B@llsbreaker tube amp

[Renegadrian]

I was reading this article in an italian guitar portal and just wanted to share it with you, I guess the owner won't mind, as he shared the schem! Here it is then!!!



And the video...It seems it quite screams!!! Nice! And he described how it was made after a lucky visit at a dumpster!!!

http://www.youtube.com/watch?v=a22zWI1YlN8&feature=player_embedded

[maarten]

Adriano, does the article say anything about the difference between the selenium rectifier and the 1N4007? I suppose the selenium is in reality 4 diodes (a selenium diode bridge: in the video you can see it sitting in the old chassis, marked 250V/50mA - same as in the schematic. The visible connections to it are marked + and -; the two other connections that should be there - both for AC from the powertransformer- can't be seen), but this does not show on the schematic...
Also, there are 2 switches next to the On/off switch; one of them is labelled "filter"' the other one has no label. On the schematic I see only one switch (for the selection of the rectifier) - does the article tell you something about the other one?

Maarten

[Renegadrian]

I'll try to translate some bits for ya!

Once the wiring was done I made a couple of mods to give more "air" when the gain pot is at low levels (the left switch slightly boosts the bass while the right one is MidBoost/flat/Bright, which just filters some frequencies to go directly beyond the gain pot) - we thought a tone control wasn't needed, not just for the tiny workspace.

As for the diodes, he wrote they tried Si but found selenium better.

Hope that helps!

[Brymus]

That amp sounds KILLER ,except for that wierd intermitent buzzing at high gain (sounds like snare strainer rattle sort of)
But yeah nice clean ,chimey sounds,and really good gain.