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Originally Posted by Geist
Hi All;
I have put in the two Resistors, And with both a Bulb and Variac, I have tried the unit.. The Output from the Transformer is fine, but I get really Low voltage, DC out.. From the Resistor Divider, So, I have Checked the voltage on the Rectifier tubes, still low.. Filaments show 3.4 Volts, after taking the Bulb out it was up to 4.7 volts..
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With the Bulb out and full line voltage on the primary, what voltage are you seeing on the 6.3V heater supply? Is it signifigantly plus or minus a nominal 6.3 VAC?
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...So, next, I will Dis-connect the wire from pin 8 and see what the Rectifiers put out by themselves,
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Leave the first filter cap in-circuit so your meter will see pure DC. Or else it will read the averaged-out value of the supply (ie., it will read low). This is assuming you're using an analog meter. A digital meter will go nuts on unfiltered ripple voltage.
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If it is still Low, then I know it is my Tubes.. And not Bad load, somewhere else.. But, If it is Higher, then, something in the Cap or Load or the diviver section then something is most likely wired wrong..
THANK YOU Marty
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With no load, it will probably read signifigantly higher than nominal. But be sure the first filter cap is rated for the higher voltage.
As an alternative to leaving the first filter cap in-circuit, you could jumper in a cap temporarily. Anywhere upward 10 mf or so would be plenty (with adequate voltage rating).