Mercury Magnetic Express transfo

[DaveWell]

HI!
I plan to built a Express, but I'm a little confuse about choosing transfo
Mercury Magnetic trainwreck direct transfo replacement are expensive, , someone got an alternative with correcte spec for a express using EL34 or even 6550?

Regards

[martin manning]

Used to be a couple of alternatives, I think this may be the only one left?
http://www.classictone.net/TW-Style-Transformers.html

[DaveWell]

Yep !
Thanks for the link !!!!

[Cantplay]

Triode also has TW iron.

John

[M Fowler]

Hammond 272JX or 372JX

I used the new MC iron just beware the sucker is bigger then any other TW Express PT I've ever used Pacific, Heyboer, Hammond, or Edcor.

Stancor would be nice

[martin manning]

Triode also has TW iron.

Triode iron is Magnetic Components. That PT is a big stack!

[M Fowler]

Mojotone sells Express PT and OT as well it's heyboer numbers.

[kwijabo]

i've never tried them, but i know people have used Edcor's in the past for at least Rocket builds. not sure about an express. you'll probably wait, though, becuase their website says they have a lead time of about 4-6 weeks or something like that.

couple words about edcor from an email exchange i had with RJ. hope he doesn't mind me sharing.
"Right away it's important to know that their voltage rating system tends to understate the actual B+ you'll get out of an amp. They use a fully loaded rating so my 280-0-280 EM0722 power transformer is going to give you 300 volts AC when you power it up and measure it without a huge load on it."

"For Output transformers Edcor uses only M6 steel...Most Trainwreck output trannies use M19 steel."

again, i've never used these, so maybe someone who's done an Edcor express could chime in.

for power, this seems like this meets the specs for an express: http://www.edcorusa.com/p/658/xpwr064_120

at least for the same impedance, this has a 6.6k primary. it has the screen taps, though.
http://www.edcorusa.com/p/436/cxpp45-ms-6_6k

[M Fowler]

I've used Edcor iron for Express both 100w and 50w versions as well as Rocket builds.

I don't find Edcor to be any different with HT voltages then the other brands. My AC mains is at 118v so lower then some of you guys.

I've been very pleased with the tone Edcor delivers.

[Turbojunkie]

I noticed the other day that Marstran has TW Power trannys...he seems to have an excellent reputation with the Marshall guys...just Power though, no Output Trannys....
http://marstran.com/MISC.htm

Adam

[M Fowler]

I think any brand a guy chooses is going to deliver, especially a good Marstran.

I don't like some of the Honduran and Chinese transformers I've seen.

[rawnster]

+1 on the Edcor option. not to mention the blue bell housing. purdy.

[DaveWell]

EDCOR seem's fine

I think the http://www.edcorusa.com/p/995/xpwr225_120 will do the job.
250 or 300 mA is the most on target ?
Classic Tone seem's interesting

But Mercury Magnetic..... is Mercury Magnetic !!!
expensive but worth the extra $$$ ???

Someone have try The Mercury Magnetic ?

[Chad]

I love Heyboer never let me down. Chad

[Kassie]

EDCOR seem's fine

I think the http://www.edcorusa.com/p/995/xpwr225_120 will do the job.
250 or 300 mA is the most on target ?
Classic Tone seem's interesting

But Mercury Magnetic..... is Mercury Magnetic !!!
expensive but worth the extra $$$ ???

Someone have try The Mercury Magnetic ?

I have a Hammond 372JX PT and Mercury Magnetics KF OT... it's expensive, but it sounds pretty good. I have no comparison other brands though. According to the local amptech (who offcourse is a MM dealer), the quality of the iron makes notes more defined and blooming, altough he also says that circuit changes have a bigger impact on sound, but so he says ''a MM OT will get you the maximum of sound out of a given circuit''... I chose for a more expensive OT instead of PT because that's the biggest impact on sound. But I am sure it differs per model. Hammond also has a 35watt push pull (HighFi) OT with 6k6 primaries... and it's 3 times cheaper...

Another Dutch forum member built 2 expresses... each one with different brands of caps and OT's... and he says that sound differences are small. Altough he had to acknowledge that in his Dumble build a MM end trafo and choke was a serious upgrade to his hammond fender replacement iron. And then you have a whole bunch of guitarists buying MM for their Marshalls and do not quite like the smoothing out sound and end up back reinstalling the original marshall Iron.

A certain change in sound might not always be better... and a supposedly 'inferior quality OT' might give better results because it attributes to the designed circuit or given sound. That is also the story by my local amptech (who offcourse is a MM dealer) He says. ''Sometimes installing MM iron has such a dramatic 'upgrade (it's always upgrade with those dealers funny enough)' on sound, that the circuit which was developed in conjunction with that given OT needs to be changed as well. So it might be the old chicken and egg story after all.