Musical instrument amp scenario reduce tube count
Posted: Thu Jul 30, 2009 8:05 am
Hello all,
I am considering the Poseidon board for a musical instrument application primarily for an organ or even a bass guitar. Now I have noticed that the schematic shows a 12AX7 and a 12AU7. I am wondering if the first 12AX7 stage could be done away with and use a 12AX7 in place of the 12AU7 for the VA/splitter stage.
Considering that the amp is mono I would have to create another tube socket just for the use of half a 12AX7. In a hi-fi stereo amp I would leave the design as is, but here I would be wasting 1/2 a tube and would have to drill another hole for a tube socket. Now, I am wondering if these minor changes could be made and if it would still work properly as a driver for 6L6, KT66, or 6BG6G tubes. My concern is if I have to change anything in the LM334 area to compensate for the use of a different gain tube in that location.
Thanx,
Geo
I am considering the Poseidon board for a musical instrument application primarily for an organ or even a bass guitar. Now I have noticed that the schematic shows a 12AX7 and a 12AU7. I am wondering if the first 12AX7 stage could be done away with and use a 12AX7 in place of the 12AU7 for the VA/splitter stage.
Considering that the amp is mono I would have to create another tube socket just for the use of half a 12AX7. In a hi-fi stereo amp I would leave the design as is, but here I would be wasting 1/2 a tube and would have to drill another hole for a tube socket. Now, I am wondering if these minor changes could be made and if it would still work properly as a driver for 6L6, KT66, or 6BG6G tubes. My concern is if I have to change anything in the LM334 area to compensate for the use of a different gain tube in that location.
Thanx,
Geo