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In Reply to: RE: correction 5.1V zeners were used ... posted by jazbo8 on January 24, 2015 at 23:56:28
I've looked at Heyboer SE 14W 25:1 vs. AES PT-31 .At 100 Hz , the Heyboer had 3X less distortion at 1W than the AES.
The bigger OPT have a definite advantage in the lower bandwidth Hz's.
With biamping, the little OPT's are good enough to use for the horns depending on where you are crossing over.
ARTA Steps can plot distortion vs. Hz and I have seen what happens to the distortion profile of a tube amp due to changes in biasing, OPT's, cathode bypass values, tube rolling , etc.
With the PC and a decent dual channel scope, you can find out a lot about what is happening with low power SE tube amp circuits.
Edits: 01/25/15Follow Ups:
You would be amazed at the difference in distortion when switching from a small "barely enough" OPT to a "serious" OPT.
This is particularly evident as overall perceived output power and bandwidth.
If you are into simulation, play with the primary inductance and/or primary DCR.
******
http://rh-amps.blogspot.com/
Certainly the quality of the OPT can effect the bandwidth and distortion of the amplifier, but, at mid-frequencies, it should have barely any distortion, unless it is defective, so I don't think this alone would explain why the measured distortion is so much higher than what the simulation suggested.
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