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In the Forum: Audio Discussions
In the Thread: My (Amplification + Acoustic System): what is next?
Post Subject: The vintage tubes paranoia and a custom bass transformerPosted by Romy the Cat on: 1/11/2008

 Paul S wrote:
I have been surprised that you have not already pursued the Zarathustra for your multi-driver, sealed LF.  From your early descriptions of both, this seemed like a natural pairing and the most likely way to go, to keep the drivers "off the cushion" and also just to handle all that mass.

Zarathustra is a lot of work. I would love to have it built but it will require a lot of labor to do it properly. Anyhow, I would go for all parallel 1.3R bass driver connection before I go for Zarathustra.

 Paul S wrote:
If a DHT for MF only, what sounds better than a 45?  I realize it does not meet all your listed criteria but the tube is special in terms of sonics and "immediacy", and as near as I can tell its usual problems result from improper application, eg, "FR".

I did not say that DHT should be “better” people claims the DHT has different sound but I do not believe in stupid audiophile myths. People for years made many-many different DH SETs and then the indirect heated ML-2.0  literally fucked up all  SETs out there. So, where the DTH myths stays?... I kind of know what people like in DHT and not necessary agree with them, though there is an aspect in all of that that I would like to look deeper. I said that might TRY an interesting triode from 30 or 40 but only if I found something that will be able to do one stage gain. My primary interest is not in direct heating but in the sonic advanced of some tubes from 30-40, unfortunately in 30 all tubes were DH.  Not of the 45, 2A3, AD1, 71A, VT52, UV201, 50, ER-226, 525B, UV-227, 56, PX-25, PX4 or anything else like this will do what I need as they have low Mu or high impedance to be used in a single stage. I am not wiling to use two stages for 2W of MF. If I found a high-gain low, impedance DHT then I might give it a chance it to compete with what I get from 6E5P.  If not, then my single 6E6P will do juts fine and I have no motivations or needs to experiment further. Still, I do not think that DHT tubes ever were made with high transconductance… I need to consult with DHT folks.

 Wojtek wrote:
I think P.Q and Audio Note wouldn't mind building  a monster custom amorphous bass OPT. Looks like they have the best amorphous transformers on the market now. They're damn expensive .

Peter is not a designer and he would have no idea how to build the transformers that I need. It should have two separate coils with separated primary and secondary, having secondary removable and interchangeable 9I can go away with it for LF only transformer). Since each coil will spread juts across a part of the core then it requires REALLY know what the person does in order to hit the target impedance, particularly considering that the secondary will be a load of ~0.9R. Also, I do not know if amorphous bass is something that I need. Bud told a lot about M3 that looks like more interesting for bass…

The Cat

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