Those Henry generators are built in many variations, that one seems to be a
13.56MHz version.
I own an older 2000D for 27.12MHz which I use on 10m, in there the laoding
capacitor is a vacuum variable.
Its equipped with a 4-400A driver and 6146 pre driver.
That one of the auction is probably with solid state driver.
It should be very easy to convert it into a 20m monoband amp.
73
Peter
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of DAVE WHITE
Sent: Donnerstag, 8. Januar 2009 16:56
To: amps@contesting.com
Subject: [Amps] interesting piece of kit.....
This looks like an interesting piece of kit:
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&Item=330299130000&Category=1
504
An "A43984 Henry RF Power Supply".
It looks a bit of a "home brew" solution to capacitors: Fixed doorknobs and
adjust the last few pFof tune and load with a couple of sets of two plates,
one on a thread with a sheet of PTFE in the middle, but I guess it works!
I recently saw a 4PR1000A amp which had the opposite solution: fixed
doorknob-type capacitors and a Pi inductor that was squeezed or stretched by
a piece of threaded PTFE through the middle, though this one looks like a
Pi-L
I'd guess at around 10MHz, but there looks like quite a lot of L in the
plate choke for that.
If it's only run at 2kW out, I think that makes the tube potentially
under-rated by 75% unless there's a really low HT.
The transformer looks a bit smaller thsan many I've seen. I recently got a
quote from TEC in Basildon for a 4.5kV at 10kva single phase transformer and
it was going to weigh 250lbs and measure about 1 foot cubed. Oo-er. Nearly
twice my weight. I did worry about putting this in an upstairs shack, but I
guess it's only like a fat lad sitting in the corner!
cheers
Dave G0OIL
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