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#32
12-25-2007, 02:06 PM
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Meanwhile I have made a test-assembly for the AGC-control and attached it to the set. It lasts only some minutes. Your hint, peverett, was dead right. The set is working again. Since the AGC control has only few parts, I will make a new one and put it in the set. This seems to be the safer way than disassembling/re-assembling the control assembly and eventually to have broken metal tabs.
This is another example how good Audiokarma is! For myself I would never think of the AGC control assembly as the reason for the fault. Merry Christmas! - Eckhard 
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#33
12-25-2007, 02:22 PM
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Good work. Yours is an older model than mine. I was able to disassemle-re-assemble the controls on mine without breaking the metal tabs, but it was time consuming and tedious.
One of the advantages of making a new one with the controls seperate is that the boost voltage is no longer near the agc area. One thing that I have found with my Portacolor is that it does not work well on cable. I think that the tuner selectivity is not good enougn.
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#34
12-25-2007, 03:52 PM
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Here is a photo of the new AGC control. I hope that it will not suffer from the heat of the line output tube. I have cut the conducting paths for the original AGC control assembly for ground and +270V to prevent any trouble from booster voltage. This new assembly can easily be removed if I decided to re-activate the original one.
My Portacolor has a time stamp of 4-21-1967. It did not have the label Portacolor, but only "Color". The model is M21THW-1. - Eckhard
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Linear Mode
