dondoucette
Too Many Projects
I've been working on this P2200 for some time now, it originally was in horrible shape as it had been gigged for years by the keyboard player I bought it from.
I'm in the home stretch and have no interest in taking any shortcuts now.
The heatsinks on one side of this amp were smashed up pretty badly, I obtained a used set to replace. I have transistors out and cleaned them up, I have new compound and insulators and thought just for the heck of it I would test gain. I fired up my Sencore TF46 super cricket and the following is what I got.
In the left column are the A909's and the right C1586's. Don't know what the gain was when the transistors were new but the spread now seems considerable.
My question; did Yamaha bother to do any gain matching or no. I have 12 of each spare transistors, should I bother to install some that are more closely matched or not bother.
Thanks for your time.
Don
I'm in the home stretch and have no interest in taking any shortcuts now.
The heatsinks on one side of this amp were smashed up pretty badly, I obtained a used set to replace. I have transistors out and cleaned them up, I have new compound and insulators and thought just for the heck of it I would test gain. I fired up my Sencore TF46 super cricket and the following is what I got.
In the left column are the A909's and the right C1586's. Don't know what the gain was when the transistors were new but the spread now seems considerable.
My question; did Yamaha bother to do any gain matching or no. I have 12 of each spare transistors, should I bother to install some that are more closely matched or not bother.
Thanks for your time.
Don