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Old 10th August 2006, 02:56 PM   #1
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Default MC Step-up transformers

Hi there,
I am just wondering if anyone knows any good sources of information on hand winding MC step-up transformers...or would it not be worth my time to try it?
Mantisory
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Old 10th August 2006, 07:35 PM   #2
phn is offline phn  Sweden
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Do you like the idea of winding 1-2 km magnetic wire 1/4 the size of a human hair 3000 turns on a three chamber bobbin with a few pct tolerance on a core made of a couple dozen paper-thin layers? At least that's how Telefunken used to do it. That's on the extreme end. Most are not made that way.

With good to great step-up transformer around for about $100, you probably have to want to make your own for it to make much sense.
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Old 10th August 2006, 07:51 PM   #3
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where do you find a
Quote:
good to great step-up transformer around for about $100
? most i've seen have been more in the 4-500$ range for a pair...
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Old 10th August 2006, 08:27 PM   #4
phn is offline phn  Sweden
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There always seems to be some Peerless 4722 on eBay.

Haufe transformers turn up fairly regularly. T42 has a step-up ratio of 1:20, T41 1:10. My guess is that they come from old Klangfilm gear. They were used as input/balancing transformers.

All tend to bring around $100/pair. More if they are boxed or mounted.

I believe Shindo and Auditorium 23 source their transformers from Haufe. The legendary, and ridiculously high-price, Neumann BV-33 was probably sourced from Haufe as well.
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Old 10th August 2006, 08:45 PM   #5
zix is offline zix  Sweden
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Mc transformers for less than 500 dollars? How about Lundahls? They have several different winding ratios available

LL1678 1+1+1+1 : 16+16 Moving coil input. Amorphous core. about 60$ each.
LL1681 1+1 : 13+13 Moving coil input. Mu metal core. about 85$/each.
LL9206 1+1+1+1 : 10+10 Moving coil input. Amorphous core. about 60$/each.

I will shortly be using the LL1578 (not the 1578XL, I don't know if the XL will work as an mc stepup trans). The 1578 is listed as a microphone input transformer, but can be used as an mc stepup too. 1:10 or 1:5 ratios is possible. I got lucky, was offered a non-RoHS pair for less money, didn't hesitate.
All of these are probably very good. Prices for these are in dollars as I found them on http://kandkaudio.com/. http://www.lundahl.se/ is the manufacturer web site.

Or how about the Sowters?
8055 Studio Phono 1:10, "fully balanced", about 57 pounds/each
9575 1:20 Low Z, about 49 pounds/each
9570 1:10 Low Z, about 49 pounds/each
9580 1:12.5 High Z. about 49 pounds/each
All of these are also probably very good. Prices for them are in Sterling Pounds as I found them on http://www.sowter.co.uk.
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Old 10th August 2006, 08:53 PM   #6
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hmmm...for some reason i thought the lundahls and sowters were much more - i guess i had the s&b's on the mind or something
thanks!
Mantisory
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Old 10th August 2006, 08:54 PM   #7
phn is offline phn  Sweden
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I forgot the new stuff. I have never used anything but vintage transformers. I was going to mention Lundahl, but...

Jensen is another alternatives, and it's on your side of the pond.
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Old 10th August 2006, 09:05 PM   #8
SY is offline SY  United States
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Jensen is a fine alternative. Their 1:10 stepup is (IIRC) about $80.

I've got a pair of 4722s myself. For the era, they're pretty good. But at least on paper, the modern stuff walks all over it.
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Old 10th August 2006, 09:16 PM   #9
phn is offline phn  Sweden
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I wouldn't get the 4722 myself. But they are common in your part of the world.

I probably will try some of Lundahl's transformers. Like Haufe, they use amorphous core.
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Old 12th November 2006, 02:21 PM   #10
enilsen is offline enilsen  Sweden
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I don't know if Iím barking up the wrong tree here, but I've seen microphone transformers with reasonably good specs starting at about $10 and up.

I can only assume the more you pay for a transformer, the better it should be but these low budget items have got me thinking they might be able to substitute the less expensive MC step-up items.

Would I be wasting my time if I was to go out and purchase a pair of CP8201 microphone transformers .
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