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

[Kenneth G. Gordon]

On 8 Aug 2012 at 9:29, G3OOU at aol.com wrote:

> Hi Ken

Hello, Bob. Nice to hear from you again. :-)
 
> Thanks for your explanatory email on 572Bs made in China. I wondered
> if the heater current in those is the same as the originals or lower? 

Heater current appears to be identical with the originals, but I have not yet 
checked that to be certain.
 
> This all shows that skimping on the design and manufacture for the
> sake of  a dollar or two is a really false economy.

Absolutely correct. They can sell a pair of "572Bs" every year to any users 
who uses his amp regularly. That seems to me to be false "economy". I 
would think that with all the dual-572B amps there are in the world, they 
could make MORE money by offering tubes that were reliable and of good 
quality.

If higher quality more reliable tubes were available, more users would be 
resurrecting and using older amps, and building amps which used them.

As it is now, we either have to put up with crappy unreliable tubes, or go to 
something more up-to-date.

As soon as I have finished my modification to my SB-200, I'll let others know 
the details.

vy 73, Bob.

Ken W7EKB