Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: jim on November 14, 2020, 05:17:31 pm

Title: Sano GS15
Post by: jim on November 14, 2020, 05:17:31 pm

I am trying to quiet this Sano GS15.   I  cannot find  a schematic.   This disc(.005mf) on the input is a big antenna for noise.  Just blowing on it makes noise like a mic.  Can I clip it out and use a shielded run or just use a fender style arrangement?  Jim

Title: Re: Sano GS15
Post by: jim on November 14, 2020, 08:19:09 pm

Fixed it with clipping out the cap  and adding shielded wire and 1 meg across switch with no change in tone.  What a strange input arrangement though.....Fender already did it right so whats their point? I left the resistor to the other grid in place. it was quieted down as well.  Gonna button her up.  Jim

Title: Re: Sano GS15
Post by: Latole on November 15, 2020, 04:09:22 am

Did the input jacks's shorting contact to ground are good ?

Some Sano schematics here ; I can't find GS-15

One with 0.005 cap:

https://www.amprepairparts.com/schematics.htm

Title: Re: Sano GS15
Post by: Latole on November 15, 2020, 04:25:52 am

From Google

Title: Re: Sano GS15
Post by: PRR on November 15, 2020, 12:51:49 pm

The Sano C-R was supposed to reduce "Guitar"'s bass in the lowest octave.

Title: Re: Sano GS15
Post by: jim on November 15, 2020, 02:44:12 pm

The shorting jacks are good.  The amp sounds less s***kicker and more Fendery with the cap out.  I replaced a few coupling caps.  Its smooth and rich but the tone did change a little.  Hope this guy likes it.Thanks for the help.  Jim