1966 jtm45/100 super amp build

[Roe]

[CaseyJones]

The aliens have landed.

That's all they teach 'em in ChatRoom 101 on Aardvark 17, their home planet.

[jelle]

The 68K CC, the fourth one on the board, seems to lack solder.

Nice build!

[Roe]

thanks for the kind words. actually, the solder just ran a little bit down into the turret.

[Roe]

iI had a little oscillation but it went away when I changed preamp tubes from jj and groove tube to tungsram and tele ribbed plate.
I experimented a bit with different values. ended up with 220uf v1 cathode bypass cap, 500pf bright cap and .027uf pi coupling caps. reducing the v1 cathode cap is good for tight riff but you loose that EC (and hendrix) sound, esp. the lead sound. reducing the coupling caps reduces bass without taking away as much gain. Also, I use .018uf after v1, not because I don't have .022ufs but because I'd like to tame the bass just a tad. having said that, this amp has a much tighter and more powerful bottom that the jtm45. the bass control and the presence control are much more useful than on my jtm45. The amp has about 30 hours on it now BTW.