
Badronald
New member
the4thlast1":32yygu01 said:RJF":32yygu01 said:The 5150 has a fixed bias
The 5150II (6505+) does not have a fixed bias...It has a bias trim pot on the outside of the amp near the power tubes. It also has bias test points on the rear panel. The sweep on the bias trim pot is small but I find the 5150s in general to sound good with a low to medium bias setting (not super low) but not high either, it starts to get undefined if you get the bias up high where some other amps might sound find this amp shines in the 20ma per tube range.
The ISP decimator II is hard to beat, it works great in front of the amp. The ISP G-string also works great. At the moment my live rig has two Decimator IIs one in the loop and one in front. I would be fine with just one in front to kill feedback but its nice to also kill the hiss after the preamp.
Regarding the bias, that is what I understood. The controls are on the back. Not sure what the other guy meant....