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PT96 - low plate voltage
Carl Travis
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Posts: 205
Threads: 6
Joined: Jun 2006
City: Moundsville State, Province, Country: WV
#1

01-23-2010, 10:39 AM
When I received this radio, it had been recapped, but the rubber covered wiring had not been changed.
After changing the wire, I powered it up and resistor 27A&B got hot. I found a clipped component lead from the previous recap had shorted out to the adjacent tube socket. Also the volume control went bad. All other components seem to be within tolerances.
Now when I power it up, I measure 99V across cap 26A and only 40V across cap 26B.
The plate voltages are: 7A8 - 36V, 7B7 - 39V, 7C6 - 36V and 50L6 - 37V
Only the 7C6 voltage is close to the schematic:
http://www.nostalgiaair.org/PagesByModel...014179.pdf
I've double checked everything that I can think of, but definetly missed something.
Any suggestions?
Carl
Northern Panhandle, WV
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Messages In This Thread
PT96 - low plate voltage - by Carl Travis - 01-23-2010, 10:39 AM
Re: PT96 - low plate voltage - by 7estatdef - 01-23-2010, 09:46 PM
Re: PT96 - low plate voltage - by Carl Travis - 01-24-2010, 10:51 AM
Re: PT96 - low plate voltage - by codefox1 - 01-24-2010, 12:13 PM
Re: PT96 - low plate voltage - by Carl Travis - 01-25-2010, 11:42 AM
Re: PT96 - low plate voltage - by 7estatdef - 01-25-2010, 01:28 PM
Re: PT96 - low plate voltage - by codefox1 - 01-25-2010, 02:26 PM
Re: PT96 - low plate voltage - by Carl Travis - 01-27-2010, 12:14 PM
Re: PT96 - low plate voltage - by 7estatdef - 01-27-2010, 06:25 PM
Re: PT96 - low plate voltage - by 7estatdef - 01-27-2010, 07:04 PM
Re: PT96 - low plate voltage - by codefox1 - 01-27-2010, 08:50 PM



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