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Antique Radio Technical Forum
Screen Voltage on Canadain RCA 97K-1

Posted by Brian on 02/14/2010 20:46

:Thanks again.
:It is still the original speaker intact, and all electrolytics are new. Stations come in good with lots of volume, nice tone, even a few shortwave stations too. That capacitor is deeply buried so I will measure resistors first.
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::Sir Brian. . . . . .
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::Ab-so -rootley, on the possibility of C38 leaking and pulling down the Sub B+ level a bit.
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::What you might try is to monitor the Sub B+ at the origin of its tap off at voltage divider bridge of R14-R17.
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::Then you unplug 6K8 and 6K7 tubes to see what the sub B+ rises up to without loading . . . Then plug in one tube at a time and recheck the voltage level. One of those individual tubes will have loaded and pulled the voltage down a wee bit more than the other.
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::I am thinking that it will be ~ 12 ma consumption for the 6K8 and ~11 ma for the 6K7. Seems like C38 is over to the side of the chassis and down under a lip.
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::That C38 would have to be seriously leaky down in the k's of resistance to be effecting us on that degree of a voltage drop.
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::The potential other thing aparrent on that supply line, is leakage within the the C41---5 ufd filter , which we hope that you have already replaced with a good unit.
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::You did not make any reference to the 1k power res sub for a speaker field coil, so I guess that situation was on somebody elses set. And, you also still have the original speaker in your unit, and no one has subbed in a speaker with a lower value of field coil reisistance / inductance.
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::BTW have you ever heard stations picked on this radio ? That initially being even before you started changing parts, considering that you made an initial g r a d u a l power up, thru a Variac, to see if there were initially any power electrolytic filter issues in the unit.
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::2 questions included.
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::Standing by . . .
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::73's de Edd
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::RCA 97K . . . series . . . SCHEMATIC:
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::IPAddress: ***.225.163.12
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:IPAddress: ***.103.184.76

IPAddress: ***.14.121.16

Screen Voltage on Canadain RCA 97K-1 
Brian 02/07/2010 20:35 
Thomas Dermody 02/07/2010 23:55 
Thomas Dermody 02/08/2010 00:01 
Brian 02/08/2010 07:32 
Edd 02/08/2010 20:33 
Brian 02/09/2010 11:35 
Edd 02/10/2010 12:47 
Brian 02/10/2010 13:49 
Brian 02/14/2010 20:46 
Brian 02/14/2010 20:50 
Edd 02/15/2010 06:33 

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