49-906 FM hum

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49-906 FM hum

Mondial
Phorum Expert

Posts: 1,114
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Joined: Feb 2013
City: Irvington, NY

08-11-2013, 11:54 AM

You might try changing the 14F8 converter tube. If it has heater to cathode leakage, then the AC voltage for the filament will FM modulate the oscillator, causing a hum. It could also be the 19T8 tube, since different diode sections are used for FM.

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Messages In This Thread

49-906 FM hum - by Eric Adams - 08-11-2013, 11:21 AM

RE: 49-906 FM hum - by Mondial - 08-11-2013, 11:54 AM

RE: 49-906 FM hum - by Eric Adams - 08-11-2013, 12:48 PM

RE: 49-906 FM hum - by Eric Adams - 08-11-2013, 02:16 PM

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