What do the cost? I am interested.
David Knepper wrote:
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" <[EMAIL PROTECTED]>
To: <amradio@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: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Geoff/W5OMR
Sent: Saturday, November 22, 2003 9:55 AM
To: amradio@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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