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In Reply to: RE: Transformer Phase Inverter - Several Questions posted by Alpha Al on July 15, 2014 at 12:58:36
I think FC is thinking of a center tapped grid choke phase inverter.
Check out the Seth 240 amp on Mikes pages.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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Yes, or at least an arrangement that would mimic (at a much lower cost) something that was designed for this purpose. Again, it just has to be good enough for a guitar amp.
Having read a long thread in the archives that degenerated into an argument about what constituted an autoformer, I was a bit hesitant to try to put any particular label on it. =8^)
If it functions well enough, I don't care what it's called.
. . . Charlie
I have used the primary of a small push pull output transformer for that purpose with good effect.The ElectraPrint PSA-2n Phase splitter auto former (that's what Jack calls them) was better for Hi-Fi though.
Mike has one also. EXO-173 PPS Ni
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 07/15/14 07/15/14
I tried a design for a phase-inverting center-tapped secondary transformer driven by a single-ended cathode follower, and found it hard to get good balance at high frequencies (above a few kHz) between the two ends of the secondary. This is probably something you should measure with the transformers you are using.
No way to measure, all I have is my ears and a DMM.
According to a chart I found, a guitar's fundamental range is roughly 82 hz to 1.2 khz with harmonics going up to about 5 khz.
. . . Charlie
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