Peavey welds down a lot of their transformers, apparently without harm. But I don't get the point, when there are stronger bolts holding it together. If that's not enough, a plate across the top and two clamping bolts should work.
But admittedly, the amp probably fell some distance.
But admittedly, the amp probably fell some distance.
The black pigment in black paint is often carbon black. Fwiw. Not a terrific insulator, if that matters... wondering what the factory coating on lams typically is?
indeed been doing it for years.....this is a 100v power traffo for a Luxman LV-105 which i converted to 220 volts just the other day....
This did have me wondering as I have been looking into rewinding some salvaged transformers so that I can build some bench supplies. I have read that the laminations must have insulation on them and therefore must not be scratched when youre taking the transformer apart, and yet ive seen a few now where the lams are welded.
It's annoying as I've got a few 100-120VA transformers (I think) from old "midi hifi" systems that'd be perfect if re-wound! I've also noticed a few with mounting brackets welded onto them, and wondered why this doesnt caiuse a short. Now i know 🙂
It's annoying as I've got a few 100-120VA transformers (I think) from old "midi hifi" systems that'd be perfect if re-wound! I've also noticed a few with mounting brackets welded onto them, and wondered why this doesnt caiuse a short. Now i know 🙂
First and foremost we are talking about Microwave TXs, which are of a suitable core size....and perhaps key....non-interleaved laminations. Taking apart interleaved cores is a royal PITA. Once apart interleaved really don't want to go back together...& always when re-assembled the stack is larger than original...yes we could eliminate a few lams to fit but it seems it never gets tight enough. Perhaps it is not as bad as I have experienced, and others have had successful results.......but not me.
______________________________________________________Rick.......
______________________________________________________Rick.......
^in my case. 2 pcs of lams did not make it back into the traffo, it made no difference....the traffo i posted had its lams slightly smaller than a standard scrap-less EI 1 1/4 lam but outside dimensions were the same as with an EI 1 1/4 lam....so that it left me no choice but the reuse the cores......
grinding out the welded portion smooth so that the lamination separated quite easily did it for me.....if you have been working on these transformers you will know what i am talking about...
while going around the welded lams is indeed a royal PITA, working on the coils is very easy as the bobbin for the primary and secondary winding can be pried apart and only the primary winding is touched, i left the secondary coils alone....
at 100 volts i counted 220 turns #19awg, so that 506 turns of #22 awg magnet wire is wound on the primary bobbin for 230 volts ac input...
grinding out the welded portion smooth so that the lamination separated quite easily did it for me.....if you have been working on these transformers you will know what i am talking about...
while going around the welded lams is indeed a royal PITA, working on the coils is very easy as the bobbin for the primary and secondary winding can be pried apart and only the primary winding is touched, i left the secondary coils alone....
at 100 volts i counted 220 turns #19awg, so that 506 turns of #22 awg magnet wire is wound on the primary bobbin for 230 volts ac input...
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