have a BE that has been working great. but, now, the A supply is messed up. When I put the test leads in the banana jacks the volt meter show 5 volts or whatever I have it set to. But when it is hooked up to the radio. It's like .028 volts.
The B supply volts are working fine. Where would be a great place to look? Thanks.

:have a BE that has been working great. but, now, the A supply is messed up. When I put the test leads in the banana jacks the volt meter show 5 volts or whatever I have it set to. But when it is hooked up to the radio. It's like .028 volts.
:The B supply volts are working fine. Where would be a great place to look? Thanks.
:
Make & model?

::have a BE that has been working great. but, now, the A supply is messed up. When I put the test leads in the banana jacks the volt meter show 5 volts or whatever I have it set to. But when it is hooked up to the radio. It's like .028 volts.
::The B supply volts are working fine. Where would be a great place to look? Thanks.
::
:Make & model?

Assuming the filament is DC, Check AC at input of rectifier for bad transformer. Check DC at output of rectifier for bad rectifier (my first guess. Does it have a filter choke? Check input and output of choke if in circuit. Agree with above post, a make and model would help a lot.
Lewis
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I think that The Amazing Kreskin retired some years ago. Us mere mortals need clues. If you can post a schematic of the BE, we might be able to offer suggestions beyond "try a different radio" or "buy a new battery eliminator".

:I think that The Amazing Kreskin retired some years ago. Us mere mortals need clues. If you can post a schematic of the BE, we might be able to offer suggestions beyond "try a different radio" or "buy a new battery eliminator".
:
Thanks!
it's a homemade BE that someone made.

I would start by checking the following in the battery eliminator:

1) Make sure there are no loose connections or bad solder joints inside it.

2) I would check to make sure the power transformer in the BE is putting out the correct voltage under its secondary winding.

3) Check for any leaky or bad capacitors in the BE. A leaky cap can drag down the voltage. Leaky capacitors can turn into resistors. Replace the bad caps with new ones.

4) Check for any resistors that have shifted or changed values and replace them if they are out of tolerance.

5) Check for a problem with the DC Rectifier. Replace any selenium type rectifiers.

:have a BE that has been working great. but, now, the A supply is messed up. When I put the test leads in the banana jacks the volt meter show 5 volts or whatever I have it set to. But when it is hooked up to the radio. It's like .028 volts.
:The B supply volts are working fine. Where would be a great place to look? Thanks.
:

Presented with a malfunctioning, home-made battery eliminator, without documentation and with your limited troubleshooting experience, I would probably scrap it and purchase a new one. www.tubesandmore.com has a kit. For a primo, bench-type unit, consider ARBE-III.

Good luck.

:Presented with a malfunctioning, home-made battery eliminator, without documentation and with your limited troubleshooting experience, I would probably scrap it and purchase a new one. www.tubesandmore.com has a kit. For a primo, bench-type unit, consider ARBE-III.
:
:Good luck.
:
Thanks to everyone who responded.