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Advice on ss rectification
Posted:
Tue Jan 08, 2008 6:07 pmby garyb
Hi, I am going to convert a pair of poseidon to ss rectification using the Sheldon Stokes cap boards.
I've done this conversion with the ST-70. Will diodes on the cap board + a CL90 on the primary be enough?
Any tips will be most welcome.
Gary
ss rect.?
Posted:
Wed Jan 09, 2008 5:58 amby hilldweller
Posted:
Wed Jan 09, 2008 6:17 amby Shannon Parks
The stock Poseidon circuit was designed to support the higher B+ voltages you'll see. Just make sure you set the bias as low as you can go before you change over, to prevent any runaway tubes before you get the bias set correctly. You <might> need to make adjustments to the bias circuit to get the tubes to bias low enough after the change, but I think you will need no changes.
Posted:
Wed Jan 09, 2008 7:55 amby Ty_Bower
You might want to think about mounting the diodes in a tube base, instead of soldering them to the SDS cap board. Then you can easily go back and forth between SS and tube rectified just by swapping your tube-base-diode gizmo for a 5AR4.
Posted:
Wed Jan 09, 2008 7:40 pmby garyb
Howdy, thanks for the help. The Poseidons are working fine with plenty of room for bias adjustment.
Cap board diodes and CL90s make for a low cost conversion that is easy to reverse if needed.
Again I want to thank everyone for your help; this site has been a great resource of info and will continue to be in the future.
Gary