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Philco 604 Bias Cell
462ron
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#13

03-29-2018, 01:34 PM
Well look at it this way, for years they would use the center tap on the power transformer and a candohm resistor to ground to get negative bias for the audio output stage. Then later on, abandoned that by using a resistor in the cathode circuit giving the same results with less complexity. Give it a try, would be curious to know if it works!

Ron
Bendix 0626.      RCA 8BX5.   RCA T64
Philco 41-250.    Philco49-500
GE 201.             Philco 39-25
Motorola 61X13. Philco 46-42        Crosley 52TQ
Philco 37-116.    Philco 70
AK 35                Philco 46-350
Philco 620B.       Zenith Transoceanic B-600
Philco 60B.         Majestic 50
Philco 52-944.    AK 84
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Messages In This Thread
Philco 604 Bias Cell - by mboessen - 03-28-2018, 03:37 PM
RE: Philco 604 Bias Cell - by morzh - 03-28-2018, 05:02 PM
RE: Philco 604 Bias Cell - by mboessen - 03-28-2018, 08:28 PM
RE: Philco 604 Bias Cell - by PhilcoPhan1936 - 03-29-2018, 04:16 AM
RE: Philco 604 Bias Cell - by Arran - 03-29-2018, 05:12 AM
RE: Philco 604 Bias Cell - by David - 03-29-2018, 08:24 AM
RE: Philco 604 Bias Cell - by Radioroslyn - 03-29-2018, 08:44 AM
RE: Philco 604 Bias Cell - by mboessen - 03-29-2018, 09:24 AM
RE: Philco 604 Bias Cell - by 462ron - 03-29-2018, 10:12 AM
RE: Philco 604 Bias Cell - by morzh - 03-29-2018, 10:47 AM
RE: Philco 604 Bias Cell - by mboessen - 03-29-2018, 10:57 AM
RE: Philco 604 Bias Cell - by mboessen - 03-29-2018, 11:00 AM
RE: Philco 604 Bias Cell - by 462ron - 03-29-2018, 01:34 PM
RE: Philco 604 Bias Cell - by mboessen - 03-29-2018, 03:06 PM
RE: Philco 604 Bias Cell - by mboessen - 03-29-2018, 09:31 PM
RE: Philco 604 Bias Cell - by mboessen - 03-29-2018, 09:39 PM
RE: Philco 604 Bias Cell - by Radioroslyn - 03-29-2018, 10:14 PM
RE: Philco 604 Bias Cell - by 462ron - 03-29-2018, 10:30 PM
RE: Philco 604 Bias Cell - by Radioroslyn - 03-29-2018, 11:04 PM
RE: Philco 604 Bias Cell - by mboessen - 03-30-2018, 08:49 AM
RE: Philco 604 Bias Cell - by 462ron - 03-30-2018, 10:07 AM
RE: Philco 604 Bias Cell - by Radioroslyn - 03-30-2018, 12:22 PM
RE: Philco 604 Bias Cell - by mboessen - 03-30-2018, 07:41 PM
RE: Philco 604 Bias Cell - by Arran - 03-31-2018, 02:20 AM
RE: Philco 604 Bias Cell - by mboessen - 03-31-2018, 10:32 AM



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