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24.27.41.140
Is anyone still manufacturing small transformers in the West? I recently set out to buy a small transformer with a 115VCT secondary, but no luck. Everything I found in the range of 15-20VA is Chinese. Does anyone know of a source for this, either new or NOS?
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Buy Chinese. Bury freedom.
Follow Ups:
Remember those 22ga wires cannot handle the hundreds of amps flowing through a 12AX7 on transiets.
Three paralleled #8 per lead out should do it!
Only the MLP "master builders" know how to optimize magnetic lead out wires for maximum transfer efficiency.
It is a requirement of their "world class" SE tube amplifier designs.
For the novice, don't bother. You will probably destroy the component.
DT667
As a novice I destroyed one expensive transformer, two output transformers and half a dozen chokes. I personally can not hear the difference and have learned my lesson. Not antagonizing DT here as he did not bring it up. I did however learn the hard way on this particular issue.
I do still however like the 12ax7 and look forward to trying it with a mosfet follower.
"As a novice I destroyed one expensive transformer, two output transformers and half a dozen chokes. I personally can not hear the difference and have learned my lesson. Not antagonizing DT here as he did not bring it up. I did however learn the hard way on this particular issue."
JDM has extensive experience listening to some of the best transducers ever produced by Altec and others. Plus, he was with DF for over a decade at RMAF. JDM knows what to listen for and perhaps we don't know as much.
The fact that JDM has been able to "optimize" magnetic lead out wires with reported successful results underscores his skill as a builder of SE tube amplifiers.
DT667 is also NOT optimizing magnetic lead out wires in order to reduce the complexity of amplifier projects. That will be for another time.
DT667
"Only the MLP "master builders" know how to optimize magnetic lead out wires for maximum transfer efficiency. "
Only the MLP "master builders" think one needs to optimize magnetic lead out wires for maximum transfer efficiency. And they are wrong. Regular wire works just fine. In a blind test the "master builders" wouldn't be able to tell the difference.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
With the high output Z driver, it would not matter if it was 300% efficient, it still would not go full bandwidth.
So maybe it is only 150% efficient? Probably only about 143.5% if he were to measure it.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
I listen to a lot of streaming low quality audio and sometimes find the roll off starting around 12k to be advantageous. I also don't hear anything missing when I listen to the FM dial. On that note my Prius AM tuner sounds pretty good with bandwidth out to maybe 5khz. Reminds me of my low current wimp driver tube Amps at home.
Edits: 01/09/22 01/10/22
~!
The Mind has No Firewall~ U.S. Army War College.
Love the quotes. Appropriately used.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
On the East Coast. Been around sine the late 1970s.Quality products, I have used many over the past 40 years.
And they are made entirely in the USA.
Edits: 01/01/22
Looks like this is a hopeless search. Maybe some NOS transformers will show up on eBay over the next few weeks. If not, I have two older 115VCT Hammond transformers made in Canada. They're a different style and twice as large as needed, and it will be troublesome fitting them into the amps. I'll also need to insulate them somehow for safety due to the style of the terminals.
Anyway, it's not the end of the world. These are the last two amps I'll ever build of this type, and I have plenty of US-made transformers in lower voltages to use in more typical bias supplies.
Thanks for everyone's comments and suggestions!
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Buy Chinese. Bury freedom.
Signal Transformer Inc. out of NY still manufactures in the US. I am pretty sure that they also manufacture abroad. You can ask them about country of manufacture of the specific item assuming you'll be able to find what you're looking for in their catalog.
Just got word back from DigiKey that the Signal model I need is still made in Dominican Republic. I've used those before at other voltages, and they're excellent quality. Problem solved!
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Buy Chinese. Bury freedom.
I'll give you an A+ for effort and four starts each for tenacity and stick-to-itivness
It sucks to get old. It really sucks to get old and bitter.
Uncle Mike, I cannot imagine pulling the bottom covers off a pair of monoblocks worth thousands and seeing "Made in China" on the transformers. I'd rather throw the entire project into the trash.
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Buy Chinese. Bury freedom.
I take the same approach with our business. I refuse to purchase Chinese LED lighting even if I'm bidding against contractors that use it all the time.
I would rather lose a job than use that garbage.
The Bitterness of Poor Quality Remains Long After the Sweetness of Low Price is Forgotten.
-Benjamin Franklin
http://www.ogonowski.eu/transformers/single-ended/
Good good quality. Low prices. Made to order. Used by several European high-end manufacturers. Communicates in English.
I have NP Acoustics OPTs and plate chokes - all amorphous. Very nice guy builds them. He usually takes a bit off the price for me.
wound some decent transformers.
Not the best paint job but performed well.
Monolith magnetics is another source and good folks. Expensive but nice transformers
Edits: 12/31/21
How about Heyboer or Edcor. They will build almost anything, both reasonable cost.
Enjoy the ride
Tom.
Toroidy( sp ? ) in Poland 🇵🇱 ?? Postage might hurt tho...-. Have ordered from them and been extremely happy
Cheers & happy new year 🥳
FM
Ahhh ....sorry bout that ... Poland is much too far east ... but given the increasingly difficulty in sourcing transformers ... is it that difficult to wind one's own small transformer? Granted I'm speaking from a point of view of having never attempting it so I don't know whats involved.
cheers
FM
I need two of these transformers for bias supplies. Not interested in experimental products, the amps are worth thousands. Poland is OK, but I wasn't able to find the company. Actually, I doubt any specialty company is willing to make transformers this small. The original US/Canada products sold for less than $20 each.
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Buy Chinese. Bury freedom.
Their 262D12 has a 120V - 18VA secondary but also has a filament secondary as well. Don't use it if you don't need it. They say it's made in Canada which is close to made in the West.
I even wrote to Hammond asking about old stock. Received the usual spiel about quality standards of their offshore operations.
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Buy Chinese. Bury freedom.
Edits: 12/31/21
I buy power transformers and chokes from them made in Canada.
It is kinda gross. Sad.
/
.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
I looked through the info you posted, and the numbers I want are SWC-5120 (single primary) and DSWC-5120 (dual). Both are listed as obsolete and not available at Mouser. :(
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Buy Chinese. Bury freedom.
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