On Nov 4, 2004, at 12:15 AM, Steve Thompson wrote:
Tony King wrote:
At 01:21 AM 11/4/2004, R.Measures wrote:
<snip>
A GS-35b has 0.12pF of anode-cathode feedback C. An 8877 has 0.10pF
of it, so they have a fairly similar amount of internal feedback.
Our 8877 low VHF-Q parasitic suppressor retrofit kit has both an
anode suppressor and a cathode suppressor. It comes with a money
back guarantee. So far, the only refund has been to a guy who said
he did not know how to solder. -- Today's trivia question: At its
max freq of 1000MHz, what is the reactance in ohms of the
output/input feedback path in a (g-g) GS-35b?
Very interesting. My guess: 1326
Feedback C on the data sheet is almost certainly measured at low
frequency.
The feedback characteristics at V/UHF might be different.
Not for any reason I can see. The dielectric is a vacuum, not an
organic compound.
By now there's lots of amps out there using the Russian planar
triodes. Has
anyone heard of any problems?
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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