[Heathkit] RE: SB-200

[Peter Markavage]

Wasn't there some issue with using the Chinese 572B's in the horizontal
position rather than in the vertical position as is in most amplifiers?
Something to do with possible element sag under high heat/high current
conditions or am I dreaming.

Pete, wa2cwa

On Wed, 26 Jul 2006 18:34:47 -0400 "Cam and Juli Hedrick"
<walnutcreek at appstate.net> writes:
> I have an SB-230 that I reworked into a SB-200 style.  My output is 
> 620
> watts keyed down.  Amprex 572B tubes in it and are great tubes....20 
> years
> old, but only 2 years use.  Meter 2500VDC and .520 ma, hmmm, a nice
> amplifier saved.
> Anyway, the Chinese 572B tubes are also good now.  I tried them in a 
> AL-572
> amp and then 1350 pep output.  They are now 3 years old and working 
> fine.
> still.
> 
> Good luck,
> Cam
> WA4JKW