Edcor Transformers

[whitelabrat]

I'm starting a thread for folks to list specs on any Edcor transformers that they would like to list. The website is very sparse. So here's what I've got. They will do just about any customization for an extra $20 which I find amazing.

Pricing may vary as this thread ages.

XPWR009: 120 v 60 Hz primary, 275-0-275 175mA, 6.3V 4A, 5V 3A Cost is $51.15 each.
XPWR005: Secondary is 330-0-330VAC at 180ma , two 6.3V at 2.5 amp windings. Primary is 120VAC 60 Hz.

I'm considering having a 600 ohm to 8 ohm CXPP made, minus the ultralinear taps: CXPP25-8-600-SP

[Boris_The_Blade]

Great idea whitelabrat! Also, Phyllis is usually very helpful and can list designs off the top of her head. Usually, if the transformer isn't something crazy, they've already done it and have a part number for it so no NRE fees.

[chrish]

Not sure of the part number, but I ordered some of these custom design:
2x120 volt primary, 330-0-330v 200mA, 6.3v 5A, 5v 3A secondary.
Cost, $63.51

[TubeHead Johnny]

I always thought their PT's listed were a bit on the lightweight side. How about something like this:

400-0-400 @ 500 mA

6.3 VAC CT. @ 10 A.

Hammond has a similar PT, but with a 6 A filament winding. What good is that with 4 KT66/KT77/6550/KT88 tubes?

[sorenj07]

For a power supply that big, I'd suggest just building monoblocks. You'll end up with something that you can actually carry

[TubeHead Johnny]

Too late. I've already built two. Weight isn't really an issue (about 60 LBS). I usually have my trannies custom wound, but as you know that can get rather pricey.

[Ty_Bower]

Originally posted by whitelabrat
I'm starting a thread for folks to list specs on any Edcor transformers that they would like to list.

Great idea! Here's the two you mentioned, plus a couple that Phyllis mentioned to me when I spoke with her today.

XPWR009, 275-0-275 @ 175mA, 6.3V @ 4A, 5.0V @ 3A ($51.15)
XPWR007, 275-0-275 @ 200mA, 6.3V @ 6A, 5.0V @ 3A
XPWR017, 275-0-275 @ 250mA, 6.3V @ 5A, 5.0V @ 3A
XPWR008, 300-0-300 @ 200mA, 6.3V @ 4A, 5.0V @ 3A ($57.33)
XPWR005, 330-0-330 @ 180ma, two 6.3V @ 2.5A
XPWR041, 340-0-340 @ 120mA, 6.3V @ 4A, 5.0V @ 3A ($51.01)
XPWR???, 370-0-370 @ 200mA
XPWR033, 380-0-380 @ 200mA, 6.3V @ 5A, 5.0V @ 3A ($59.48)

What are peoples' experiences with the Edcor power transformers? I've heard that Hammond 200 series PTs have a reputation for mechanical buzzing. That's a big turnoff for me. Are the Edcors solid and silent? Do they actually make rated voltage, or do they tend to run high like the Hammonds?

[coolmaster]

Been using Hammond 300 series PT's in my DIY monoblocks for 4 years now. No buzz or noise whatsoever. 300 series have universal voltage input taps. Highly recommended if output voltage./current capacity is suited for your circuit. I would have been comfortable if it was 375-0-075 / 200mA or more but only offer 175mA model.
Am also using the Hammond output and its absolutely amazing. Just have to alter the negative feedback circuit and component values to ensure a flat frequency response.
No, I'm NOT a Hammond fanboy but very pleased with the product.

[SpreadSpectrum]

I paid the $20 on this one. I haven't had the chance to fire it up yet, but I think it will be very good for experimenting. Needs a bridge rectifier, though, so pure tube rectification is out unless you are a masochist.

XPWR052

120V 60Hz primary to 400V 500mA
tapped at 400, 385, 375, 365, and 0 Volts

Sorry, no filament winding, though. I went with a separate filament transformer so that I can put my standby switch on the primary of my power transformer.

[Ty_Bower]

Originally posted by coolmaster
Been using Hammond 300 series PT's in my DIY monoblocks for 4 years now. No buzz or noise whatsoever.

I'm very tempted to just buy a Hammond 374BX and be done with it, even though they cost a lot more. Unless, of course, someone can tell me the Edcors are as quiet as a mouse...