Mine is long dead and needs replacing. Anyone out there developed a workable go-around?
I don't want to re-invent the wheel..........
I can clip in a AAA cell and holder, but would rather use something button-like.

Thanks in advance.

Jim I have several Rogers radios and many of them hav bias cells .. What I have done is solder a 1.5 volt hearing aid battery in place and it seems to work for me.. I got the idea from others on the forum. Just make sure you get the polarity right,,the outside of the bias cell is negative..

Jim

You could replace the bias cell but may not need it? Later radios did away with bias cells for some circuits. These circuits use a cap coupling to the tube with high value grid resistor. Best to have model number so a schematic can be viewed.

This is the Silvertone farm set I got running last night (Home team won 9 to 1!)

http://www.nostalgiaair.org/PagesByMode ... 017342.pdf

Been experimenting - Seems to work OK with or w/o it. I jumped it w/ alligator clips - works OK. When I jump in a 1.2 VDC battery, the volume drops slightly but the background hash decreases (better signal/noise ratio?). Easier reception of SW signals.

I cleaned up the battery and holder clip contacts and measured 0.8V on the cell (2/3 it's value when new in 1938). Slid it back into the holder. No major difference between that and the 1.2V battery jumped in.

Maybe I'm trying to solve a problem that really isn't one..........?

PS: I LIKE the hearing aid battery idea! Glad someone has done that successfully.

In case you haven't found it, here's a good discussion of bias cells and a possible method of rejuvenating them:
http://www.philcorepairbench.com/biascell.htm

I rewired the circuit to add cathode bias, eliminating the cell. Can be done in some cases but not all.

Dave Wise

Most hearing aid batteries are zinc/air and not intended for long life. I use #13 in my H/A.

I would think a lithium coin cell is the best bet. You don't need 3.6V, but in my other systems (computer, ham transceiver, walkie-talkie), the memory batteries have lasted as long as 18 years.

Rich

Correct.... cathode bias eliminates the need for a bias battery.
Also, jump the cathode resistor with a 22uf cap to "steady" the bias voltage.

I've been doing that trick for years now.
Works for me!

Exactly. Once the seal is removed, they will self deplete in weeks.

Pete