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Grunow 654.. No Audio
vecher
Phorum Expert
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Posts: 933
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Joined: Mar 2015
City: Lansdale State, Province, Country: PA
#1

11-28-2018, 06:04 PM
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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vecher
Phorum Expert
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Posts: 933
Threads: 140
Joined: Mar 2015
City: Lansdale State, Province, Country: PA
#2

11-28-2018, 06:28 PM
OK Here are schematics..


[Image: https://farm5.staticflickr.com/4843/4518...c178_b.jpg]

[Image: https://farm5.staticflickr.com/4822/4518...af0e_b.jpg]


[Image: https://farm5.staticflickr.com/4828/4518...ee59_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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(This post was last modified: 11-28-2018, 06:30 PM by vecher.)
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morzh
Odobenus rosmarus
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City: Jackson, NJ
#3

11-29-2018, 03:02 PM
When touching 2nd det cap or the output tube's grid, is there hum?
Are there voltages on plates?
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
(This post was last modified: 11-29-2018, 03:06 PM by morzh.)
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vecher
Phorum Expert
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Posts: 933
Threads: 140
Joined: Mar 2015
City: Lansdale State, Province, Country: PA
#4

11-29-2018, 05:05 PM
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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(This post was last modified: 11-29-2018, 05:06 PM by vecher.)
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  1. The PHILCO Phorum
  2. Various and Sundry Categories
  3. Other Radios (Non-Philco)