[AMRadio] Fall Housecleaning

[David Knepper]

Come and get it and make a small donation to the CRA.

RCA Studio Consolette Type BC-8A Board
and other goodies

Lots of racks and other misc. goodies.

Old test equipment.  Even a Zenith console.

No reasonable offer refused.

We are remodeling the "Studio B" and this stuff has to go.  PICK UP ONLY.
Near Johnstown, PA
at the Collins Radio Center, headquarters of the Collins Radio Association.


Thank you
Dave, W3ST
Secretary to the Collins Radio Association
Publisher of the Collins Journal
www.collinsra.com
----- Original Message -----
From: "David Knepper" <cra at floodcity.net>
To: <amradio at mailman.qth.net>
Sent: Saturday, November 22, 2003 2:15 PM
Subject: Re: [AMRadio] RF Chokes


> Anyone interested in several large BW butterfly capacitors with a full set
> of KW swinging link coils?
>
>
> Dave, W3ST
> Secretary to the Collins Radio Association
> Publisher of the Collins Journal
> www.collinsra.com
> ----- Original Message -----
> From: "John Coleman, ARS WA5BXO" <wa5bxo at pctechref.com>
> To: <amradio at mailman.qth.net>
> Sent: Saturday, November 22, 2003 12:15 PM
> Subject: RE: [AMRadio] RF Chokes
>
>
> > Hey Jeff, why don't you build a linear grounded grid out of a pair or
> > all three 450s?
> > 1. You would have the plate dissipation capability.
> > 2. No high level modulator required.
> > 3. Pi Net output.
> > 4. No need to neutralize on the lower frequency HF bands.
> > 5. Same filament source required as with class C and plate Modulator.
> > 6. Full output beyond the legal limit.
> > 6. Easy Solid State Biasing.
> > 7. One HV supply.
> > 8. Less distortion.
> > 9. Less TVI.
> > 10. No arcing when over modulated!
> > 11. Smaller foot print (the amp, not you)
> > 12. Good on all modes.
> >
> >
> > Disadvantages
> > 1. Due to high filament current you will probably have to wind your own
> > filament RF choke of # 6 wire or bigger.
> >
> >
> >
> > -----Original Message-----
> > From: amradio-admin at mailman.qth.net
> > [mailto:amradio-admin at mailman.qth.net] On Behalf Of Geoff/W5OMR
> > Sent: Saturday, November 22, 2003 9:55 AM
> > To: amradio at mailman.qth.net
> > Subject: [AMRadio] RF Chokes
> >
> > A while back, some ham came over, and we got to talking about
> > homebrewing.
> > He was building something, and needed an RF choke.  I had a brand new,
> > never
> > used, National RF choke, still in the original box.  At the time I never
> > had
> > any plans of building anything.  I have my push-pull, link-coupled 250TH
> >
> > final, and even though it was built in the 50's, it will probably
> > outlive me.
> >
> > But, recently I got the urge to build.  I think the conversation here
> > about
> > all the homebrewing that's been going on had a heavy hand to spark that
> > interest.  I thank y'all for that.
> >
> > The plan is to build up a final, using a single tube in the final.
> > Either a
> > 450TL, or a 304TL.  I'm leaning towards the 450TL, because I've got
> > three of them, and a single tube, modulated by a pair interests me.
> >
> > I've got the main tuning capacitor (B&W Butterfly w/neutralization caps
> > on the back) an HDVL jack-bar, all the plug in coils for 80 thru 10, an
> > aluminum chassis to mount it on, and most of the necessary associated
> > hardware... except for the RF choke.
> >
> > I found a couple on E-bay... but $8.oo to $10.oo?  Are they really that
> > expensive, even still today?
> >
> > Does anyone have a spare they wouldn't mind parting with?
> >
> > 73 = Best Regards,
> > -Geoff/W5OMR
> >
> > _______________________________________________
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> >
> >
> >
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