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BTW, the frequency is exactly 23,600 Hz according to my 7D15. If it's of any use.

Alright, its a match! I set the scope to display the Left Vertical Plugin (set to ground so that it shows a straight line) while triggering on the Right Vert Plugin that had a 10X probe next to the

Harvey, Will give this a try. Thanks, RB

I seem to have lost control of the web interface for a moment. Please ignore my earlier "response" which only repeats what I sent earlier. Raymond

Thanks for responding, Dave. As I said, I'm going to try at SRS but seeing only SM's for their equipment that stop after the parts list, I wasn't hopeful. I'll report back what their response is.

If someone can recommend a place to seek help, please do. As it is, I can find different versions of a Service Manual with component lists but no schematics. All SM's for SRS equipment from the same

Ask Stanford directly - AFAIK they have always provided Service Manuals with schematics and still do. Dave

Please don't continually re-edit your post - those of us who receive posts by email (most of us) set the same post over and over with minor edits. Thanks Dave

Hi Tomas, The HV transformer works at the SMPS frequency. Hence in theory you cannot distinguish yet whether the intensity ripple originates from the HV or from LV ripple entering the Z-axis

If your 7L13 is anything like my 7L12, it should have a 'phase lock' switch which locks the 1st LO to a multiple of some frequency (about 700kHz, I think) for spans of less than 200kHz/div. This works

A high voltage probe could show you 25 KHZ ripple on the HV lines. That, or some bypass capacitors failing would be a start. You could take a probe, place it near the HVPSU to get a signal, then tri

DSO works. Since the chip is one way only, you look at the schematic and see where the offending pin is supposed to be output to the bus. Let's assume it's D0, then on the input, you have a steady

I finally succeeded in breathing life back into my Tek 634 display today but, as it turned out, only briefly. Thanks to google, an expired ebay link and a really helpful chap in the US of A I got my

I just checked and sadly it does not. The pattern stays exactly the same!

Hi Barry, Deal done ! I will sent you right now an e-mail off the group for personal information. Please let me know if you do not receive it. Thank you Victor

Does the pattern disappear if you turn the read out intensity to zero? Roger

Ever since I got my 7704A I could always see a running dot-pattern on the trace that would go to the right or left, depending on my horizontal speed setting. I'ts most visible in the 100uS/div and

Harvey, Thanks for your suggestions. I have a DSO (but none of the other gear you mention) which may be helpful, but perhaps easier just to change the IC. RB

How about a condensate drain valve? Do you have that to let water out the bottom of the compressor shell/tank? A small refrigeration compressor from a water cooler might be a good size for venturi

Hi Victor, Shipping will be $14 and $15 for the three boards so $29 total. Let me know if you're still interested. You can reply off group if you'd like. Thanks, Barry - N4BUQ