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If all else fails...

Posted by Jonesy (A) on September 18, 2015 at 10:56:44

In Reply to: RE: Counterpoint 3.1 tube layout posted by f1jim@yahoo.com on September 17, 2015 at 15:00:04:

I have an SA5. I also have the manual somewhere, but what I do is this. It's a little unorthodox, but it does the trick.

This is based on most tubes being somewhat micro-phonic. Even a tiny bit.

You're system will have to be turned on.

With the cover off, set the unit to phono stage. Using a pencil with an eraser end, gently tap the tubes (using the eraser end) and you should hear a slight "thump" come through your left or right speaker. This will identify your left and right phono input tubes. The tube that makes no noise would be the line stage. To be sure, try again with the selector set to line stage and repeat the tapping. Note, you may have to adjust the volume up as needed while doing the tapping of the tubes.

I don't believe any signal tube is micro-phonically impervious to the gentle tapping. Of course be careful of the high voltages and not touch anything else in there.

Hope this works for you.

Cheers!

Jonesy

P.S. If you don't have a pencil with eraser, use anything similar, so long as it is not a conductive material or hard enough that it could break the tube.




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