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Hum, review, KT88's Rp and 300B's

Steve,

First the interaction with Bob's system and the Gemini required only that the chassis be connected to the ground of the RCA instead of earth ground. Big deal, it only happened because of Bob's system and the routing of power and cabling in this setup.

As some of you may know and others not the KT88 and 6550 where co-designed by TungSol and GEC. The fact as we know that any two plants that make the same tube sound differt is the only reason for their difference. The Rp for the KT88/6550 in triode mode is very similar but when used in this manner is not nearly as linear as the 300B or have the power capabilites because of the limited biasing area in A1.

When I was in college we were taught that using Pentode/Tetrodes in triode mode was a waste of time. We were shown the results of amplifiers in spectral, distortion and output power. It was a pretty shocking study that concluded to me at least that tubes work better as intended instead of other ways.

If we use the KT88/6550 in Pentode/Tetrode configuration the Rp is 12-27K depending on the operating point. Very much higher than the 300B.

Of course one of the best things about audio is the fact that none of us listen the same way. Some may prefer this sound over 300B's in the same arrangement, that what makes it interesting.

Steve, no one is right or wrong except the customer.

Gordon
J. Gordon Rankin, WA



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