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Low voltage and oscillation
#7

Thanks Chas
Sorry I didn't answer the questions in your first post but frustration took over and I walked away for a little while.  The transformer does not have any shorts.  I had the radio on for more than an hour while checking voltages and poking around and the tran. got a little over room temp.  Warm to the touch.
 There is no Candohm in this radio and I'm still not sure how to check if a cap or resistor is leaking to chassis.  Something I have still got to learn.
After checking voltages with my vtvm,( which is an Eico 232)it was a little higher but still below the specified voltage.  Recommended 180 v dc plate voltage and with the vtvm I got 156 v.  This difference was consistent thru the set.  I also have a Fluke with 1000ohm/volt.
 I obtained a 40-180 chassis which is similar to the 40-190. I checked my wiring and the installation of components to it and they all seem right.  The only thing changed in the -180 were the Ecaps and 2 wax caps.
  As far as checking the grounding everything is riveted as far as chassis grounds.  I went thru and tried to get a connection on all the ground rivets with a screwdriver while the set was on and got nothing.
  So my next test is to check my current consumption on the B circuit using your guidelines.
  My prowess is waning along with my confidence but I'll keep trying.

Thanks again
Dick


Messages In This Thread
Low voltage and oscillation - by madsowry - 03-11-2019, 06:01 PM
RE: Low voltage and oscillation - by morzh - 03-11-2019, 07:52 PM
RE: Low voltage and oscillation - by madsowry - 03-11-2019, 09:42 PM
RE: Low voltage and oscillation - by Chas - 03-12-2019, 10:58 AM
RE: Low voltage and oscillation - by madsowry - 03-12-2019, 04:26 PM
RE: Low voltage and oscillation - by Chas - 03-12-2019, 05:08 PM
RE: Low voltage and oscillation - by madsowry - 03-12-2019, 10:14 PM



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