4-400 pulls last rotated in a Johnson Thunderbolt around 10 years ago. (4pcs.)
Old Johnson Thunderbolt amp. It is very rough but worked well 10 years ago. It should be considered a parts project amp.
Should I sell the tubes and amp together?
The amp has no inductor in the B+. It has been converted to capacitive filtering with solid state rectifiers.
4-400 Johnson Thunderbolt Amp.
Re: 4-400 Johnson Thunderbolt Amp.
I like the Thunderbolt and own one!
Take it to a hamfest. Take the first cash offer you get, as-is.
Be done with it!
Paid $100 for mine in nice looking condition with goid tubes and bad choke. That power transformer will overheat and die if given any serious on time with a C input filter. It really needs original choke and cap values if it's gonna be used a lot.
If you don't care about the time and parts scrounging... get it running, add some relays and PTT keying, and trade it locally for about $250.
73, -bob
Take it to a hamfest. Take the first cash offer you get, as-is.
Be done with it!
Paid $100 for mine in nice looking condition with goid tubes and bad choke. That power transformer will overheat and die if given any serious on time with a C input filter. It really needs original choke and cap values if it's gonna be used a lot.
If you don't care about the time and parts scrounging... get it running, add some relays and PTT keying, and trade it locally for about $250.
73, -bob