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[AMPS] Diodes

To: <amps@contesting.com>
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  

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