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Monolith Magnetics

I doubt Monolith Magnetics is a tiny shop. At least from what I've seen on their website. I think a quality output transformer makes a big difference in sound quality, perhaps more so than output tubes. This has been my experience.
 
It seems less than 20 employees, information is scant.
Like I said above, "Making a transformer is easy, making a good one is difficult."

If they are unique, and reputed, go ahead.
Your own requirement may not interest a big maker, unless it is a standard part.
 
If you do a "search everywhere" forum search for "Monolith Magnetics" you can see that a few users here have used them in their amps. All seem to have a positive experience. Member Magz had them make him some large custom OPT's for his huge 200 watt SE 833A amp. He has posted several very positive comments and you probably couldn't ask for a more difficult transformer design.
 
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It seems they have specialized in transformers for tube amps, a very obscure activity for most, given the low volumes, compared to other end uses.

They are claiming sonic best for nano crystal, amorphous and other cores, which is a little confusing.

But like I said, it is for you to find out the reputation, and order one, based on your design of amp.
It might make your job a bit easier, than having a custom unit made.
It seems they do make custom designed units also.
 
I'll do that search, George, thanks. I've used Electraprint OPT in my wifes TLSE ver.1 and she very happy with them. I replaced the One Electrons on my TLSE ver. 2 with Hashimotos and it's a very good upgrade. I have 2 finished boards ready to go and I'm looking for something new to try. That's without breaking the bank, like in some Tango models.
 
Contact person is Yves Pexters
Email: sales@monolithmagnetics.com

If you paid for your transformers, he must have sent you a proforma invoice. There is also a phone number listed. Check your spam folder, you’ll have to be patient. They answer emails about once a week or once every 2 weeks. Short of that, since you are from Croatia, it is a shorter trip to Belgium than it is for others who don’t live in Europe ;-)

Best,
Anand.
 
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They're in all of the amps and line stages i have built over most of the past decade. I could not recommend them more highly.

Yes, I think they are extra good quality, but it is uncommon (to me anyway) to be that 'passive' with customer support. I ordered ITA01/35mA interstage transformers (amorph core) for my GM-70 tube amps.
 
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Hi,

Yes, they are still in business but they are very busy. I ordered ITA-01 35mA from them and they delivered. I waited about 2 months for them and I am very happy with the product!

Anyway, they were very slow with emails etc ...

Regards
 
Hi,

Yes, they are still in business but they are very busy. I ordered ITA-01 35mA from them and they delivered. I waited about 2 months for them and I am very happy with the product!

Anyway, they were very slow with emails etc ...

Regards
Thanks, but slow is different to get absolutely no reply - since several months! And this is a kind of sad as the pictures on their website are my 300B amplifiers.