Finding or making transformers

[carebare47]

Hello,

For the last few years I have been meaning to start building some valve guitar amplifiers. I've got schematics worked out and I've found suppliers for all the parts that I need, except for the transformers.

Each amplifier needs:
A Power Transformer: Primary: 240v. Secondary: 6.3v @ 4A & 260 - 0 - 260 @ 400mA (ish).
and
An output transformer (50 Watts, haven't worked out specific specifications yet, I'll get around to it)

Including shipping, these transformers are going to be at least £50 each. The project has a limited budget, and thus I don't want to spend £100 (minimum) on transformers. I would like to start winding my own transformers (I have both the time and the patience), but I cannot find anywhere that will sell EI laminations and bobbins to make my own transformers.

Can anyone help me locate a supplier of EI core laminations (or if not, point me in the direction of cheaper transformers)?

Thanks,

Tom

 

[(*steve*)]

If nobody here can help you, you may want to head over to www.diyaudio.com. I saw some discussions there about valve amplifier power supplies, and there may be people there who have faced what you're facing.

 

[Rleo6965]

Try RS Components.

 

[alfa88]

You might be better off by looking on Ebay for a bargain. I hate to be discouraging but from what I've looked into the prospect of output transformer winding looks overwhelming. For one thing you need to wind onto a bobbin and then assemble the core afterwards and torroids are not suitable. There are a few output transformerless(OTL) designs out there but it appears that they are lower power and use more valves.
You might be able to use a more available transformer for the power supply.