Hi!
I'm rebuilding an old amp, Carvin 33, and there's one unused pot/whole in the chassi. At the moment the idea is to add a presence control. Looking at Fender schemes I see that the presence control is altering the ground bypass, see 5f6a scheme. Other schemes I've looked at have the pot controlling the negative feedback... I'm not sure of wich way to go.
1. Replace the NFB resistor with a pot.
2. Bypass the ground with a pot ala-Bassman 5f6a and thinker with the value of the NFB resistor until I have a value that rings nicely.
Or maybe if someone has an other simple mod I can add, to my build. This build is based on the carvin 33 circuit.
I'm rebuilding an old amp, Carvin 33, and there's one unused pot/whole in the chassi. At the moment the idea is to add a presence control. Looking at Fender schemes I see that the presence control is altering the ground bypass, see 5f6a scheme. Other schemes I've looked at have the pot controlling the negative feedback... I'm not sure of wich way to go.
1. Replace the NFB resistor with a pot.
2. Bypass the ground with a pot ala-Bassman 5f6a and thinker with the value of the NFB resistor until I have a value that rings nicely.
Or maybe if someone has an other simple mod I can add, to my build. This build is based on the carvin 33 circuit.
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