>Hi gang, I've got a half dozen 4-400A's that I would like to test. Is it
>possible to run these in a SB-220 without many mods? Or should I wait til
>July 4 and just drop 'em in and see what happens? Tnx Bill, K2HV
>To use 4-400As in a SB-220, put a 2 to10 ohm 2w resistor between pin 3
>and pin 4 (grid-screen). Short the zener bias diode with a jumper. The
>ZSAC will be a bit low for SSB, but they will work ok. 4-400s like to
>see at least 3500v.
>cheers
>Rich...
>
>R. L. Measures, 805-386-3734, AG6K
I once used 4-250As in my SB220 and it ran just fine, all I did was short
the zener, would work the same with 4-400A bottles. This is more then 20
years ago so dont remember how much power it did put out but I guess it was
around a KW.
73 merry xmas de Jim SM2EKM
--
FAQ on WWW: http://www.contesting.com/ampfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|