To: | <amps@contesting.com> |
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Subject: | [AMPS] Re: Filament Chokes |
From: | ve3ax@cujo2.icom.ca (222WAS7) |
Date: | Tue, 22 Feb 2000 17:03:55 -0500 |
OK here's the question...... What about an 8877 with separate cathode/filament on 6 meters? I have seen with, and without, in published designs. What do the gurus say? 73 Peter VE3AX measures wrote: > > > >> 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 -- 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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