Check this link for the full derailment schem.... including an Octal mod. There is however no provision for an EL84, I think the idea was that this was to be a two tube project...... maybe one could mess around with values a little and use 6C10 (triple triode) with EL84...
Enjoy
graham
__________________________________________
Cheers and Beers.
Check this link for the full derailment schem.... including an Octal mod. There is however no provision for an EL84, I think the idea was that this was to be a two tube project...... maybe one could mess around with values a little and use 6C10 (triple triode) with EL84...
From my understanding, the Derailment was ment as a 2 tubes single ended wreckish design. It did work very well with an ECL86, but, as they are not produced anymore (and I was having a hard time finding a good one at a good price), I simply switched it to a 2 x 12ax7 and 1 x el84. As far as I remember, I didn't have to change the cathode resistor for the EL84. So, simply sub the ECL86 with an extra 12AX7 and an EL84.
I had planned to go that way from the get go but wanted to try the ECL86 (that is why you see an empty socket hole in the chassis). I will post a picture of the finished amp (in a 'matchless' style combo with a wooden faceplate).
The only mods that I have on it is the wreck / fender switch and a variable cathode on the 'cut' stage.
slajeune wrote:From my understanding, the Derailment was ment as a 2 tubes single ended wreckish design. It did work very well with an ECL86, but, as they are not produced anymore (and I was having a hard time finding a good one at a good price), I simply switched it to a 2 x 12ax7 and 1 x el84. As far as I remember, I didn't have to change the cathode resistor for the EL84. So, simply sub the ECL86 with an extra 12AX7 and an EL84.
I had planned to go that way from the get go but wanted to try the ECL86 (that is why you see an empty socket hole in the chassis). I will post a picture of the finished amp (in a 'matchless' style combo with a wooden faceplate).
The only mods that I have on it is the wreck / fender switch and a variable cathode on the 'cut' stage.
After a lot of thought, I think I've decided to go with the octal mod with 2 x 12AX7 (instead of the 6C10) and either 6V6 or EL34. One question: On page 2 it states to tie pins 1 & 8 together for EL34 compatibility. Can I leave pins 1 & 8 together permanently and switch between 6V6 and EL34? I assume I can, but, you know what they say about assume
Thanks
You do not have the required permissions to view the files attached to this post.
I haven't tried those mods either. They change the gain of each stage and in the case of the last stage (10k or 4.7k), it changes the 'cut' stage (i.e. loosy said, the amount of distortion or onset of distortion).
that would be correct. Pin 8 connects to the filament reference. Basically, you reference the filament to the cathode of the power tube. If pin 8 is the cathode, you reference it to this pin. If pin 7 is the cathode, you reference it to this pin.