solid state 'scopes beginning in 1966, which also used the ceramic strips. When I bought my Tek 453 about 1994 the roll was missing, but I already owned a spool of

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