Zenith 10-S-130
Hank
1004) and have run into what I think are a couple of conflicts between
the circuit diagram and the socket voltages:
1. The screen grids of the 6L6 audio power tubes are fed directly
from the return from the speaker field which measures about 250
volts. (That source also feeds the plates of several other tubes
through various coils, and the voltages tested on those plates are
about 250 volts, corresponding to the listed socket voltages).
However, the listed socket voltages for the 6L6 screen grids are 120
volts. Either the circuit diagram is incorrect or the listed socket
voltages are incorrect.
2. On the 6H6 second detector, the the circuit diagram shows (and the
actual wiring corresponds) that the two plates are directly connected,
as are the two cathodes. Yet, the socket voltage chart shows
different voltages for the two cathodes (-2.5 on one and +.25 for the
other. I measure -2.5 on both. I assume the listed socket voltage
for pin 4 is incorrect since both cathodes are tied together and fed
from the same bias source on the candomm resistor.
Can someone with experience with this radio chassis please give me
advice on the 6L6 screen voltages and 6H6 cathode voltages?
Thank you.
John Goller, k9uwa
<8df9e49c-657d-471e...@h2g2000vbd.googlegroups.com>,
fogl...@montrose.net says...
>
>
>I am restoring a Zenithmodel 10-S-130 tombstone radio (chassis number
>1004) and have run into what I think are a couple of conflicts between
>the circuit diagram and the socket voltages:
>advice on the 6L6 screen voltages and 6H6 cathode voltages?
>
>Thank you.
Hank you are reading what should be correct voltages on both the 6L6
SGrids as well as on the 6H6 tube. Just some misprint on the Riders
Schematic. 250 volts is 250 volts.
and yes I have worked many times on 10s153 and 10s130 chassis.
John k9uwa
TwoMuttHeads
>
> Hank you are reading what should be correct voltages on both the 6L6
> SGrids as well as on the 6H6 tube. Just some misprint on the Riders
> Schematic. 250 volts is 250 volts.
>
> and yes I have worked many times on 10s153 and 10s130 chassis.
It's a typo on the original Zenith service manual. When I worked on
the 10 tuber I had, I realized 120 couldn't be right. I wonder how
many guys have tried to "fix" it?