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Philco 623
Bob Andersen
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Posts: 802
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Joined: Dec 2008
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#9

10-25-2012, 09:36 PM
Thanks for all the great info guys Icon_thumbup Greater sensitivity sounds like a good thing to me Icon_smile
I like that 19 output stage too - push-pull in one tube. I really hope the output transformer is good unlike my 643.

Both this set and the 643 use 135, 67.5, 2, -3 and -7.5 volts.
I've already been noodling around with some designs using the LR8N3 HV regulator as shown in this article by Leigh Bassett.
(This post was last modified: 10-25-2012, 09:36 PM by Bob Andersen.)
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Messages In This Thread
Philco 623 - by Bob Andersen - 10-25-2012, 11:51 AM
RE: Philco 623 - by Steve Davis - 10-25-2012, 01:57 PM
RE: Philco 623 - by jerryhawthorne - 10-25-2012, 05:47 PM
RE: Philco 623 - by Arran - 10-25-2012, 07:32 PM
RE: Philco 623 - by TA Forbes - 10-25-2012, 08:38 PM
RE: Philco 623 - by jerryhawthorne - 10-25-2012, 08:51 PM
RE: Philco 623 - by Chuck Schwark - 10-25-2012, 09:15 PM
RE: Philco 623 - by Chuck Schwark - 10-25-2012, 09:36 PM
RE: Philco 623 - by Bob Andersen - 10-25-2012, 09:36 PM
RE: Philco 623 - by Bob Andersen - 10-25-2012, 10:59 PM
RE: Philco 623 - by Chuck Schwark - 10-25-2012, 11:35 PM
RE: Philco 623 - by Bob Andersen - 10-25-2012, 11:45 PM
RE: Philco 623 - by Arran - 10-26-2012, 01:12 AM



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