[Heath] Results of experiment with reactivation of 572Bs in SB-200

[Kenneth G. Gordon]

On 8 Aug 2012 at 7:49, Wilson  Lamb wrote:

> Interesting.  Have you written up your reactivation procedure?

No. It is a very standard procedure I first learned at least 40 years ago out of 
an old Marine Radio Handbook. 

I first used it on a dozen, very flat, 304TLs I was given by a friend at the local 
Chemistry department. The tubes had been used in their Nuclear Magnetic 
Resonance machine as shunt regulators.

After reactivation, all of them acted like new tubes. I gave some to friends, 
and used several in a couple of amps another friend and I had built to use for 
AFMARS phone patching. We never wore one out, and those I had given to 
friends were still going strong several years later.

I recently used the same procedure on a pair of very weak Cetron 572Bs I 
had here. Those also act pretty much like new tubes now.

I'll write the procedure up and will post it to the list soon.

vy 73,

Ken W7EKB