>The B&W homepage lists the B&W 850 as still available. This tank coil is
>designed with the taps set for an inductance that yields a characteristic
>impedance suitable for the 4-1000A operating at max plate voltage
NO! NO! NO! NO! The B&W 850 was NOT designed for the 4-1000A. It's
inductance values are not even close and you have to do some real
fiddling to make it work with proper Qs. The impedance of a 4-1000A at
6KV is around 5KOhms. The 850 was not designed for that. Trust me. I
just finished my 4-1K amp around that tank coil. It was a pain.
That coil was designed to be used with samller tubes with much lower
output impedance. For example, the 10M coil is less than 0.8 uH. Using
that with a 4-1000A at 6KV will result in your loaded Q being around 40!
73,
Jon
KE9NA
--------------------------------------------------------------------------
Jon Ogden
jono@enteract.com
www.qsl.net/ke9na
"A life lived in fear is a life half lived."
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