Thanks George. Ah, well. I wasn't too far off guessing at 10 megs then!
I seem to remember seeing something like this on the fleamarket at Weinheim UKW
Tagung quite some years (10-15+?) ago when the meeting was at the old
Realschule in Weinheim West. The seller, whom I've come to know quite well
over the years reckoned it was on 27MHz, so clearly different to this one in
that respect. Also the HT transformer was huge and it had a 10kW slug in the
thruline.
It was expensive, I didn't have a lot of money at the time and I decided to
sleep on the decision. My wife persuaded me to buy it (yes, really!!). On the
Sunday morning I went along to see what I could get it for.....but he'd sold it.
"Carpe diem" and all that....... :-)
In the end I'm glad I built my own, I learned so much more....the hard way. A
hell of a lot cheaper, too! Checking rectifiers, rollercoasters and a plate
transformer in at Orlando International Airport was fun though, as was carrying
a half-dozen tubes through as hand luggage. I'm glad it was a long time ago.
Post 9/11 I'd probably have ended up with an orange jumpsuit and signing
KG4/... As it was, the nice security people x-rayed my tubes for me so we
could look at the grid structures. You see, there IS value in my wife's
insistence what we arrive at airports about 3 hours early!
cheers
OILy
--- On Thu, 8/1/09, george <k4gvt@comcast.net> wrote:
From: george <k4gvt@comcast.net>
Subject: Re: [Amps] interesting piece of kit.....
To: "DAVE WHITE" <mausoptik@btinternet.com>
Cc: amps@contesting.com
Date: Thursday, 8 January, 2009, 4:50 PM
Dave, these "RF generators are used for ISM (Industrial Scientific
Medical) use. One of the most common frequencies for this purpose is
13.56MHz.
When in services such as semiconductor manufacturing they are used for
generating plasmas, they typically have heavy hours, but are very clean,
since they spend most of their life in a clean room environment.
73,
George, K4GVT
DAVE WHITE wrote:
> This looks like an interesting piece of kit:
>
>
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&Item=330299130000&Category=1504
>
> 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
>
>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
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