Dumont RA 113 B5 Find - Page 2 - Videokarma.org TV - Video

Penthode · #1 10-21-2011, 03:29 PM

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 · #2 10-21-2011, 04:06 PM

Quote:

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

holmesuser01 · #3 10-21-2011, 07:03 PM

I'd sure be careful using a rejuvinator on an old tube so quickly. One shot can destroy a cathode. In my case, the rejuvination is the last resort. Let it cook for awhile.

old_coot88 · #4 10-22-2011, 02:47 AM

Quote:

Originally Posted by holmesuser01

I'd sure be careful using a rejuvinator on an old tube so quickly. One shot can destroy a cathode. In my case, the rejuvination is the last resort. Let it cook for awhile.

Indeed. 110% spot on. With a 'juvination nine times out of ten the tube will be nice and bright for a week or two then go completely flat even with a brightener. Whereas a brightener alone will maintain it much longer.

Kevin Kuehn · #5 11-21-2011, 07:50 PM

Slowly poking away at this, I've been on a knob hunt for the last few weeks…

I while back I cleaned up the knobs that came with the set and realized that I had three possibly original to the set.

Then I received a few more Dumont knobs from Mike Koste (Gobs Of Knobs). Plus today I got another lead on a couple more knobs that should complete the controls.

Does anyone know of a way to remove the "brights" from these before soaking them in 409 cleaner? It sure would be nice to remove them to simplify polishing and re lacquer.

Phil Nelson · #6 11-22-2011, 04:52 PM

Most brights seem to be glued on. Unless they're already loose, trying to pry them out might do more harm than good.

Phil Nelson

Kevin Kuehn · #7 11-22-2011, 06:07 PM

Quote:

Originally Posted by Phil Nelson

Most brights seem to be glued on. Unless they're already loose, trying to pry them out might do more harm than good.

Phil Nelson

Yeh, plus I think these are pressed in too. I'm just paranoid that water will get under and then not being able to dry out, but I'll try not to worry about it.

wa2ise · #8 11-23-2011, 01:26 PM

Quote:

Originally Posted by Kevin Kuehn

Anyone know of a spare right hand door, and a set of knobs?

No, but on or more of those on your set look like Admiral knobs. Someone here may need them, so when you do get the correct knobs, please save the old knobs.

Kevin Kuehn · #9 11-23-2011, 07:13 PM

If someone wants the Admiral knobs they're more than welcome to them. I have a couple more around too.

47'Plymouth · #10 11-25-2011, 01:03 PM

Denture cleaner tablets work great on crusty dirty knobs and other plastic parts try this tip in the near future...if it cleans your choppers it will certainly clean your knobs

kvflyer · #11 11-25-2011, 01:08 PM

And everyone knows that you gotta have clean knobs

holmesuser01 · #12 11-25-2011, 01:22 PM

Yes, knobs that are clean. Nothing like dirty knobs.