WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
Building, troubleshooting and testing of these amplifiers should only be
performed by someone who is thoroughly familiar with
the safety precautions around high voltages.
I kinda have a feeling someone paid to have this opt designed, maybe we'll see a project around here. I keep kicking around the idea of paying for a 32ohm opt for headphone use. The design costs are pretty low I'm surprised more people don't pay for custom opts from Edcor.
Pete, cathode follower output would be a bad idea since a cathode follower output requires the same load as an plate follower output.
Tinitus, the Softone is a "matching" transformer, actually it is not a transformer but an autotransformer, meant for better loading of OTL amplifiers.
I'm a bit surprised that Edcor doesn't state the maximum current rating for the transformer. I see that it's got an Ultralinear screen tap.
Perhaps it is designed for a bunch of little tetrodes or pentodes which are operated in parallel. Puzzling.
I ordered custom OPTs from them, but anyway they added screen grid taps. They were 100W 10K P-P transformers, who would use that taps anyway? Looks like they add ultralinear taps to all OPTs routinely.
A tad off topic - but how does the quality of Edcor XSE OTs compare with Hammond - the Edcor's at roughly $17 for 10W (and 5W for GXSE) seem to be a lot cheaper than the Hammond range (except for the rather pricey Edcore model that started this thread) ??
No, I'm not looking for equivalent exactly. Let me rephrase my question. Hammond have two ranges of SE OTs, one is top-end, the other is their economical range. If I'm being stingy (which isn't unusual ) then I start looking for even cheaper options. Low and behold I find Edcor who have an even more economical option. But then I wonder if 'I get what I pay for' I must be giving up a lot of sonic performance. So I ask those who may know, do the cheapo Edcor transformers compare with the cheapo Hammond or are they totally crap ? agains, sorry for off-topic, but this thread got me thinking about Edcor for the first time.
Bigun, maybe take a look at both home sites, Hammond and Edcor, and compare specs on frequency responses
might tell you more about what kind of quality you are looking at
other than that, I think we better get back to the special low impedance trafos presented here
be it autoformer or gapped OPT
I suspect both are best used with "parafeed" OTL designs ?
Or maybe making a stronger OTL head amp into a small flea amp ?
If being "parafeed" I suppose such SE OPT could just as well be used with PP design ?