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 > > _______________________________________________ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio > > > > _______________________________________________ > AMRadio mailing list > AMRadio@mailman.qth.net > http://mailman.qth.net/mailman/listinfo/amradio
