Mainline voltage checks

kjwcb2 · 676

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Offline kjwcb2

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on: April 21, 2019, 07:41:38 AM
Finished my Mainline build today (sadly - what a lot of fun). Here are the final voltage checks with 230VAC with expected readings and my readings in brackets:
+275vDC on the Power Supply Board 275V (235V)
+6.3vDC on the Power Supply Board 6.3V (6.29V)
IA on the A side C4S Board 275V (239.6V)
IA on the B side C4S Board 275V (239)
Breg Regulator Board (both sides) 220V (218.9/218.8V)
-reg Regulator Board (both sides) 0V (0V)
Kreg Regulator Board (both sides) 8-1 2V (12.31/11.74V)

The 275VDC reading are all out. Could that be because I'm using 230VAC?


Offline Paul Birkeland

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Reply #1 on: April 21, 2019, 08:19:55 AM
This could move the B+ rail down, but fortunately the high voltage regulator still has plenty of voltage for proper operation.  If you wanted to be 100% certain, you could measure the DC voltage on both sides of the 270 ohm power supply resistor and we could tell you with absolute certainty. 

For what it's worth, the amp will run a bit cooler under these conditions.

-PB

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline kjwcb2

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Reply #2 on: April 22, 2019, 12:29:47 AM
Hi. The DC voltage on both sides of the 270 ohm power supply resistor is 13.68-13.70VDC.


Offline Paul Birkeland

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Reply #3 on: April 22, 2019, 05:31:41 AM
Yeah, that's about right on the money.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline kjwcb2

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Reply #4 on: April 22, 2019, 06:03:45 AM
Cool, thanks Paul.


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