Dave,
I have no idea if they make chokes but you might try these folks. They may
do custom work; this place is owned by Hams.
http://transformerdesignandsupply.com/
Dave
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of DAVE WHITE
Sent: Sunday, December 14, 2008 4:53 AM
To: N7SC; Amps@contesting.com; W7RY
Subject: Re: [Amps] WTB Henry Choke
I asked Ted Shannon at Henry Radio about a plate choke because I have spares
for most of my homebrew 3CX3000 amp, but not a plate choke.
Ted told me that Henry are no longer producing tube amps of that nature,
don't produce componenets and don't even have the specs to hand any more.
The stuff they sell on ebay they buy in.
I tried to get hold of a Peter Dahl choke, but it seems that they've gone
out of business and that Harbach have bought the rights to their name and
designs. However, Harbach told me that they only manufacture Peter Dahl
transformers at the moment, not chokes. And in any case, I can get cheaper
and equal quality transformers from TEC here in England - plus I don't have
shipping costs.
B&W stuff seems unobtainable these days.
So.....
I think we have to go back to REAL home brew.
There seem to be plenty of designs in the literature over the years, and now
we have access to more effective test kit at a low price than the old tube
type dip meters of old - so why not get a teflon rod (about 5 bucks off
ebay) and wind one?
Speaking of cheaply available test kit, I bought a pretty new spectrum
analyser with a built-in sweep generator off a fellow Ham just recently to
upgrade my home brew one built 15 years ago. It's a quality German-made
instrument that he'd bought new recently, not dodgy Chinese trash and I was
amazed that no-one had shown any interest in his advertisement in the RSGB's
magazine. I got it for a really cheap price and when I mentioned that I'm
recovering from spinal surgery he even drove 200 miles to deliver it for me
personally. It almost restores my faith in human nature and made me feel
guilty about haggling him down on price!
So.....
See if you can find someone locally with a good frequency counter, LCR meter
and dip meter, wind a coil that looks kinda the same, short the ends out and
measure if there's a series resonance in the ham bands.
My amp runs a pi-L with rollercoasters on all bands 160-10m and I built my
choke as a single winding with a measured resonance on 12.2MHz. Although
there were one or two little dips elsewhere it hasn't exploded ......yet
If it helps I can send a spec and photos?
cheers
Dave G0OIL / K2MOO. Mooooooo.
--- On Sat, 13/12/08, W7RY <w7ry@arrl.net> wrote:
> From: W7RY <w7ry@arrl.net>
> Subject: Re: [Amps] WTB Henry Choke
> To: "N7SC" <n7sc@charter.net>, Amps@contesting.com
> Date: Saturday, 13 December, 2008, 5:39 PM
> Did you try Henry? They seem to be selling transformers and
> chokes on Ebay.
>
> 73
> Jim W7RY
>
> ----- Original Message -----
> From: N7SC
> To: Amps@contesting.com
> Sent: Saturday, December 13, 2008 8:41 AM
> Subject: [Amps] WTB Henry Choke
>
>
> GM All...
> Looking for a working HV choke used in the Henry Tempo
> 2002/2006/6N2
> VHF amplifiers...maybe even a parts amp. Please respond
> off list if you
> have anything available.
>
> Thanks...Steve
>
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