PEER-LESS OUTPUT TRANSFORMER replacement (16492)

Trelja:  I have been working on this for quite some time...I'm a little surprised at how difficult this really is.....First let me say , no ultra-linear taps.....Here are the main problems I'm running into on this, First having insulation over 1000 volts....., second being able to work at 150 watts....and have reasonable frequency response 30hz-20k......and have a separate winding for feed-back.....So transformer people can do one or the other but don't seem to be able to do it all..........Hammond cannot make it, Heyboer can make it if they have a old one to reverse engineer....I've not had good experience with Mercury Magnetics.....I can't get a hold of anyone at Magnequest or Electro-Print, which is probably good because of price........I will be calling Edcor in the morning and talking to them.....Any other input you can make will be welcome.....Will   

@autospec Will, please give Classic Tone Transformers a call as well. Both they and Edcor do custom work, and take those needs seriously. Heyboer also seemed willing, but again, my results with them fall behind the other two. The rub I had with Edcor was in setting up an account, I needed to provide them far more (government issued information - federal and state tax IDs on official letterhead) than I did with any entity I’ve ever dealt with to prove I was not just a hobbyist. I have my own thoughts on the more esoteric winders as well as ultralinear taps, but I’ll hold them for now.

In regard to your feedback winding, is it possible they get tripped up by your nomenclature? Are you actually requesting a completely separate winding, or just the typical 4 ohm tap to run your feedback loop off? If the latter, they churn them out that way all day long, and should add but a couple of dollars to a single tap output transformer. A separate output winding would be different than most audio or guitar output transformers even if their power transformers get built that way, and my question then becomes, do you truly need a solution that elaborate?

Trelja:    I ordered and received (4) of these out-put transformer from Edcor.....They look to be rather quality built........I have installed one in a 165 watt Altec Lansing 1570 power amplifier without issues.....I will be running some "square wave tests"  and at this point very happy with these transformers.............I had used them before , I thought maybe this might be to difficult for them, but after you mentioned them I figured to give them a try.............Will

@autospec thank you for following up, Will. Unfortunately, it happens so rarely.

I'm really happy Edcor could seemingly provide what you wanted.  Hopefully, they work out as you want

@autospec  I am very interested to hear your findings and know your opinion of these Edcor transformers.  I have a pair of Altec 1570Bs.  One has the original transformer and the other does not.  The replacement tranny in the one sounds fine, but it is going to melt if I run the amp beyond said transformer's 100W rating.  Thanks!!