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

[Ivan303]

MJE 5731 A: .  Side A = 197V. Side B = 193 V

Close?

Low?

Any thoughts?

 

[Paul Birkeland]

How are your Kreg voltages?  These are a bit low, but pretty close.

 

[Ivan303]

Kreg A = 1.83. Kreg B =1.84

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

 

[Ivan303]

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)..

 

[Paul Birkeland]

Those Kreg voltages are a bit low, but they will increase when you attach the rest of the circuit off the shunt regulator.

 

[Ivan303]

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.