On Sat, 21 Nov 1998 20:17:01 -0800 "Jim Heath" <jimheath@foothill.net>
writes:
>What is an old Henry 2K from 1964 worth? The plate current meter has
>been replaced with a Shurite (sure-wrong) meter. It is about a 7 out
>of 10. It still has 3-400z's. The plate transformer is now a Peter
>Dahl. There are no other mods. It even has the old 3B28's.
Around here you can find them complete and original for $400 or so.
>Also, what is a Henry 2k-2 from 1972 worth? It is about an 8 out of
>10. It too still has 3-400z's.
Not too much more. It is getting hard to find homes for heavy iron these
days unless it is a collector.
>
>Any advice on converting either of these to 3-500z use is welcome.
>Neither has bias. I just happen to have some 3-500z's and no
>3-400z's.
Neither has operating bias but they do have cut-off bias. Lift the
operating bias lead and replace with a reverse connected string of
1N5408' s to give around 220ma idle current. Or a 50W zener.
I forget which one of the models requires a different plate cap for
clearance...think its the 2K-2. You can buy the low profile ones from
Omega Electronics since they were used by Amp Supply....or adapt a
transistor heat sink.
73 Carl KM1H
>
>Thanks!
>
>Jim KB6SX
>
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