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Old 12th Sep 2011, 7:45 pm   #7
Ed_Dinning
Dekatron
 
Join Date: Jan 2004
Location: Newcastle upon Tyne, Tyne & Wear, UK.
Posts: 8,171
Default Re: Linear Conchord/RSC A11 30 watt amp

Hi Bill, the bias supply can be derived from a resistor in the centre tap, but it is not a good design.
By far the best way is to use a small (say 5va) transformer to derive about 50 volts, even voltage doubling to get a higher output is OK, as the current requirement is so low.
If you want the Geloso circuit PM me with your e-mail and I'll send you a scan.

Ed
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