On 1/7/2013 9:32 AM, Hsu wrote:
Why few amp manufacturer use GU-81M,?it is cheap and rugged.
Probably because the manufacturers data sheet de-rates the GU-81 rapidly
as you go up in frequency. Few home brewers OTOH run them within their
ratings. According to builders in Europe they run 3 KW out of a pair
with no forced air cooling. Apparently this is a tube that can really
be abused and still hold up. I have no idea as to the IM when used like
this, but Carl might.
A pair do make a nice looking amp that is also quiet. I've been playing
with the idea of a pair on 160 through 40 or even single band.
73 Roger (K8RI)
Dr Alex Gavva QRO Parts Site: http://www.ur4ll.net
UR4LL
KO70XG mailto:ur4ll@ur4ll.net
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