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Grundig Balance Control - Printable Version

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Grundig Balance Control - RodB - 03-19-2022

Does anyone have a secret technique for freeing up a frozen Grundig Balance Control?

RE: Grundig Balance Control - morzh - 03-19-2022

Rod


There are many Grundigs, so if you show a photo, maybe we know what you are referring to.

RE: Grundig Balance Control - RodB - 03-20-2022

Glad you asked, Mike. I'm working on a Grundig SO 121 U/a balance control. It's a 1960 AM FM Phonograph stereo but the radio is mono only. The balance/volume is a dual control. Center shaft is volume and works fine. Outer shaft is balance and doesn't move. Being a Grundig, the controls are pretty much sealed but I'm spraying cleaner on it. I think it's the shaft that is the culprit. The last Grundig I had was the same and it came loose with alcohol, which I will try next. Getting alcohol into the sealed control is difficult. Any suggestions or comments are appreciated.

   

RE: Grundig Balance Control - mikethedruid - 03-20-2022

Get a cheap oil squirt can from Harbor Freight, and put some Marvel Mystery Oil in it. With the control facing upward, squirt a drop on several spots around the circumference, and wipe off excess. Then gently keep trying to rock the control back and forth. It should break loose. If not, the next step is a little squirt of PB Blaster, followed by the same routine.

RE: Grundig Balance Control - morzh - 03-20-2022

Yes, and I am sure all the anti-seizing products, PB Blaster, Kroil, even WD40 will probably do the same job.

And you also could use heat, some time later after applying the oil. Gently, like from a Milwaukee gun on the Medium setting. heat - work, heat - work.

RE: Grundig Balance Control - RodB - 03-20-2022

Thanks Mike and Mike for the tips. I'll try the Mystery Oil and some heat. I'm wondering if there's some old lubricant in there that has hardened.

RE: Grundig Balance Control - RodB - 03-21-2022

Tried the heat/lubricant and it works. At first, when I removed the heat, it locked up again. I just had to keep the routine going until it was flushed out.

RE: Grundig Balance Control - morzh - 03-24-2022

Rod

Yes so I thought also - seized lubricant.

At some point if possible, you could open it and cleane it for real.