New Edcor opt, what would a 150ohm primary be used for?

[athos56]

I saw this on the Edcor new product page, what would you use this transformer for?

EDCOR Electronics Corporation. CXSE25-8-150

Athos

 

[pmillett]

Cathode follower output?

 

[tinitus]

here's another one
Softone Matching Transformer MT-72 & MT-128 for SEPP Amplifier

 

[JLH]

How about a FET follower?

 

[rotaspec]

Could be nice with 4x EL86/6CW5 in parallel SE.

 

[athos56]

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.

 

[807tubenut]

I do, every chance I get.

 

[pieter t]

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.

 

[Frank Berry]

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.

 

[Wavebourn]

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.

 

[pieter t]

Yeah, the winding machine will stop automatically reaching 40% of the turns...

 

[wrenchone]

I think this was one intended for use with Ixys depletion-mode mosfets in a transformer-coupled version of the "Delite" amp introduced at the 2009 Burning Amp fest.

 

[Gordy]

Parallel 6C33 ?

 

[pieter t]

Gordy,

6C33 would mean 4 of them (each 6C33 likes to "see" about 600 ohms).
The transformer is rated for 25 watts, and the PPPPSE 6C33 amp would yield 40 watts or so...

 

[Bigun]

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) ??

 

[tinitus]

A tad off topic - but how does the quality of Edcor XSE OTs compare with Hammond

I think you need to compare with CXSE series, to get a fair figure

 

[Bigun]

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.

 

[Pano]

Search a bit and you'll find several old hands here who prefer the Edcor OPT.
I have not compared them A/B, but the Edcors are OK by me. Ditto the line level iron.

They really are superb value for money.

 

[tinitus]

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 ?

 

[Enzo]

If it were designed with MOSFETs in mind or for cathode follower duty, why would they label the winding leads Plate and Screen?

Why not contact Edcor and ask them what it was designed for?