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In Reply to: RE: High Performance Regulator ICs posted by sony6060 on January 29, 2017 at 08:41:56
you could use HI FREQ heating LOL jk look into filiment bias using Rod colman regulator there is no schematic but if you look hard enough you would be able to cobble together something similar
the 26 is a real bugger to get quiet
Lawrence
Follow Ups:
You can buy a Rod Coleman regulator for $40. How low noise is it? Is this the 'ticket' for 26 tubes?
What would happen, if you blew off all the complexity, and just used a simple second L/C section, as I do in all my B+ filters ? L1/C1/L2/C2.
How might that sound, if it were well implemented,m parts and design-wise ???
Jeff Medwin
Simple LC section using a 60mH choke and 44000uF capacitor results on .00 AC ripple in 9 volt bias. A 8 ohm resistor & 100uF cap at the filament is less than .001 AC ripple.
I do not have a AC ripple spec for a quiet running 26 tube, but .001 ripple is not good enough.
I have NOT used rod's regulators for the 26 tube but I will say when done right the output hum will be Uv level!
Lawrence
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