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Re: HP 130A restoration


 

If that heater string is open, the +80 and -150 volt supplies should run wide open, because the control tubes would be nonconducting.

Hugh


On Thu, May 2, 2024 at 10:17?AM Jeremy Nichols via <jn6wfo=gmail.com@groups.io> wrote:
OK, I see that now—schematic is hard to read. Agree, looks like the two sections depend upon each other.?

Jeremy?


On Thu, May 2, 2024 at 8:00?AM factory via <bobradios11=gmail.com@groups.io> wrote:
Apparently V30 & V33 have their heaters fed from the +88V rail, in the series string of 8 valves, having only +31V is going to prevent the control valve/tubes from working in the -150V & +88V, seems these rails are dependant on each other.

David

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