Model T transformers

[anson]

hi guys, I'm considering making a 70's era Model T clone and have come to a road block when it comes to the transformers. does anybody know anything about the output and power trannies of the Model T?? I haven't been able to find anything on the web that seems to be a suitable replacement, but may I'm looking in the wrong places.
thanks folks!!!!!
Anson

[loudthud]

The Hammond 278CX and 1650T will be pretty close but the mounting is totally different.

[anson]

Actually it turns out that I can get both those transformers pretty cheap from someone I know. Actually I'l be getting the 378CX because I'm in australiua and need a 240 v (or was that 220??) conection. But do you know if those trasformers will definately work? I mean, do you know anyone that has tried them sucessfully? Don't mean to be doubtful of your knowledge, but I just don't want to be stuck with trannies I cant use. As far as the mounting goes, since Im building the Model T from scratch, I will have to improvise all the mounting on the project box that I buy anyway, so of course the mounting don't matter a bit.
Anson

[loudthud]

With the 378CX you get a bias tap but it will take all of the -80V to idle the 6550's down where they need to be. The B+ will go pretty close to +600 without a load so you will need to use series connected caps. The one place the 278CX/378CX come up short is current rating of the heater winding which is only 6 amps.

The Model T is not a project for someone without a great deal of experience. Ultra-linear amps are tricky to get working properly so you really need a function generator and an oscilloscope. With the 1650T you won't have a 16 or a 2 ohm tap so that is one limitation. Kevin O'Connor (London Power) used this combination in several projects in his series of books. The books are expensive but a good investment. I'm building an amp right now using a 1650T and a Traynor power transformer that is similar to the 278CX.