Schaller Treble-Bass Boost

Not much info on this but, it's a rare West German Schaller vintage “Treble-Bass Boost” from 1968. It typically goes for over $400usd, so fairly desirable. It's a 2 transistor based booster, with a five position switch that controls the the frequencies being boosted. There's 2 treble settings, 2 bass settings, and 1 mids setting. Seems like it also gives a little bit of drive too, which is a nice addition.

Schaller Fuzz '72

Argh. I just hate it when i draw a layout and when i'm posting it, i can't find anything but just a few photos of the original unit - No ad texts, no original ads no nothing. Just a few images from google image search and one youtube clip from different design by the same manufacturer. So i have to go it alone.

Schematic and circuit blueprint does not differ that much from Fuzz Face, so it's safe to assume that this was german made FF-clone of the seventies. Some values are slightly different, but, it basically sounds just like any other silicon Fuzz Face. Built it myself, and i like it. Not a bad thing to have. Use as low hFE transistors you can get. 2N2369 and 2N3903 are good candidates... Built mine with 2n2222 TO-18 metal cans, and.. You guessed it.. It's not that far from my 2N2222 Si Fuzz Face clone - or from my Vox Tonebender '66 clone. So it's not super pretty, but interesting FF adaptation anyway.

If your Q2 bias needs some tweaking, that 3K3 resistor is good place to start. Replacing that with 10K trimmer wouldn't be too back of an idea. One could move that electrolytic connected to 3K3 three columns left and place trimmer as simple variable resistor between rows four and six. Did that to my board, and it's at its sweetest around 4K7-5K.

Schaller Tremolo

Request.  I've already done the Hearthrob but someone asked for this, and you can never have too many tremolo options I suppose.  Some of those transistors look like they may be difficult to get hold of, so I'd probably just use 2N5088's which work fine in the Hearthrob.

If you do use other transistors make sure the pinouts of your build match the pins shown in the layout.