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Hi Mike and hi to the forum.
I have a pair of TL-404s I procured from Mikey many moons ago. Since I need to scrape up cash for a fancy new 301 plinth, I figured I'd list these here for the MQ community to have first grabs.
Seems ML isn't winding these at present, probably cause they are a pain in the tookus to wind.
They have the 4 ohm tap, as I understand some variations did not.
$375 shipped priority box.
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Free your mind and your ass will follow -- Parliament/Funkadelic
Follow Ups:
Joe:
I just noticed... yours have no mounting brackets... so they must be from an early, early run (perhaps first?) of these. How did you mount them?
Also... nice photo... I have appropriated it for future use!
MSL
Builder of MagneQuest & Peerless transformers since 1989
Joe, Mike;
I have these also, they were the first models you made Mike. I think that I could start an MQ museum here with all the stuff I have.
Joe you going to Rocky Mountain?
G.
J. Gordon Rankin
Well, Mikey, looks like you mooked me on the mounting brackets. I'm glad you finally decided to come clean!
I'll ask the Pope to forgive you when he visits Philly next week.
Yes, these were one of your earliest TL-404 pairs.
I never had them in an amp. I used them to drop the level of a tweeter for a week until I decided to skip the tweeter and EQ the horn. They worked great for this job, even though it is a bit of a waste of a highly developed part.
They are still basically new with uncut leads. I stripped off 1/4" insulation on three wires.
I'm at jroberts prismnet com if anybody is looking for me.
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Free your mind and your ass will follow -- Parliament/Funkadelic
To drop the level of a tweeter! That's a new application! How did you do that?
Thanks
Oldest application in the book for an audio autoformer. Tie your tweeter to a low tap and hook amp to a higher tap, voila step-down.
Now the reflected impedance to the amp will be higher, but you can use a resistor from the high tap to ground to put the impedance seen by the amp where you want it.
All of the big transformer houses made parts to do this.
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Free your mind and your ass will follow -- Parliament/Funkadelic
Hi Joe:Long time... hope all is well for you! Drop me a line at acrosound@aol.com so I can catch up a bit with you.
Re: TL-404's. I do have in stock some TL-404 XL (larger core than std).
Please provide your buyer with hook up instructions... or if your the buyer do a search on this forum for TL-404 Hookup.
And yes... they are a challenging design to wind... many reversed windings, multiple paralleled primaries, multiple interleaves btwn pri and sec windings, multiple wire guages, different amounts of insulation in coil (to balance the winding capacitances)... good stuff. And all designed nearly a decade before I was born.
Bandwidth from 20 hz to > 100Khz (+/- 1db) as tested by an end user in Italy. Check out http://magnequest.blogspot.com/ for more detailed test specs.
MSL
Builder of MagneQuest & Peerless transformers since 1989
Edits: 09/10/15 09/10/15 09/10/15
Mike,
I hope you had a great vacation.
You've got me wondering about those TL-404XLs. Can you provide a link to more info on those? Are they C-core?
Thanks,
Matt
Hello Matt:The impedances and taps are the same as the "regular" TL-404. The only difference is that the XL has 33% larger core.
All of the current 404's are built on c-cores. The originals were built on special (and long ago obsolete) Westinghouse pattern EI stamped lams.
MSL
Builder of MagneQuest & Peerless transformers since 1989
Edits: 09/10/15
Mike,
So instead of a 2W rating it's 2.6W? What is the application that benefits from that little boost?
Matt
A hair over 3.5 watts - power goes as cross section area squared.
> > What is the application that benefits from that little boost?2.6W amps!
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Free your mind and your ass will follow -- Parliament/Funkadelic
Edits: 09/11/15
Joe,
I know we are talking about real power now. But given Mike's conservatism the 404 is probably good for real world 3Ws anyway, and the XL is probably good for 4Ws.
I'm building an amp for a college daughter and it's headphones over speakers any day, so one autoformer to rule the world has me thinking. Not sure that I want a big bottle 2A3 out in the open but an E55L spud is nice and stout. I was just curious about the XL demand, and yes I'm american so I know more is always better.
Matt
Three watts! Holy moly! Don't blow anything up!! Wear earplugs!
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Free your mind and your ass will follow -- Parliament/Funkadelic
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