Hi Mike,
Yes many HENRY amps were using the filaments in series. Looks like you're
excited about your new amp to configure the way you want it. Sounds like a
good HD PS.
Enjoy!
73, Dan Magro W7RF, (President WARC 1999, member SCDXC, SCCC)
Manufacturers Rep & Distributor for HENRY RF Power Amplifiers.
RF Applications Power Measuring equipment, See the VFD & WinWatt!
www.radiodan.com <http://www.radiodan.com> RFpower@radiodan.com
<mailto:RFpower@radiodan.com> A trip to our web site is worth the click!
> -----Original Message-----
> From: owner-amps@contesting.com [mailto:owner-amps@contesting.com]On
> Behalf Of Mike Baker
> Sent: Tuesday, November 16, 1999 7:51 AM
> To: AMPS reflector
> Subject: [AMPS] 3-500Z fils in series???
>
>
>
> Hello to all on the reflector,
> Well, a friend of mine just made me an offer I can't refuse. He and
> I have made a deal on his homebrew KW affectionately know as
> "Frankenstien" at a price I just couldn't pass up. A brief description
> follows.
>
> Finals are a pair of Eimac 3-500Z with chimneys and pressurized lower
> chassis via a large but quiet blower.
> Power transformer and supply is out of an industrial RF heating machine
> and is capable of much more than the mear 1500 watts the amp is designed
> for. Plate voltage is about 4 kV key up and about 3500 key down at full
> tilt with about 75 watts of drive. Uses a bank of 470Mfd 450VDC large
> computer type caps to give 47 mfd at unknown voltage rating. (I haven't
> looked inside the amp yet and have not picked it up yet either.)
> Tank circuit is a flat wound taper spaced coil with a jennings vacuum
> variable on the load and a large air variable on the tune with turns
> counters.
> All in all, I like my buddy Bob's construction as it is as I would build
> it myself, BEEFY! A very conservative 1500 Watts output in any mode.
>
> Now to my question.
> He said he is using a "Henry" filament transformer and that the fils are
> in series! Never seen this done before.
> Is this in fact how some/most/any of the Henry amps are built?
> Any pros or cons for series filaments?
> Radio Dan, this one is right up your alley!
>
> Looking forward to all of your input and comments either way.
> Best 73
> Mike Baker KØQZ
>
> P.S. I CAN'T WAIT TO GET FRANKENSTIEN HOME THIS WEEKEND AND THEN GET
> 240 AC WIRED TO THE SHACK. LOOK OUT CQWWCW WEEKEND!!! YEAAA!!!
>
>
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>
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