To: | <amps@contesting.com> |
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Subject: | [AMPS] Diodes |
From: | 2@vc.net (measures) |
Date: | Tue, 22 Feb 2000 11:33:40 -0700 |
> >> I was reading the HF amps section the other day, and was surprised to read >> the flat statement that the filament choke is not necessary in >> grounded-grid amplifiers at HF. Or did I misunderstand? >> >> 73, Pete N4ZR >> >That is true if you are talking about indirectly heated tubes with a separate >cathode pin(s). The old glass tubes still need one. > >BTW, I see lots of ridiculously high bids for B&W FC-15's and FC-30's on >E-Bay. Bear in mind that these do not cover 160 meters when you are bidding! > The 9uH fil. choke in the SB-220 works quite nicely on 160m. To cancel the reactance of the choke, add approx 900pF to C2 in the 160m tuned input. cheers -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com Search: http://www.contesting.com/km9p/search.htm |
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