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In Reply to: Re: Joule... posted by Rich Brkich on October 18, 2004 at 15:29:05:
There was another interesting exchange of posts between Ralph Karsten and David Berning about David's innovative circuit design this past July on Audiogon: interesting perspectives from David; compliments from Ralph; interesting reading all around:
Follow Ups:
Hi. I heard my name mentioned, and decided to come in for a chat.I own a custom ZOTL that Dave made for me last year.
It is a SET-ZOTL which uses Type 45 output tubes driven by 6SN7 tubes, choke loading, 12v battery power only. The chokes were hand-wound by Dave, and the entire unit is hand-wired point-to-point and is considered a "prototype unit". I use Sylvania 6SN7GT tubes and Emmission Labs 45 mesh plate tubes.The output is rated at 2 watts into 8 ohms.I find the discussion about the ZOTL being an "OTL" or not, to be something that has come up numerous times since Dave invented the ZOTL. I feel he intended to make some distinction between the two, because he used the name ZOTL instead of OTL. Whether any particular individual wishes to apply the moniker "OTL" to it, or not, is rather immaterial. Rather, this circuit truly is a unique design, which actually exceeds the capabilities of both output transformers and traditional OTL, so I would classify it as a "new generation" of circuit.The ZOTL provides the impedance matching as good or better than output transformers, without the drawbacks, and provides the sonic attributes as good or better than traditional OTL, without the drawbacks. This combination of superior impedance matching and lack of output transformer, provides some things that have never been available before. For example, my SET ZOTL has only one output tube per channel, and no output transformers. This is impossible to do with traditional OTL circuits, due to the inability to match the high impedance of the tube to the low output impedance needed to drive the speakers(unless a gang of output tubes is employed).
Regarding the presence of certain transformers in the output stage, they are not output transformers, and only perform impedance matching functions at the 250kHz level(out of the audio range), and pass the signal within the audio range. This is a unique method used in audio, and derives its origins from industrial power-transfer technology. It is obvious to see that these transformers could never be output transformers, from a cursory inspection.
I'm familiar with your custom SET ZOTL from your discussions at Audiogon. I take it you are still pleased as punch. I'd still like to come by and listen to what you've got going sometime. Did you end up staying in Tennessee? I'd also like to see Tennessee.
Oh, and yes, I am pleased as punch with my Berning SET-ZOTL 45.
and I like it.I sold my Atma-Sphere 208 table and am going to miss it. I have aspirations to become a dealer in the near future and need a TT that is more readily available for customers.
I am considering one of the Teres trio. Any input you can give me on the subject would be appreciated.
I think that the 245 is the lowest Teres TT that would give you what you want.
The 245 has the plain acrylic platter, but has the weighted cocobolo base, and is the one that I own.
You can get better by going up to the 255, 265, or 300 series, but the money starts to get pretty high on those.
I like my 245 for the money, but I do acknowledge that the others are better if you can afford them.
I think the battery power option(DC Signature version) is worthwhile, and gives a bit more for not alot more money.
Audiopoints under any of them is an improvement, and I have tried all the Teres feet, as well as others. I use 3 of the 1.5AP-1D Audiopoints under mine. Jphii also uses them and likes them under his Teres. The new tape drive system is great, and I think they all come with that now.
It's gonna cost you over 3 grand, but it competes very well with others that cost alot more, so it is a relative bargain, as these things go.
I'd love to have a Teres 360, but it is way out of my price range.
I go for the "bang for the buck" items.
Wellfed, yes I'm still in east Tennessee.I am still trying to get the house finished, so my fiancee can move in. I expect that by the end of the year it will be habitable. Maybe not great, but habitable.
Do you know if Midwest Audio Fest will take place in Indiana this coming spring?
I don't know about the Midwest Audio Fest schedule.
I'll be at the CES in Vegas during January at the Starsound Technologies booth.
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