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09-13-2018, 08:06 PM
Hi Tom,
I edited my post to make it a little more clear what I was talking about. According to the RCA tube manual I should have been getting somewhere around 88 watts RMS since there are four 7868's in use and a pair should be 44 watts, and I only got 55 watts, but as I said, I measured that with the signal on the scope completely clean. If I measured it at the 5% distortion that MI amps are often measured and quoted at, then I am sure it would be higher. I'm not sure how to tell that it is 5% distortion as opposed to say 7% or 3% though without a distortion meter of some sort, which I don't have.
Greg
I edited my post to make it a little more clear what I was talking about. According to the RCA tube manual I should have been getting somewhere around 88 watts RMS since there are four 7868's in use and a pair should be 44 watts, and I only got 55 watts, but as I said, I measured that with the signal on the scope completely clean. If I measured it at the 5% distortion that MI amps are often measured and quoted at, then I am sure it would be higher. I'm not sure how to tell that it is 5% distortion as opposed to say 7% or 3% though without a distortion meter of some sort, which I don't have.
Greg
