Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: martre on April 19, 2021, 06:23:44 am

Title: creating a clean channel on a single channel amp
Post by: martre on April 19, 2021, 06:23:44 am

Hello
I would ask to the experts if my idea to add a clean channel on a laney gh50 amp (circuit is very similar to the JCM800 2204) is correct. Attached my schematic, by a DPDT switch I would route the output from the 66k resistor and enter in V3, the V2 grid well be grounded. What do you think?

Title: Re: creating a clean channel on a single channel amp
Post by: PRR on April 19, 2021, 02:07:56 pm

Welcome.

Grid of V3A needs to be well positive, like +150V DC. Your plan puts it at zero V DC. Gross distortion results.

Title: Re: creating a clean channel on a single channel amp
Post by: martre on April 19, 2021, 02:18:37 pm

Thanks, do you have other suggestion?

Title: Re: creating a clean channel on a single channel amp
Post by: ac427v on April 23, 2021, 08:17:31 am

What about connecting at p14 instead of p18? The topology would be similar to a Plexi. My home-brew Plexi clean settings are my favorite. Volume on 2, Mids on 2, Master on 10.