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Philco 623
Chuck Schwark
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#7

10-25-2012, 08:15 PM
According to the Production Change Notices for the 623, Run 4 (Oct. 1, 1935) had the 34 tube changed to the 1A4 and the 1st. IF transformer changed to increase sensitivity.
You your set is a later run version. Production went through 9 Run changes (component changes, additions, removal, etc.) during its production lifetime.

Service Bulletin No. 225 shows the 34 tube used initially.

Chuck
Chuck Schwark,
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Messages In This Thread
Philco 623 - by Bob Andersen - 10-25-2012, 10:51 AM
RE: Philco 623 - by Steve Davis - 10-25-2012, 12:57 PM
RE: Philco 623 - by jerryhawthorne - 10-25-2012, 04:47 PM
RE: Philco 623 - by Arran - 10-25-2012, 06:32 PM
RE: Philco 623 - by TA Forbes - 10-25-2012, 07:38 PM
RE: Philco 623 - by jerryhawthorne - 10-25-2012, 07:51 PM
RE: Philco 623 - by Chuck Schwark - 10-25-2012, 08:15 PM
RE: Philco 623 - by Chuck Schwark - 10-25-2012, 08:36 PM
RE: Philco 623 - by Bob Andersen - 10-25-2012, 08:36 PM
RE: Philco 623 - by Bob Andersen - 10-25-2012, 09:59 PM
RE: Philco 623 - by Chuck Schwark - 10-25-2012, 10:35 PM
RE: Philco 623 - by Bob Andersen - 10-25-2012, 10:45 PM
RE: Philco 623 - by Arran - 10-26-2012, 12:12 AM



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