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   Home » Audio Discussions » Two-stages, hybrid, small, powerful class “A”? (24 posts, 2 pages)
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05-20-2006 Post does not mapped to Knowledge Tree
guy sergeant
United Kingdom
Posts 260
Joined on 08-03-2004

Post #: 21
Post ID: 2424
Reply to: 2423
Re: Transistor operarting temperature
Romy,

Did you ever listen to a Class A amp made by Andy Rapapport which later became the Octave Research OR1?

I never opened one up to look but I remember someone telling me (possibly salesman BS, I can't remember) about how much attention was paid in that amplifier to maintaining an incredibly stable operating temperature. I remember using one for a while and it definitely took several days to settle down but once it had, it was better than any other SS amp I've listened to before or since.
05-21-2006 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,623
Joined on 05-28-2004

Post #: 22
Post ID: 2425
Reply to: 2424
Zarathustra’s operarting temperature

Nope I’m not familiar with Octave Research OR1. I heard about Andy Rapapport but I never heard or have seen his amps. My thinking about all of this has littler rational and even less experience. I would never think about SS but the phenomenal success with Placette buffer make me to extend some credit to SS. The Zarathustra’s prototype was interesting. I run it on Kharma 3,2 and Wilson Alexandria and it demonstrated some great potential.  From my perspectives it had some issues but none of them related to what usually attributed to SS amplifiers. In the new complete Zarathustra version will be done a LOT to take care about temperature it it will be very different amp, much more advanced. We in fact will be able to drive the output stage in the chosen my us temperature. We juts do not know which temperature to target and how it will affect sound. I feel it will be a lot of listing, testing and interpretations before Zarathustra will be complete…

Rgs,
Romy


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
02-19-2010 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,623
Joined on 05-28-2004

Post #: 23
Post ID: 12983
Reply to: 2362
The Greek Hybrid amplifiers.
fiogf49gjkf0d

I do not know this company but they might do interesting hybrids…

http://www.ypsilonelectronics.com

http://www.ypsilonelectronics.com/technology.htm

The caT


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
03-25-2011 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,623
Joined on 05-28-2004

Post #: 24
Post ID: 15844
Reply to: 2362
The Robert Koda’s Takumi K-70 hybrid
fiogf49gjkf0d
Here is another interesting hybrid. The gain stage is made around 5842 tube, most likely with feedback and the current stage is SS reportedly single-ended and in class A.  They claim 150W, if it is in Class A and without PP then frankly I do not see a lot of surface to dissipate the heat.

http://www.robert-koda.com/product.html

However, God knows what they did in there. It reported that it has 32 transistors by channel, sure they did try to built a lot of current, how long it will stay in class A is not know. Did anybody hear the thing?

The Cat


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
Page 2 of 2 (24 items) Select Pages:  « 1 2
   Target    Threads for related reading   Most recent post in related threads   Forum  Replies   Views   Started 
  »  New  Moscode, Morecode, Moronocode…. ..  Moscode, Morecode, Moronocode…. ...  Audio Discussions  Forum     0  12487  05-14-2006
  »  New  My feelings about new exciting audio products..  Vacuumstate...  Audio Discussions  Forum     25  197901  04-30-2007
  »  New  Lamm hybrids: M1.2 vs. Lamm M1.1..  Lamm hybrids: M1.2 vs. Lamm M1.1...  Audio Discussions  Forum     0  22809  12-12-2007
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