Bash_Man
Well-known member
so after figuring out bios in 50watts mode and 100watts mode, etc.. I have a couple some questions:
1 - When biasing the amp in 100 watts mode (full power), I can bias the tubes to approx 34mA (Plate voltage is 490). however when I switch the amp to half power mode (50watts), it seems to lower the bias rating on the 2 outer tubes. The 2 middle ones dont measure anything with the Multimeter. so in this case, do I bias it to the "recommended" bias (34mA) at the mode i am staying with full time? or do I bias it at that at 100watts mode and let it do the "math" it self when i switch it to 50watts mode?
2 - When switching between 50 watts and 100watts, do the 2 middle power tubes still get used? or do they just turn ON, heat up and have no involvement in the tone/sound, etc.. ? Reason I ask this is.. when it comes time to swap tubes out and I use the amp in 50watts mode, can I simply swap the tubes around (put the 2 middle power tubes to the outside and vice versa) and pretty much have 2 "fresh" tubes in the middle?
Thanks
1 - When biasing the amp in 100 watts mode (full power), I can bias the tubes to approx 34mA (Plate voltage is 490). however when I switch the amp to half power mode (50watts), it seems to lower the bias rating on the 2 outer tubes. The 2 middle ones dont measure anything with the Multimeter. so in this case, do I bias it to the "recommended" bias (34mA) at the mode i am staying with full time? or do I bias it at that at 100watts mode and let it do the "math" it self when i switch it to 50watts mode?
2 - When switching between 50 watts and 100watts, do the 2 middle power tubes still get used? or do they just turn ON, heat up and have no involvement in the tone/sound, etc.. ? Reason I ask this is.. when it comes time to swap tubes out and I use the amp in 50watts mode, can I simply swap the tubes around (put the 2 middle power tubes to the outside and vice versa) and pretty much have 2 "fresh" tubes in the middle?
Thanks