Yep, from the XS Pre though. Unfortunately you can't see the transformer in the amps.
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I had an interesting conversation with Chris the sales manager for Torriod Corporation. A large portion of their business comes from custom transformers. Chris said they are open to supplying small quantities but it only becomes profitable for them (and more affordable for us) if the quantities are in the 5 - 10 range. Their company has an engineer on staff who is knowledgeable in audio...his name is Ming and he sent me an email offering his services. I don't know what specs make for a good transformer for audio...that's where I need your help. I'm thinking of doing a small group buy and see how it goes. They could ship directly from their facility. I have many questions, one of course is at what cost.
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It's good to hear about an alternate supply for quality custom transformers. One of the recommendations that I see frequently for audio power transformers is to wind them on a larger core than standard. This helps keep the magnetic field contained within the toroid, especially when the transformer is being used for Class A duty. Of course we also like to see an electrostatic shield between primary and secondary windings plus an outer magnetic shield band. These last two qualities are what make the Antek AS series transformers work well for our application.
As a footnote, I bought a few of the Plitron transformers several years ago to use in 100W Class A/B amp rebuilds. They are nice, but still overpriced for what they are. I will eventually be reusing a couple of those 625VA, 50V transformers in a custom 50W class A build.
As a footnote, I bought a few of the Plitron transformers several years ago to use in 100W Class A/B amp rebuilds. They are nice, but still overpriced for what they are. I will eventually be reusing a couple of those 625VA, 50V transformers in a custom 50W class A build.
You should check out the power transformers on the Toroidy website especially the audio grade ones.
I'd love to hear a comparison to the sound of the anteks... looks like the price is quite a bit more for the Toroidys.
Me Too...I just need to get my amp back together. Problem is I'm installing an SLB PS at the same time, so it's not a controlled test and an unfair comparison.
Yes, and you need to factor in shipping from Poland as well.
They have a note down near the bottom of the page:
"Didn't find a suitable transformer ? Please write or call us.
Transformers with different parameters are available on individual request."
From my experience they answer quite fast. I'm about to order a set of tube output transformers.
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Toroidy built some 120V transformers last year (audio grade) for me. Very high quality and customer service is top notch.
I have used 3 transformers from them and all are US primaries. Just make sure you’re VERY specific on what you want
If you insist on a torroid then you want an electrostatic shield from primary to secondary to reduce the capacitive coupling and lower the bandwidth of the AC line noise it lets through and an external shield to reduce the radiated field. You can only get those 2 options if you get custom made toroid transformers, not off the shelf series. And you still have to deal with the torroid inrush current, either with a soft start circuit or at least a properly chosen thermistor
Or you could buy an R core and skip all that crap, but no one here seems to be listening. Seems odd for an audio oriented web site.
Torroids were popular in the 1980s, but we’ve learnt things since then. Look at Audio Research, the new Parrasound JC 1+ and JC 2 preamp, Constellation Audio Etc. There's a reason their all using R cores in thier best products.
Or you could buy an R core and skip all that crap, but no one here seems to be listening. Seems odd for an audio oriented web site.
Torroids were popular in the 1980s, but we’ve learnt things since then. Look at Audio Research, the new Parrasound JC 1+ and JC 2 preamp, Constellation Audio Etc. There's a reason their all using R cores in thier best products.
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I've spoken with toroidy and was able to customize even the wire lead lengths in addition to primary voltages etc..
Guess what the Mark Levinson Ultra low noise Torroids in the the 32 and 326 preamps used? No beer for guessing ESL shielding.
Yes R cores have lower inrush- no thermistor or soft start required in the dac or preamp - Fuse is 2 amps for the 4 x 100 va in the preamp chassis - load is about 100 watts class A in the preamp / phono -yes 100 watts class A for a balanced jfet/fet preamp and phono. There are almost 100 TO247 fet and bipolar devices running at 45 C, most are in the power suply - Jung super regulators, then the fet shunt regulators, the output of each analog stage is Hitachi fets running at 80 ma and 24 VDC - 2 watts per device - very deep class A
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I'm interested and still haven't bought anything. Is there a reason why R cores are more likely to be used in preamps than in amps?
Unfortunately, I'm still pretty close to the adult-lego-stage of design. Can I just replace the torroid with an R-core and otherwise leave the power supply design untouched?
Thanks.