SB200 PAs

[Multi-Volti Devices]

Cetrons were US made, last I heard. I thought Richardson Electronics in
LaFox IL bought them out.

I thought Penta was Chinese, at least years ago.

I heard the Chinese ones are bad news when horizontal; grid or filaments
(don't remember) not designed for horizontal operation, resulting in
catastrophic failure due to grid-cathode short. But, I haven't personally
experienced this.

Russian (Svetlana) 572-B comes in 'standard' form (mu=160 or so?), and some
'non-standard' low mu, (3, 10, 30) varieties for single-ended audio
applications. The low mu ones are to my knowledge designed for vertical
operation and low B+ (800 V max, I think). The 'standard', hi-mu one I
assume is for RF applications, presumably at typical high voltage, and you
better check their web site for horizontal info. I haven't heard anything
bad about them, but do your own research. I don't own any.

Murray

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