#91
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#92
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Riders is known for making mistakes in their service data, so I wouldn't put it past them to accidentally misdraw the schematics. |
#93
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Fine if the radio works like that, but the Riders schematic makes sense as shown. The right end of R11 has audio present and the left end becomes the filtered AVC voltage that would normally be feeding the grids of the RF and 6K7 IF amp.
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#94
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After finally deciphering the switching subnote below the main schematic, and correctly drawing it (finally in post# 83), R11 is not relevant to the discussion since it's not involved in the switch circuit.
The second gang of the switch is used for switching mixer (6A8) screen grid voltage on/off as shown: Last edited by old_coot88; 07-03-2020 at 11:35 PM. |
#95
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The schematic appears to be correct, from my understanding of the typical AVC circuit design. jr |
Audiokarma |
#96
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Now there's a real possibility.
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#97
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Either that or my set was a Friday special and was miswired from the factory but wasn't caught by Quality Control because it still worked that way...
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#98
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#99
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It would explain why this thing is acting up like it is.
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#100
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I would wire it per the schematic. You stated there was an issue with the AVC not working properly.
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Audiokarma |
#101
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I was thinking it was a problem with the AVC bypass cap being leaky but if you would of seen the condition of the original capacitors in this radio and the fact that it had almost all of it's original tubes in it yet, I'm beginning to wonder if this radio was a low hours set because of that wiring issue and AVC problem. |
#102
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Any update on jumping those two switch contacts per old_coot88 directions? Undoubtedly you have two short lengths of wire, resistor clippings, anything?
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#103
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Plus, I've been kind of taking a break on working on the radio part to try and work on the record player drawer trying to figure out how best to make some modern euro style drawer glides work with the record player drawer since the original drawer glides were broken and they were a custom job for this unit. |
#104
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How many “IF cans” do you see on the radio chassis?
What does the other end of r-11 appear to be connected to? jr |
#105
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The other side of R11 from what I could see looked like it attached to the tone control panel/circuit somewhere. |
Audiokarma |
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