![]() When you split the cathode resistors out to each channel, did you double the resistance of each cathode resistor? To generate the same bias voltage for just two tubes instead of 4, the cathode resistance for each channel will need to be doubled. ![]() But if your doing self bias for what ever reason, why isn't this done all the time? Is something being missed? I know a lot of people dig fixed bias for the many reasons. I don't have science, just the words to describe what I heard. When the left and right side where doing there own thing, TOGETHER with the shared resistor. ![]() So it sounded horrible to me and stuck out in comparison. It seemed that when left and right where doing there thing by themselves the sound was disjointed in places. ![]() This what I came up with in my head and I am no expert. I couldn't tell there was any loss in L/R stereo. Super smooth at any volume, great torque, and just really homogeneous sound. Dry, sterile, flat, slight edge on some frequency.Wheres the smooth? Where's my magic? The left and right shared version just walked all over the L/R split version. It has to be a performance upgrade right? WRONG! I fire it up and it sounds like hell. I'm totally thinking better stereo separation, dynamics etc etc. I decide to split the channels so they have there own cathode resistors. I pull the McIntosh !!! So I can listen to this one! OK so here it is, Left and right channels are on the same by passed cathode resistor. Seriously this amp is doing a lot of things well. ![]() I fix it in about ten minutes and fire it. So last weekend I pull it off the shelf and look at it and immediately see a few tiny mistakes, and the biggest one being the grid return resistor in the wrong spot causing this phase problem. My understanding of these things has multiplied by 5 and I have had several successful projects since those very frustrating early times. I was burnt out with building and failing. It was my third attempt that didn't come out that great. I built it and it had real screwy phase thing going on with it and I shelved it. I have had this amp I built sitting in the closet for a long time. ![]()
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