Edcor vs. Heyboer

[C Moore]

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You want to see the right kind of mounting for a standup transformer, take a look at the Peavey Classic 30 transformers. That's a study in strength. Take it from an outfit that ships hundreds of thousands of these things... they go with a heavy steel chassis and ungodly thick mounting for transformers half the size of the Radiospares-type 18W OTs. Kind of the Peavey way... it may not sound good, but at least it'll last forever.

This whole thread has been interesting. But I think we can all, at least, enjoy the humor from above.......

[David Root]

I hadn't fizzed on it before, but also see how the Edcor bell enclosure extends around the laminations. That is an old time thing you will see on some makes, not all. The big Edcor I have (11 lbs, OT) is the same design.

I would think that is a plus, but does it have any strengthening effect against shear stress on the feet? Maybe it does?

[RJ Guitars]

I was also thinking back on my earlier experiences with Edcor considering some of the input from Krash.

Edcor is a small Mom and Pop organization (literally) and I think everything is hand wound by the same person that takes the orders and packs stuff up for shipping.

I recall trying to get some transformers wound for the Trainwreck Rocket builds. I gave them my preferred specifications and they gave me a quote for this giant transformer set that would have required a 10 inch wide chassis to accommodate and a full time roadie to lift the thing. What I didn't understand at the time was that if I had asked for a slightly smaller heater current, they could have wound the tranny I needed on a smaller core. I kinda gave up on them at the time and we went with trannies from Heyboer on that build.

Sometime later my "tube amp mentors" HiFi gurus continued to sing their praise and persuaded me to try them again. I got them to wind me a set of reasonably sized transformers for a 35 watt amp and they turned out excellent. At that time they clued me into a Volt-Amp capacity (limit) that each transformer size will support. If you sum up the power needed to run each winding at the peak requirements you can use that info to derive a VA number for a transformer. If you keep that VA number within the VA limit, they will wind you a tranny to your specs.

FWIW - What I understand is that VA limit has to do with how much heat a given transformer size can dissipate. You can make trade-offs and give up heater current to get more B+ current etc..

Once I did get get some of their transformers it was immediately obvious that these they were very well made and terrific looking transformers. I still work at it to communicate to them the guitar amp perspective but the results have been worth the effort.

rj