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Re: HP 130A restoration

 

I’ll have to look at the schematic again, as I didn’t notice the dependence (also) of 88V on the 300V supply. HP simplified their ‘scope power supplies subsequently, making one supply the standard for regulating all the others.?

Jeremy?


On Fri, May 3, 2024 at 3:55 AM Bepi via <pepicima=[email protected]> wrote:
Sorry a correction, by disconnecting the J9P interpanel connector I have disconnected the V33 heater so I could not have had the right voltage out anyway from the -150 supply, regardless I was getting around -165 on C140B. The dV across V34, 80+V, is about right.
Riconnecting J9P only and not J10P the 88V supply should not have worked regularly also since there the 300 V supply contribution is missing? , I am getting 31V instead of 88. Around 200V on the V28 and V29 plates. I tried to regulate the 150V supply and I could do this verya ccurately.

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