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168.200.2.1
Has anyone heard these amps. Since they dont have a transforme I guess thy ar OTL's but they appear to be a different implemantation. Just curios about the opinions here if any
Follow Ups:
I've received letters from Butler and Moscode, oddly enough. (I get around [!]). Moscode, made by a George Kaye (believer in Futterman amps of old), will be shown at the upcoming N.Y. audio show. The one model, called the 401 (?), will sell for $5,000. He strongly believes in hybrid applications, reminding me of Van Alstine (in design theory, anyway, especially the use of MOSFETs). Butler is very expensive as I recall from their letter (over $10,000) and they are secretive about the parts they use. Depending on which one has the suitable daughter for marriage, I've (secretly, now) planned on a M.A.C. [Marriage of Audio Convenience), buy either amp at less-than-wholesome-wholesale, and depart the following week - not the following day, that would look too suspicious - never to be seen again.Respect,
Guy
There are 12V car audio models as well and I have two. The 6L6 is the driver stage before the finals. The finals are MOSFET's in a configuration called MOS_Valve( there is a patent). There is a control that dictates the gain of the driver stage vs the gain of the final stage. In one extreme of the pots position it is "tube" and the 6L6's are driven close to their peak. This way the final gain stage is very small- 2-8 X depending on the model. The manual says the amp will sound sweeter this way but not quite have the maximum output it is capable of doing. Fully in the other position the 6L6 is driven much less and the SS final's gain is higher. Not as sweet sounding and a little higher output. "Tube" setting is much nicer. I have the 250W X 2 and the 90W X 4 versions of these amps. They have XLR and RCA inputs. I also have two of their line drivers that use 12AX7's and convert RCA's to true balanced. I have a car where I plan building my dream 12V system. I plan on using a Laptop PC as the head unit w/digital out to a MF Trivista DAC to the line drivers to the Amps. I will also be using an inverter to a PS Audio power plant to give clean AC to the DAC and a remote control NAD tuner and PC. I have two nice deep cycle batteries and a battery isolater/regulator (keeps a constant 14.4 V) and 30- 100,000 Mfd caps for stiffening the DC supply. Lots of smaller caps is better than say two big 1 farad caps. I worked in that industry about 10 years for a real high end company. I also have some Kef and Oz Audio sets of speakers and lots of good woofers too- all in the attic waiting quietly to someday sound nice in a car. ('65 Chrysler 300) That car will not balk at the 400 pounds of dynamat needed to sure up the acoustics. Clear tint on the inside of all windows adds a nice touch too as the glass in a car........well you know what it does. Oh the amps? Yes they are the best sounding 12V stuff I ever heard by far. That's not saying a lot but yes the are really nice. I have seen the 150 X 2 version on Ebay go for less than $400 recently.ET
Hi,The Butler Patent is readily availble. If you look closely you find that the Valves are used as Bias devices in diode mode.
Basically, it is virtually completely a Solid state amp.
No idea what it will sound like, why not seek out one of their dealers and listen?
Ciao T
Both Counterpoint and NYAL (the "Moscode") at one time or another marketed amps of this type. Those two were very good sounding, IMO. But I agree, not strictly "OTL"s.
I read some of the tech data on the website. This seems to be a tube/ss hybrid (albeit a unique one). These are not typically considered an OTL, since an SS output stage rarely has a transformer anyway. I'd be interested to hear one, however.
Here a quote from their website
http://www.tubedriver.com/main.html"Tube Driver BLUE produces the best Vacuum Tube audio with a completely open-ended design (ZERO global degenerative negative feedback). It also eliminates one of the most problematic components that plagues virtually all other vacuum tube amplifier designs: the Output Transformer.
Coupled with novel output load mirroring circuitry, hand-selected dual triode tubes operate in a safe, near plate-saturated mode continuously. Therefore, Tube Drive BLUE creates the ideal electrical environment for classic vacuum tube characteristics."Not really sure but I suspect it's a hybrid with the three legged guys on the output.
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