Hello again.This is in regards to this little amp I am trying to get running that uses the 6SJ7 , 6L6 ,6AV6 and 5Y3. For some reason I am getting low voltage readouts .I am using an old Simpson volt/ohm meter (maybe there is something wrong with it).Anyways the AC filament voltage for the rectifier is about 5.2 volts but the AC for the 6L6 and 6SJ7 is reading about 3.2 volts. Is there a shorted winding(s) etc. maybe??

:Hello again.This is in regards to this little amp I am trying to get running that uses the 6SJ7 , 6L6 ,6AV6 and 5Y3. For some reason I am getting low voltage readouts .I am using an old Simpson volt/ohm meter (maybe there is something wrong with it).Anyways the AC filament voltage for the rectifier is about 5.2 volts but the AC for the 6L6 and 6SJ7 is reading about 3.2 volts. Is there a shorted winding(s) etc. maybe??
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Sometimes they had a center tap for the 6.3 volt winding that normally went to ground. Is it possible that the center tap was connected to the tube filaments by mistake?
Johnnysan-

::Hello again.This is in regards to this little amp I am trying to get running that uses the 6SJ7 , 6L6 ,6AV6 and 5Y3. For some reason I am getting low voltage readouts .I am using an old Simpson volt/ohm meter (maybe there is something wrong with it).Anyways the AC filament voltage for the rectifier is about 5.2 volts but the AC for the 6L6 and 6SJ7 is reading about 3.2 volts. Is there a shorted winding(s) etc. maybe??
::If there is a centre tap for filaments would that be 3 volts each side of the centre tap for a 6 volt tube or would there have to be 6 volts each side of centre tap like there is in high voltage windings? I was just measuring each socket (pin 2 and 7) to ground.Anyways the amp is working now but not very loud, have to use an equalizer to bring volume up,but hopefully the 6SJ7 will arrive soon and can put that in place of 6SS7 and maybe that will make all the difference.
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:Sometimes they had a center tap for the 6.3 volt winding that normally went to ground. Is it possible that the center tap was connected to the tube filaments by mistake?
:Johnnysan-
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:::Hello again.This is in regards to this little amp I am trying to get running that uses the 6SJ7 , 6L6 ,6AV6 and 5Y3. For some reason I am getting low voltage readouts .I am using an old Simpson volt/ohm meter (maybe there is something wrong with it).Anyways the AC filament voltage for the rectifier is about 5.2 volts but the AC for the 6L6 and 6SJ7 is reading about 3.2 volts. Is there a shorted winding(s) etc. maybe??
:::If there is a centre tap for filaments would that be 3 volts each side of the centre tap for a 6 volt tube or would there have to be 6 volts each side of centre tap like there is in high voltage windings? I was just measuring each socket (pin 2 and 7) to ground.Anyways the amp is working now but not very loud, have to use an equalizer to bring volume up,but hopefully the 6SJ7 will arrive soon and can put that in place of 6SS7 and maybe that will make all the difference.
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::Sometimes they had a center tap for the 6.3 volt winding that normally went to ground. Is it possible that the center tap was connected to the tube filaments by mistake?
::Johnnysan-
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::::Hello again.This is in regards to this little amp I am trying to get running that uses the 6SJ7 , 6L6 ,6AV6 and 5Y3. For some reason I am getting low voltage readouts .I am using an old Simpson volt/ohm meter (maybe there is something wrong with it).Anyways the AC filament voltage for the rectifier is about 5.2 volts but the AC for the 6L6 and 6SJ7 is reading about 3.2 volts. Is there a shorted winding(s) etc. maybe??
::::If there is a centre tap for filaments would that be 3 volts each side of the centre tap for a 6 volt tube or would there have to be 6 volts each side of centre tap like there is in high voltage windings? I was just measuring each socket (pin 2 and 7) to ground.Anyways the amp is working now but not very loud, have to use an equalizer to bring volume up,but hopefully the 6SJ7 will arrive soon and can put that in place of 6SS7 and maybe that will make all the difference.
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:::Sometimes they had a center tap for the 6.3 volt winding that normally went to ground. Is it possible that the center tap was connected to the tube filaments by mistake?
:::Johnnysan-

Try this if you doubt your meter: Look at the filaments. Do they look like other filaments that are known to be working properly on six Volts?
Lewis
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:Hello again.This is in regards to this little amp I am trying to get running that uses the 6SJ7 , 6L6 ,6AV6 and 5Y3. For some reason I am getting low voltage readouts .I am using an old Simpson volt/ohm meter (maybe there is something wrong with it).Anyways the AC filament voltage for the rectifier is about 5.2 volts but the AC for the 6L6 and 6SJ7 is reading about 3.2 volts. Is there a shorted winding(s) etc. maybe??

Chris,

I have seen sets where the center tap is tied to the chassis and the filaments lines were separate wires. I vaguely (as in don't put much stock in it) recall that it was for hum elimination.

Check the voltage across the two pins, not between each pin and the chassis/ground.

Richard

Assuming that the tubes are glowing, I assume that the filament voltage is correct. It is very rare that the 6.3 volt winding would fail.

Now how about the B+? You should show about the same high AC voltage on each plate of the 5Y3 socket (pins4 and 6)(whether or not it is plugged in, and DC to the filter capacitors when it is on board. (pins 2 and 8.) Of course, you should see the 5Y3 filament lit up, and if not, there is a problem.

I assume you changed the filter capacitors and all other paper capacitors out for modern equivalents already. If you have not, stop, and read up on it a bit.

All readings should be relative to the chassis B- which is conventional wiring for a transformer operating set. Be careful whilst measuring these.

Let us know what you find.

::Hello again.This is in regards to this little amp I am trying to get running that uses the 6SJ7 , 6L6 ,6AV6 and 5Y3. For some reason I am getting low voltage readouts .I am using an old Simpson volt/ohm meter (maybe there is something wrong with it).Anyways the AC filament voltage for the rectifier is about 5.2 volts but the AC for the 6L6 and 6SJ7 is reading about 3.2 volts. Is there a shorted winding(s) etc. maybe??
:
:Chris,
:
:I have seen sets where the center tap is tied to the chassis and the filaments lines were separate wires. I vaguely (as in don't put much stock in it) recall that it was for hum elimination.
:
:Check the voltage across the two pins, not between each pin and the chassis/ground.
:
:Richard
: