Head-Fi.org › Forums › Misc.-Category Forums › DIY (Do-It-Yourself) Discussions › Need a toroid transformer with 46.4VAC output with 110VAC input
New Posts  All Forums:Forum Nav:

Need a toroid transformer with 46.4VAC output with 110VAC input

post #1 of 11
Thread Starter 
Hello,

The title says it all. I bought a Melos phono stage, but the power supply was not included and I have to buy one. I need a toroid transformer that has an input of 110VAC (US, Canada home power) to 46.4VAC output when powered on and 6 VAC when powered off (supposely to keep the tube warm (!?)).

Here's a picture:



Where can I buy this?

Thanks
post #2 of 11
This could be tricky to get. Maybe someone knows source - else you could custom order a toroid. There was once a thread here or on headwize about custom built toroids (it was about extra high quality ones, but they could surely also do nonstandard voltages)
post #3 of 11
Hammond makes a bunch with 44VAC windings which is surely close enough. PartsConnexion stocks them.

The 6V winding will need to be through a separate 6V transformer that is just not connected to the switch. Why you want your tubes on all the time is beyond me ...

Also, if you need to build a whole PS and not just replace a transformer, then you really want an EI for a tube stage. The lower bandwidth acts as a noise filter. Toroid power transformers and tube amps are not an ideal match.
post #4 of 11
Thread Starter 
Quote:
Originally Posted by dsavitsk View Post
Hammond makes a bunch with 44VAC windings which is surely close enough. PartsConnexion stocks them.

The 6V winding will need to be through a separate 6V transformer that is just not connected to the switch. Why you want your tubes on all the time is beyond me ...

Also, if you need to build a whole PS and not just replace a transformer, then you really want an EI for a tube stage. The lower bandwidth acts as a noise filter. Toroid power transformers and tube amps are not an ideal match.
Melos is an hybrid SS/Tube concept. What's an EI?

Yes I need to buy a PS, but it's a toroid transformer, a box, a 8din connector and a switch. Find me something simpler and I'll take it.
post #5 of 11
Quote:
Originally Posted by larryminator View Post
What's an EI?
post #6 of 11
Antek (http://toroid-transformer.com/) does custom windings.
post #7 of 11
Thread Starter 
Quote:
Originally Posted by rockcod View Post
Antek (http://toroid-transformer.com/) does custom windings.
I already contacted them

About PartConnexion, which on the is 44VAC one? I can't find it.
post #8 of 11
There are 4 of them in the Filament - 115VAC - Open Style section (marked 44V CT)
post #9 of 11
im not 100%sure on the melos phono stages, but their ****** headphone amp has such aggressive filtration in both the tube and the output stage that i doubt there is much difference in the ei VS toroidal transformer. of course the EI would leak EMF...

im calling it the ****** headphone amp until i can figure out whats wrong with mine...
post #10 of 11
Thread Starter 
Still looking.

Antek are not answering me.
post #11 of 11
Do you know how much power (VA or W) you require? Antek responded to my e-mail fairly quickly just a couple days ago asking about shipping some of their premade models.

You would probably be okay with a 2x22V or even a 2x25V transformer wired in series. Look at Antek's range and choose something like the AN-2222 which should be lightly loaded and make around 43VAC. Or you could try the 50VA 25VAC transformer which should get pulled down a volt or two to near 46.4VAC.

Note that Antek's transformers are spec'd unloaded instead of at full load like most...this seems odd to me...
New Posts  All Forums:Forum Nav:
  Return Home
Head-Fi.org › Forums › Misc.-Category Forums › DIY (Do-It-Yourself) Discussions › Need a toroid transformer with 46.4VAC output with 110VAC input