Bradbrews
Super Member
I recently picked up a couple of mono blocks.
One is an essentially finished MKiii that has had a triode USA driver board installed, and the caps replaced with new ones in series to raise the voltages. Other new parts are in the unit as well. It seems ready to go, but I've yet to test it and measure Bias voltage.
The other one is what appears to be an original MKii, with very minor changes.
Included is another triode board, an SDS labs capacitor board, and a set of tubes.
The P.O. was going to mod the MKii to be like the MKiii but lost interest in finishing the project. I was told that both amp were working when they were pulled from service.
The MKii has the large circuit board, so I'm going to need to craft a spacer to be able to mount the triode board in it. The only thing that seemed not original in the amp was that it has an 11.2 ohm resistor instead of a 12 ohm. It still has the Selenium rectifier.
Is there any reason not to just proceed on with modding the MKii as the P.O. planned?
I will need a few more parts for the bias circuit and maybe add a choke instead of the 50 ohm resistor.
Should I try out the MKii with the tubes it has before I start into it? It still has the original old cap can.
Is there any reason not to just hook the finished one up and try it out? I have a DBT, but would need to borrow a variac. I'm a tube amp newbie, so tips appreciated.
One is an essentially finished MKiii that has had a triode USA driver board installed, and the caps replaced with new ones in series to raise the voltages. Other new parts are in the unit as well. It seems ready to go, but I've yet to test it and measure Bias voltage.
The other one is what appears to be an original MKii, with very minor changes.
Included is another triode board, an SDS labs capacitor board, and a set of tubes.
The P.O. was going to mod the MKii to be like the MKiii but lost interest in finishing the project. I was told that both amp were working when they were pulled from service.
The MKii has the large circuit board, so I'm going to need to craft a spacer to be able to mount the triode board in it. The only thing that seemed not original in the amp was that it has an 11.2 ohm resistor instead of a 12 ohm. It still has the Selenium rectifier.
Is there any reason not to just proceed on with modding the MKii as the P.O. planned?
I will need a few more parts for the bias circuit and maybe add a choke instead of the 50 ohm resistor.
Should I try out the MKii with the tubes it has before I start into it? It still has the original old cap can.
Is there any reason not to just hook the finished one up and try it out? I have a DBT, but would need to borrow a variac. I'm a tube amp newbie, so tips appreciated.