Hoffman Amplifiers Tube Amplifier Forum

Other Stuff => Solid State => Topic started by: Jack1962 on March 13, 2014, 09:36:54 am

Title: Vibrato not working on Kustom K200(Frankenstien)
Post by: Jack1962 on March 13, 2014, 09:36:54 am

I have a Kustom K200(frankenstien) here than the roach is out on the Vibrato my question is would the roach for a fender work in this circuit , sorry but the JPG is the only schematic I could find

Title: Re: Vibrato not working on Kustom K200(Frankenstien)
Post by: sluckey on March 13, 2014, 10:37:55 am

The Fender roach will not work in that circuit. The neon lamp inside that roach needs about 90 volts just to fire.

Your circuit uses a low voltage low current incandescent lamp. You can use a vactec VTL5C1 opto switch (available from Hoffman) to replace your Kustom roach. Probably need to increase the value of R325, depending on how much voltage is feeding the lamp.

Look at page 2 of this pdf to see my notes about replacing the roach in my Sunn...

     http://home.comcast.net/~seluckey/amps/sunn/sunn_sceptre_1971.pdf (http://home.comcast.net/~seluckey/amps/sunn/sunn_sceptre_1971.pdf)

Title: Re: Vibrato not working on Kustom K200(Frankenstien)
Post by: Jack1962 on March 13, 2014, 02:55:44 pm

Thanks Sluckey , I have used those (VTL5C1) actually on fenders and they work great .