[Heathkit] Tubes for SB-200

[Glen Zook]

The Chinese made 572B tubes (and this includes Cetron
these days) often have problems when operated in the
horizontal positions as in the SB-200.  The elements
"sag" and the tubes "short out" often taking some of
the power supply components with them.

The Russian built tubes seem to work fine in the
SB-200.

Glen, K9STH


--- "Kenneth G. Gordon" <kgordon2006 at verizon.net>
wrote:

> Which tubes would you recommend to replace the two 
> 572Bs in 
> my SB-200?
> 
> AES has them at $169.00 each, but a pair of those
> would cost 
> more than the amp.
> 
> I haven't been able to find out whether or not
> Cetron is still in 
> business.
> 
> The Svetlana versions appear to have rather small
> plates and 
> higher mu, so may not work correctly in the SB-200
> 
> The Chinese tubes are certainly inexpensive, but I
> have not been 
> able to find out anything about their reliability,
> etc.









Glen, K9STH

Website:  http://k9sth.com


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