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December 07, 2021, 01:55:39 PM

Author Topic: High B+ voltage  (Read 99 times)

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Offline ADClosson

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High B+ voltage
« on: November 18, 2021, 07:55:46 AM »
I'm reading 325.5 VDC at the Raw B+ voltage test on page 38. It does seem to generally stabilize at 325.5, but it was starting to creep up when I unplugged the unit.

I've attached pictures of my build thus far. I'm not an experienced solderer, so I recognize that some/many of my connections might be suspect. In particular, I'm wondering if the diode/22 ohm resistor package might be one culprit.

Forgive the presence of paint on the underside of the chassis—sloppy, I know. I don't believe it's an issue, however, as it doesn't appear to affect ground connections.

Any suggestions? Thanks in advance.

Online Paul Birkeland

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Re: High B+ voltage
« Reply #1 on: November 18, 2021, 08:27:45 AM »
I would imagine your incoming AC line voltage is just slightly high.  Another possibility is that with no 6V6s in the tube sockets, I would expect that raw B+ to creep up a bit too.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline ADClosson

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Re: High B+ voltage
« Reply #2 on: November 18, 2021, 08:32:07 AM »
Thanks, Paul. The 6V6s were in fact installed. Should I proceed with the build and see how things turn out?

Online Paul Birkeland

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Re: High B+ voltage
« Reply #3 on: November 18, 2021, 08:38:17 AM »
Yes, I wouldn't be too worried about that.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline ADClosson

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Re: High B+ voltage
« Reply #4 on: November 18, 2021, 08:41:29 AM »
Ok, will do, thanks. The wall voltage is reading 124.5. Perhaps that is contributing to the issue.

Online Paul Birkeland

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Re: High B+ voltage
« Reply #5 on: November 18, 2021, 09:01:51 AM »
Yes, that will bump that voltage up a bit. 
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man