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I have a Ming-Da MC7-R preamp which I barely use due to loose sockets for 12AU7 and especially 12AX7 tubes (I attach the picture). Sometimes it plays but sometimes one channel disappears due to loose contacts on the 12AX7 socket(s). I such a case, I have to rock a tube which produces a noisy sound but restores the contact for some time.
I wrote somewhere that some people tighten the sockets somehow (perhaps, using tooh picks).
Can I do the same or cure this problem in a different way, judging by the structure of the socket shown in picture?
Many thanks in advance.
Follow Ups:
I concur with TK, the best choice is to replace all the sockets, if they look like the one shown (gold plated pins, porcelain socket body). Older amphenol sockets are actually superior because of better metallurgy, but they don't look as sexy. Before I knew any better, I used several such (porcelain) sockets in homebrew equipment. So far, I have been lucky as none have failed.
Thanks, I will try to get amphenol sockets locally.
I was not aware that amphenol was still in production of tube sockets. If you are going to purchase vintage, make sure they are NOS and make sure you have pictures. I used to purchase them, and when they come in corroded or a barn find, it is just useless.
On the other hand, as (I think) someone else suggested, Belton sockets are really good. They grip pins very tightly.
Be aware, some (most) amphenol, Belton, etc are larger than the porcelain ones and will not fit directly. Be sure to check the specs of the actual diameter of the socket first.
Dental picks are the tools you are thinking of. But I'm not sure how easy it will be to access those porcelain type sockets that are recessed in your preamp.
Wedging the pick between the contact and inner wall of the porcelain hole will force them to tighten up.
As suggested by another member, replacing is best if they continue to loosen.
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
Tnis is just one of the many problems people experience with Chinese audio products. I would look at Belton to see if they have sockets you can install in place of that porcelain junk.
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