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In Reply to: RE: Since parafeed is the "new kid in town" posted by Paul Joppa on November 22, 2016 at 13:45:25
I have purchased several pairs of SE OPTs for amp projects and they are all gapped. So, i was wondering about their suitability for a parafeed circuit. It was not clear from the schematics that i read about the specs for the output trans. If the se opt has the proper primary impedance. regards, Dak
Follow Ups:
The gap is to avoid core saturation from DC. If you don't put DC through the core (parafeed) there will be no saturation to avoid. The downside is that gapped SE transformers have to be comparatively bigger with more turns and thus more expense compared to a non-gapped opt designed for SE parafeed for the same power output.
Yes, i know what the gap in an SE opt is for. But, i wondered if i could use the opt that i have on hand which are SE and PP instead of shelling out more cash for a specifically designed parafeed opt. Which of course, i would rather avoid. tyvm
Did you read my subject line?
Might I suggest that you take one of your gaped SE xfmrs and restack them without a gap (solid core). The inductance will go way up and they will work well as PF xfmrs.
It seems that when they varnish the unit it glues all the lams together. Also i spent a lot of money initially and don't want to ruin them. Maybe i will play with some cheap el84 unit first. thank you for suggesting.
Pulling lams out of a finished transformer which has been waxed or varnished is, as you've suggested, a very, very difficult undertaking.
Almost always you will not get back in the same number of lams as you've yanked out when stacking alternately (say 1x1).
If you bend or tweak the lam in getting it "unglued" and pulled out... it should go in the trash can. Lams (especially high perm materials) are very strain sensitive and their magnetic properties subject to degradation if bent or tweaked.
If you have a nice SE airgapped output... keep it... don't monkey with it.
For many projects you can get nice parafeeds for not a bankroll of money.
MSL
Builder of MagneQuest & Peerless transformers since 1989
Just as i suspected. In the past i have tried to "straighten out" a power trans which had crooked lams because it must have been dropped. I could not get to straighten out the lams. And i really tried hard. I won't describe the process but decidedly caveman style. Even after that i am using the trans and it works great but there is a little buzz when the current use is high.
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