Grunow 654.. No Audio - Printable Version

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+--- Thread: Grunow 654.. No Audio (/showthread.php?tid=19287)

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Grunow 654.. No Audio - vecher - 11-28-2018

Just recapped.. turned on and at 100 Volts in draws 400 Ma..

B+ to ground is approx 310 Volts DC..

No audio.. When turning volume up and down get scratches.. No noticeable Hum..

Can scan schematic . Replaced the Bias cell with Watch battery.. Plus to Ground..

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RE: Grunow 654.. No Audio - vecher - 11-28-2018

OK Here are schematics..


[Image: https://farm5.staticflickr.com/4843/45183062455_87e75cc178_b.jpg]

[Image: https://farm5.staticflickr.com/4822/45183062985_cb021caf0e_b.jpg]


[Image: https://farm5.staticflickr.com/4828/45183063845_156164ee59_b.jpg]


OK  On second picture  The Black and Yellow leads were reversed.. I put them to match the schematic so the Resistance of field coil would be right.. Did I goof???

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RE: Grunow 654.. No Audio - morzh - 11-29-2018

When touching 2nd det cap or the output tube's grid, is there hum?
Are there voltages on plates?

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RE: Grunow 654.. No Audio - vecher - 11-29-2018

Ok  Stupid mistake again.. I forgot to install a resistor.. No voltage to OSC.. After install worked correctly..

Next Question  Where is the best spot to hook up my VTVM to measure the AVC Voltage?  Cannot get yo speaker voice coil to put on my output meter..

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