Testing B+, Resistors, IF Cans

[cpacamper]

The filter caps are what stores energy and can have considerable voltage after it's turned off. The circuit will drain this energy quickly IF the tubes have had a chance to warm up. Turn it on and off immediately and the caps can store that energy for a LONG time. Clip your meter across the main filter cap and try it. Whenever you're about to reach inside a radio, it only takes a few seconds to check for voltage first... that's what I meant - if there's any doubt DON'T until you've checked for voltage.

Ok...in other words clip black meter lead to B-, red to positive of filter cap with set off to check stored voltage in the filter cap. If there is stored voltage, seems like I could turn unplugged set "on" to drain stored voltage?

Tom, you've helped connect the dots some for me, thanks a bunch

Fisherdude, thank you so much in advance for your time!

[Tom Bavis]

Originally Posted by cpacamper

If there is stored voltage, seems like I could turn unplugged set "on" to drain stored voltage?

No, you'll just have to wait... some recommend shorting it or discharging through a resistor, but I think that's risky.

In any radio, almost all the current is drawn by the tubes. They won't draw any current if the heaters are cold. So the power switch won't make any difference.

[cpacamper]

Originally Posted by Tom Bavis

No, you'll just have to wait... some recommend shorting it or discharging through a resistor, but I think that's risky.

In any radio, almost all the current is drawn by the tubes. They won't draw any current if the heaters are cold. So the power switch won't make any difference.

Thank you. Tom, you mention waiting for the filter to discharge on its own. How long to wait?