Dumont RA 113 B5 Find

[Penthode]

My 19AP4 was a rebuilt tube with an October 1964 label on it. I therefore had hope that it was good.

When I got the set home and tested it with my BK467, there was absolutely no emission. I tried coaxing it back to life and the emission improved slightly but was miserably low. I then gave the tube a rejuvenation burst.

Lo and behold the emission came right up and is now excellent, even on life test. This was a few weeks ago and I tested it again and the emission remains excellent.

Consider that the tube has been sitting dorment for probably forty years. I think it just needs to be woken up.

[Kevin Kuehn]

Originally Posted by Penthode

Consider that the tube has been sitting dorment for probably forty years. I think it just needs to be woken up.

This one is now almost up to the bad/good line, but it's still on 8v. It did not respond to Rejuv 1. Is it bad to let it cook on 8v for a day? I figure no worse that putting a brightener on it.

VDC actually shows 17BP4's in stock, most likely in error. I've inquired about other tubes and they're not really there.

http://vdc.mybisi.com/product/17bp4