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