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Re: Now we are talking...

First things first, I measured only the front end stages, loaded lighter than they would have been had the power valves grids been involved. No loop nfb, and only the gain and P-S stage was being put through its paces. NFB cleans the whole amp up nicely and to the limits of what the OPT is capable of. So flippin' what...

I found no measurable un-balance with CCS cathode load diff amps. i don't give them any NFB input and I only would publish test results which I had duplicated with good tubes, known good and NOS, and incidently some weak sounding used did still measure quite well. Good matching makes it very difficult to determine which is which at a first glance. Two identical traces...180-degrees OoP

Split load inverter is only going to have a maximum output of 25% of it's B+, and likely less when it is part of a direct coupled circuit. Between a fifth and sixth is allIcould tweak out of mine, and at published Dynaco OP points, it is more like a sixth. which for a UL rigged outut valve is just enough.

The NFB-less triode V-A and direct coupled split-load did not ever measure well, usually not even close to acceptable. More like POOR, sometimes *REALLY* poorly.
regards,
Douglas
!
Beware the man who behaves deceitfully towards others, for there is nothing else to save you from his deceiving you

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