|To:||Clay Curtiss W7CE <firstname.lastname@example.org>|
|Subject:||Re: [Amps] Johnson Thunderbolt questions|
|From:||Joe Giacobello <email@example.com>|
|Date:||Sat, 13 Mar 2004 10:24:58 -0500|
Clay, I no longer have my Tbolt but I never used that resistive position
to drive it. It sounds like that's what you're doing. I simply
selected the input for the band I wanted, tuned the grid in CW mode
(Class C) to obtain the proper drive current, loaded it up in that mode
and then switched to SSB. When loaded to saturation, I could get about
900W out on CW with about 20-30 mA of drive.|
Modern transceivers do not need the swamping network. Just feed it directly with your 730 and reduce the drive to obtain about 25 mA, equivalent to about 25 watts.
I replaced all of the rectifiers with solid state equivalents. You can buy plug-ins for all of them or you can homebrew them. K2AW's silicon alley sells suitable diodes for the HV supply.
Hope that helps.
Clay Curtiss W7CE wrote:
I'm in the processing of bringing a Johnson Thunderbolt amp up and can't quite make sense out of what I'm seeing. I'm hoping there is someone out there with experience using the Thunderbolt (or a pair of 4-400A's) as an AM linear. I've searched the list archives and found lots of old threads about Thunderbolts, but none of them addressed my situation.
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