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RE: 38H OPT for 845, so so?

So that's 3.8 henries per Kohm, in the "acceptable" category but less than typical.

This assumes that the 38 henry measurement is accurate in the bass. It's remarkably easy to measure an unrealistic value for output transformer inductance. A typical meter with an inductance measurement works at 1000Hz and a few volts; this does not make enough magnetic flux to get the inductance to its stable value, at least for grain-oriented silicon iron cores. You need a lower frequency (below 100Hz) and a higher voltage (above 10 volts) to get there, in my experience.

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