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Post by pedr0666 on Aug 26, 2006 5:18:44 GMT -5
Hi Jerry,i have the 5150 with block letters and have done the bias mod which is running just under the recommended max setting.I have a very low gain pre-amp tube in the centre tube slot.Now the clean channel is a little better but without chorus and delay it sounds like me plugging my guitar into a car stereo,its just awfull.Now ive heard of people putting a really low gain valve in the 1st postion instead of middle postion,is this a better option?i know id lose some overall gain but the 5150 has a ton of it and i only ever run it on 4-5 anyway with no external distortion devices.Any advice would be great
cheers pete
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Post by Jerry P on Aug 29, 2006 9:34:41 GMT -5
The 5150 clean channel will never sound great. The clean channel runs thru 6 gain stages so it's always going to have a little grit to it. Running lower gain tubes can help a little. I would try the lower gain tube in the first spot, farthest to the right looking in from the back. Running a 12AT7 in the phase inverter spot helps too. That's the preamp tube closest to the power tubes. Plugging into the low input jack and/or rolling the guitar volume down a bit helps too. Jerry
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