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The voltage breakdown of the CRT heater winding, which can indeed be resolved by installation of a new 6.3 VAC filament transformer, is a not uncommon failure mode for many 500-series scopes.? But it

The LV transformer is good, the filaments are sourced from that transformer except for the 8393 Nuvister vert input amps. The HV transformer supplies the +250V, +85V, +100V, +12.6V, -100V & -3000V.?

My memory isn’t good on this, but 30 years ago I had to wire in a separate filament transformer for the CRT. I don’t recall the symptoms that led me to this fix. I used a junk box filament

I picked up a Tek 503 scope recently and decided to get it running. Found only one bad filter cap. But it appears the HV transformer T620 (pn# 120-199) is bad, all the voltages out of it gradually

Perhaps this may help someone in the future. I was contacted by a woman in Delaware whose father was a collector. I was given a lot of 8 scopes. Nothing incredible, mostly 4xx series. There was a 485

This showed up on my Pinterest feed and is from an NY Times Article: https://pin.it/1ovGjfD The system the woman is using is a LINC-8. The original Laboratory Instrument Computer (LINC) was

I'd cut and paste the Spanish text into an online Spanish-to-English translator, or, if the text is on a website, as you indicate, use Google translator on that page. DaveD KC0WJN

I see what you mean. In that case, I won't cloud the issue with any more suppositions. I'd be interested in seeing if you find any clarification on it. Thanks, Barry - N4BUQ

I added more photos. All the other positions match except ch1

I have a 495 spec analyzer with a phase lock failure. Theres a post on this cite in spanish that was a fix. Is there a translator on this cite? I havent explored other apps yet.

If that's the case, then it appears that agrees with CH1. The contacts are listed in 4123 order in the manual so it appears that is the position for CH1. Barry - N4BUQ

The one in the manual has 4 switch contacts because the first one is the power contact that is omitted in the mode select section. The first contact appears in the powersupply section. Ignore the 1st

The manual shows four switch contacts but the switch in the picture appears to have five. That seems incorrect. Thanks, Barry - N4BUQ

So my SC502's mode contact switch positions doesn't 100% match the ones in the manual. Ch1 switch config should be 01100 according to the manual. But for me, the actual switch contact is 01001. Can

Hi Glenn, As to U241, the internal gates are just used as inverters by tying the inputs together, so NAND or NOR makes no difference here. Each is a drop-in replacement for the other in this case; no

On Wed, May 1, 2024 at 06:54 PM, Glenn Little wrote: Hi Glenn, Unfortunately, replacing the "74S..." series logic gates is almost always a lottery win. In circuit design, normally, the 74S series is

For anyone wondering, it's fixed and the problem was caused by bad resistors in the focus circuit. R3-R4-R5 were all significantly out of spec. I replaced R1 and R2 while I was there. I added a

<clarkfoley@...> wrote: This panned out, thanks! Still passively looking for a K217 for my DSA602. > > >

If you're not in the area you can have it shipped, though if it is shipped, I cannot guarantee it's operation upon arrival. I will do my best to pack

Try VintageTek Museum Dave Wise