![[-]](https://theultimatetone.com/images/collapse.png "[-]")
01-02-2023, 06:31 PM
Hi All!
I'm currently working on my third amp project. Its basically a JCM800-type front preamp and tone stack coupled with a Fender Bandmaster57-style power section, with a few minor alterations. The Bandmaster has fixed NFB using a 56K into the cathode of the 1st PI tube, with a 5K-ohm and .1uf presence circuit. I'm using 3.3k on that cathode, and am going to try a variable NFB circuit using a 68K fixed resistor in series with a 50K variable resistor on a switch to allow either adjustment or elimination of the NFB. The presence control I've selected is using a 50K variable instead of the 5k used by Fender, basically for more range of control.
I'd like any and all opinions of those changes to the basic Fender circuit. Thanks in advance for all replies!
I'm currently working on my third amp project. Its basically a JCM800-type front preamp and tone stack coupled with a Fender Bandmaster57-style power section, with a few minor alterations. The Bandmaster has fixed NFB using a 56K into the cathode of the 1st PI tube, with a 5K-ohm and .1uf presence circuit. I'm using 3.3k on that cathode, and am going to try a variable NFB circuit using a 68K fixed resistor in series with a 50K variable resistor on a switch to allow either adjustment or elimination of the NFB. The presence control I've selected is using a 50K variable instead of the 5k used by Fender, basically for more range of control.
I'd like any and all opinions of those changes to the basic Fender circuit. Thanks in advance for all replies!
