Telefunken Echomixer "Kanal A" Pre Amp

 A cool little pre amp circuit from an old german reverb unit. It is fairly clean on its own, it adds some volume, lows and sparkles to your sound. When being puched hard, it clips in a very pleasant way. It also works great for pushing a tube amp. And of course it can be used as a studio tool for drums and keys.

The stock transistors were TFK OC603s. After some experimitation I found out that low leakage transistors wih Hfe between 70 and 120 sounded best (....at least to my damaged eardrums) so transistors spec'd for Rangemasters or USSR germaniums works really good.

 

 

 

Layout with onboard voltage inverter. (Still unverified)

 

 

 

 

Mellowtone Singing Tree OD

 

Electro Harmonix Little Big Muff Op Amp version

 Per request.

Fuzzhead Fx AN-602 O.D.

Just is a variation of a russian big muff. The base eq of the circuit is preserved i. e. dark, bassy and heavy but there is much more gain and volume on tap. There is also an old school inductor based Mid Boost circuit at the recovery stage that boost and saturate frequencies at 800Hz.

 

 

 

Spaceman Effects Orion Reverb

 Per request. 

Note that he relay bypass switch circuit is omitted.  Based on schematic from Dead End Fx.

El Musico Loco Wee Beaver Fuzz

 Uh oh. Post number 1000. I think I have a problem. :-p.

Here is a great sounding simple fuzz from a most excellent builder. It is loosely based on Os Mutantes Fuzz, an aggressive, buzzy and squelchy 60s style fuzz. The most noticable addons are the tone control which are big muff based but it seem to have much wider range. There is also an added recovery stage. The original had 2SC1815 (BCE pinout) transistors which easily can be replaced with 2N2222, MPSA06 or 2N3904.

The schematic is avaiable at FSB.

Electro Harmonix Little Big Muff - transistor version

 Per request. The switch can be replaced with a tone control. Just omit 100k resistor at column 17 and replace the switch connections with the lugs of the 100k tone control.

Shin-ei ME-7 Wah-Hurricane-Siren-Surf-Volume

 This was a request. It is an old multieffect that includes wah, two noise generator settings, a volume pedal setting and a "Siren" switch which is an oscillator. 

 

 

 

 

Royal CW-1 Cosmo Wah Machine

 Now this is some crazy stuff! How about a wah / ringmodulator with vibrato tails???

The schematic is avaiable at DeadEnd Fx.

Note that the Wah/Cosmo Select switch is the stock 2P6T rotary for this layout.

 

 

Royal RP-2 Fuzz Wah Machine

 Another old japanese obscurity. There is a hand drawn factory schematic floating on the web but I decided to clean it up in order to build a clone. It looked like slimmed down Ibanez Standard Fuzz with a tone control. and a  "Howl Adjust" control which dials in the upper octave.

And built the fuzz section only...and it wasn't any good...at all. Lacking in gain, output volume and the tone control was useless. So I had to mod it without tinkering too much Added a "gain cap" across the source of the input FET transistor and ground and subbed the ge diodes for silicon. For the tonestack I simply moved the 3,9nF cap from bass side to the treble side and the 33nF from treble side to the bass side. It now behaves like the tonestack in Foxx Tone Machine but it is not as scooped. Volume control was increased to 250k and the 2SK30 input FET was just not cutting it so I replaced it with a 2SK117 for much more gain on tap.

Much better! But still not as good as a regular Superfuzz or Standard Fuzz IMHO. But it was fun to tinker and "improve"old forgotten stuff.:-)

Fuzz section with suggested mods.

 

 

Wah section

 

 

 

Schematic

 

 

 

Royal RC-1 Effect Machine

 The Royal line of effects was made in Tokyo, Japan in the early 70s by Thunder Electronics. Not much is known about the company but they had some own designs in their portifolio along with the casual Shin Ei superfuzz clone.

Royal RC-1 Effect Machine was an inductorless wah which topology was based on fuzz face and a twin notch filter. It is not the most powerful or vocal wah but it does a decent job after a superfuzz just like in Royal RFC-1 Double Effect Machine.

 The layout and schematic is verified.

 

Foxx Select A Fuzz MOJO layout

 The last mojo layout for a while. This one isn't one of the classics, quite the opposite. It isne of the rarest vintage fuzzes out there and for the longest time noone knew what the circuit was like until Deadend Fx managed to trace it a couple of years ago. It is a quite heavy affair, especially  when the larger input caps is selected. Fairly low gain NPN silicon transistors is recommended, in the 100-150 Hfe range.

Compact layout avaiable HERE.

 

 

Shin-ei FY6 Superfuzz MOJO layout

 Compact layout avaiable HERE.

Roland AF-100 Bee Baa MOJO layout

 Compact layout avaiable HERE. 

Electro Harmonix V5 IC Big Muff MOJO layout

 Compact layout avaiable HERE.

 

 

ProCo Rat MOJO layout

 Compact layout avaiable HERE.

 

 

Maestro FZ-1S Super Fuzz MOJO layout

 Compact layout avaiable HERE.

 

 

Maestro Brassmaster MOJO layout

 Compact layout avaiable HERE.

Foxx Tone Machine MOJO layout

 Compact layout avaiable HERE.

 

Ibanez No. 59 Standard Fuzz MOJO layout

 Compact layout avaiable HERE.