Shunt reg voltages close, but a bit low...

Ivan303 · 231

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Offline Ivan303

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on: January 09, 2025, 04:17:43 PM
MJE 5731 A: .  Side A = 197V. Side B = 193 V

Close?

Low?

Any thoughts?


Offline Paul Birkeland

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Reply #1 on: January 09, 2025, 04:51:36 PM
How are your Kreg voltages?  These are a bit low, but pretty close.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Ivan303

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Reply #2 on: January 10, 2025, 03:05:55 AM
Kreg A = 1.83. Kreg B =1.84

Try a different 12AU7 and is if it makes a difference?


Offline Ivan303

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Reply #3 on: January 10, 2025, 03:49:52 AM
And who can resist the chance to do a bit of tube rolling?

Not me!

More like A=240V and B=233V or there abouts!

OK, long plate 12AU7 GB (Mullard) made Bugle Boy in a. Standard Brands box but with my handwriting saying checks OK (decades ago)..





Offline Paul Birkeland

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Reply #4 on: January 10, 2025, 04:44:33 AM
Those Kreg voltages are a bit low, but they will increase when you attach the rest of the circuit off the shunt regulator.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Ivan303

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Reply #5 on: January 10, 2025, 05:07:25 AM
Which may explain the HUGE variation in the voltages between tubes.

Will re-measure all of this when the rest of the circuit is in place.



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