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Old 11th Sep 2011, 10:13 pm   #5
ms660
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Join Date: Apr 2011
Location: Cornwall, UK.
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Default Re: Linear Conchord/RSC A11 30 watt amp

Quote:
Originally Posted by maninashed View Post
Thanks lads, Ed, I've got a mains tx that will put 450 or so on the anodes, the 807 will take a high voltage. What I need most of all, is the biasing arrangement using a standard type mains tx, ie 450-0-450 6.3 5.0, I'm aware that the concord used a standard tx but the centre tap was lifted from ground to give the bias for the 807. Terry, if you could send me the schematic for that amp I would appreciate it, I can pm you with contact details. Many thanks.
Bill
You might might need to ensure a decent bias regulation if deriving -Ve the bias supply from the centre tap of the HT transformer as the HT current draw will vary a lot with push pull O/P as the valves swing between low and high current draw.

Hope this is of some use.

Lawrence.
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