Here's the cheap'o attenuator I built:
Mostly used for High Octane(5W) with 6V6 tube.
Also used for Spitfire (15W) clone, runs quite hot at full 15W tube power
but should be ok. 4 ohm only.
High Octane with attenuator
http://home.online.no/~eber-ha/TubeAMP/ ... 65SD_1.mp3
High Octane without attenutaor
http://home.online.no/~eber-ha/TubeAMP/ ... _NO_A2.mp3
I actually prefer playing the amp with the attenuator
since it cuts of the high freq. a bit. (and saves my ears)
My High Octane has a small Fender Champ transformer which is very
bright,and the Spifire is also bright if you run it at full power distortion
with EL84. So it suits my needs at the moment.
Could be used for the 18 watt also but maybe some
higher watt resistors(+5W).
Espen