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Best 300B SE OPT?
Best 300B SE OPT?
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Old 11th June 2011, 10:23 PM   #11
andyjevans is offline andyjevans  United Kingdom
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I'm reviving this thread to see what new information we can squeeze out about the best OPTs for our beloved 300b SETs.

Interested particularly in actual comparative listening data, rather than word of mouth recommendations.

I just compared these:
a) O-netics OPT. This was flat out my favourite - in another class for tone and detail
b) Lundahl LL1620/60mA. Lacks the refinement of the O-netics on strings and voices, but it does have quite good tone to instruments. A loss of micro-detail compared to the O-netics. Bass was strong but less defined in tone
c) Audio Note Trans-300/IE. About the same level as the Lundahl above - smoother and more rounded but a further slight loss of micro detail. Bass again strong but less defined in tone than the O-netics

I further have been using the Lundahl LL1623/50mA in another amp. I haven't compared this directly but my other listening gives me the impression it's better than the LL1620. I've loaned it out so can't compare right now.

Can others share their listening experiences?

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Old 11th June 2011, 10:31 PM   #12
REDHORSEMAN is offline REDHORSEMAN  United States
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Originally Posted by bbaker6212 View Post
a good PP amp like what? I currently have a KTA 3030 PP 300B.
Like a Marantz model 8
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Old 11th June 2011, 10:38 PM   #13
andyjevans is offline andyjevans  United Kingdom
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I think we're talking SETs here!

Correction to the Audio Note - I think it's a Trans-152. That's a cheaper version (about half the price). It has no markings but the size fits. It has endbells.



Last edited by andyjevans; 11th June 2011 at 10:50 PM.
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Old 11th June 2011, 11:27 PM   #14
Vinylsavor is offline Vinylsavor  Germany
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All parts in an amp need to be balanced in order to get a good result. Especially if you are looking for the best sound/cost ratio. If a poor driver and mediocre power supply are chosen the amp will not sound good even with a sophisticated output transformer.

My picks:

For no compromise amps with the best possible driver, PSU and filament supply:

Tango FC30-3.5-S
I have not tried the Tango X3.5S yet, that one is probably even better
I also have a permalloy core 3.5k Tangot OPT which I have not tested yet.

Ambitious amp, but somewhat restricted budget:

Tango XE20S

If on a budget:

Lundahl LL1664

Oh, and the tube makes a big difference too. For me chinese or russian 300Bs do not cut it.

Best regards

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Old 11th June 2011, 11:44 PM   #15
carbondated is offline carbondated  United Kingdom
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Any word on Hashimotos?
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Old 12th June 2011, 07:04 AM   #16
Jaap is offline Jaap  Netherlands
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Nobody likes toroids ?
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Old 12th June 2011, 08:42 AM   #17
Rod Coleman is offline Rod Coleman  United Kingdom
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Best 300B SE OPT?
Andy, don't forget that ETF 2009 shootout was a 300B OT contest, featuring some of the trafo choices mentioned here.

European Triode Festival - ETF2009 Shootout

Lots of comparative listening there!

Personally, I use, and recommend, the Sowter SA08s.

They may not get much of a mention elsewhere, but what I can say for certain is that they allow me to develop 300B driver and filament circuits by listening. In listening tests, the SA08 allows very easy selection among tiny circuit changes in any other part of the amplifier. And I am able to enjoy big symphonies in the same way as I do live concerts, and often the pleasure is greater, because the orchestral parts are better and more clearly presented.


All good quality OTs are high cost purchase, but spend happily - they last a lifetime.
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Old 12th June 2011, 12:15 PM   #18
andyjevans is offline andyjevans  United Kingdom
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Thanks for the ETF shootout info. Clearly the AN Trans-300 is better than the Trans-152 which is pretty average really and didn't do too well in the Silk shootout. Lundahls don't seem to be at the top of the tree - there's a lot of windings in most of them. I was disappointed with the LL1620.

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Old 12th June 2011, 12:25 PM   #19
kmaier is offline kmaier  United States
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Originally Posted by carbondated View Post
Any word on Hashimotos?
Yes, I use them. They have become my first choice actually. I am designing a 300B SE amp using their H-30-5S OPT.


Regards, KM
... just because you're paranoid, it doesn't mean they're not after you...
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Old 12th June 2011, 01:19 PM   #20
greenvalve is offline greenvalve  United States
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The transformers I had Bud wind are for GM70 tubes. With an impedance of 6K they could be swapped into my DRD 300B amp easily. If you would like I will give that a try, as I have been wondering how they would sound. Not that the standard copper Electraprint iron is any slouch.

I also have some solid silver secondary Electra-print iron for 2A3 finals. They are nice. And Gery at Transcendar makes some great iron. Back when he was still taking custom orders he wound 6pr of custom 10Y/801A transformers that I still listen to daily. Great synergy with those little 10+ Transcendars.

The most detail can be heard from the silver secondary Electraprint iron, the best tone from the Onetics, but we are talking many different amps, so its not apple to apple because of my limited experience.

Last edited by greenvalve; 12th June 2011 at 01:34 PM.
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