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Nil Satis Nisi Optimum
@Rocker I would like to know myself!!!
Why did the transformer blow? Because there is a reason these amps retail for less than the combined cost of the parts!
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Keep a look out on Ebay - a lot of people upgrade the OT and some of them sell the original. Or get one of the upgrade ones...
There are quite a lot of other amps that use the same basic spec too, it shouldn't be hard to find something that works.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
"the Chinese are able to replicate most things in this world, but they can seem to build decent transformers"
Hmm? A fair proportion of my time at B's was spent fitting transformers, OPT and PT, from various mnfctrs* and then driving the bollocks off them. Mains at +10% (253 V for UK) and pink noise at 3dB under rated power 'forever' . Eventually a fuse blew or a valve (they are shit) failed,THEN a fuse blew!
Twas only in the last month or so of my time there that I had an OPT fail (in an HT-60 IIRC) . All the traffs met ratio specc very well and passed heat rise tests. I even rigged a gadget to A/B them, live, with the originals and even seasoned, 'golden eared' players could not tell them apart.
No idea of the factory's 10-20s but all the boxes had 'Oriental' script on them.
*Because in business you do not want to put all your supply eggs in one basket!
Dave.
I replaced it with a Hammond (125DSE I think) and put it in a drawer somewhere. If you want it let me know.
There were a few other issues with the early ones as well, and a whole cottage industry grew up modding them. A year or two later they produced a revised version that incorporated the important mods that everyone was doing, and had an output transformer with the correct impedance for an EL84. I had an early one, and being reasonably competent with a soldering iron, did the mods to it myself.
It would be a lot easier to get a replacement Hammond transformer than mod it for a 6V6 power valve. From memory, you need to drill a couple of holes for screws in the chassis but apart from that it's a straight swap.. The valve change would have all kinds of complications. The 6V6 doesn't use the same socket as an EL84, so you would have to replace the valve socket with an octal one. Given that the valve socket is PCB mount, it would be a nightmare to do. The octal socket is bigger and enlarging the hole in the PCB would cause all kinds of problems and probably cut traces on the PCB. You would probably have to find a place to chassis mount an octal valve socket, and then runs wires to it from the PCB.
The transformer that I've got would give you a functioning amp, but with the caveat that it's probably not ideal.
Even a 2:1 mismatch is usually acceptable, and the difference between a 6V6 and an EL84 isn't as much as that.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
http://uk.rs-online.com/web/p/audio-transformers/1237242/
Going to be the thick end of 40quid with VAT but I never had an RS supplied traff fail in 30 years of fitting them in radios and tellies. Made by OEP and there are other outlets for their products which might be cheaper than RS.
Take no notice of the 3 watt rating, that is probably for 1percent THD and that is 'hi fi' for guitar amps!
Note! You cannot use any kind of push-pull OPT designed for two valves.
oops! Just noticed. 'on back order' But, as I said, lots of peeps do OEP traffs, in fact they are nice people and if you are really struggling to get one I bet they would help (I got two 10k line bridging traffs from them as samples some years ago) .
Dave.
Let me know if you want one as I'll be grabbing a couple for myself soon.