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In Reply to: RE: G2 regulator for SE EL84 amp posted by DAK on June 27, 2015 at 22:00:42
0A2 + 0B2 stack. Suppress noise with a single 0.068 μF. cap. across both gas discharge tubes. Too big a cap. results in a relaxation oscillator. :>(
Eli D.
Follow Ups:
Hi, Eli, problem is I am using the original power trans from the amp and I am not sure it has the capability to supply much extra current. In your proposed application what are the voltage and current requirements? thank you, Dak
I think VR tubes have a 5ma. minimum.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
5 mA. minimum is correct. Save the following 3 documents on your hard drive.
http://www.mif.pg.gda.pl/homepages/frank/sheets/141/g/GL874.pdf
http://www.mif.pg.gda.pl/homepages/frank/sheets/127/0/0A2.pdf
http://www.mif.pg.gda.pl/homepages/frank/sheets/127/0/0B2.pdf
A look at a 6BQ5 data sheet shows g2 current "idling" at 5.5 mA. and max. draw as 10 mA. Setting the current regulating resistor for 26 mA. seems right. Decide if the PSU can take the added 6 mA., when a peak demand occurs.
Eli D.
.
OK, the ice is very thin. A heatsinked LR8 in each channel would be a solution. The total added draw for the 2 ICs is 1 mA.
Eli D.
I am very interested in trying this, but, I am not very good at turning a manufacturer's white paper into a workable solution. Do you have a "recipe" that I can follow for my SE amp? I guess removing the current G2 supply from the B+ will gain back some power for using in the LR8, so , I won't be upsetting the apple cart. Thank you for your help, cheers, Dak
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