I've been a long time reader and after working with pedals I've decided I want to make an amp. I've collected lots of information about the Dumble Small Special and so far I've been analyzing this two schematics I found here:
Posted on this thread: http://ampgarage.com/forum/viewtopic.php?f=4&t=29979
I can't remember where it was posted.
Overall, the main differences are the tonestack, the 68k resistor into the grid of V1, the cap going out of the plate of V2 (in the layout is 0,01 uF), the resistor out of the master volume (in the layout is 1k2), the feedback resistor (in the layout is 100R) and the resistors going into the grids of the power tubes (1k5 instead of 2k2). Also, the power supply is completely different.
I understand how tube circuits work and I'm going to use the schematic to build my amp, but I have a few questions:
- Do I have to add a 68k resistor to the grid of v1 (as most fenders do)?
- Would it be better to use a 100R feedback resistor?
Thanks for your help. As soon as I resolve all this doubts I will start the building. Probably I'm going to record the construction and I promise I will post lots of pictures and media.