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-   -   Dennis Had Inspire Amps (https://www.audioaficionado.org/showthread.php?t=24170)

pstrisik 11-28-2013 02:09 PM

Dennis Had Inspire Amps
 
Is it permissible to discuss these amps in this section? Dennis is the man behind most, if not all, of the Cary tube products.

He is building single ended 12watt stereo power amps at reasonable prices. I'm seriously considering one:

He just released this one with KT150 tubes!

http://img20.imageshack.us/img20/4294/1d93.jpg

Masterlu 11-28-2013 02:15 PM

Sure! :thumbsup:

But we don't post links to eBay, sorry. :o

pstrisik 11-28-2013 03:42 PM

Quote:

Originally Posted by Masterlu (Post 555363)
Sure! :thumbsup:

But we don't post links to eBay, sorry. :o

Ok, sorry. And thanks for removing it for me. I'll only mention though, that eBay is currently the only way to order them (new) and directly from Dennis. Easy to find there if anyone is so inclined.

I'm particularly intriqued by his use of the KT150, the brand new TungSol "buck rogers" tube. In corresponding with him, he detailed some differences between the KT120 and the KT150/KT88 which he favors. Mostly about hard vs. soft clipping and more that was above my head!

In conrad-johnson forum discussions, there was wondering and speculation about whether the KT150 could be a drop in replacement for the KT120/6550 that CJ most often uses these days. I asked Dennis about the tube swaps possible with his amps and the following are possible with varying resulting output power, no need for biasing at all, only sometimes the need to change the rectifier tube to go with the chosen power tube:
  • 5 watts per channel - 6V6 output tubes and 5Y3 rectifier tube
  • 7 watts per channel - 6L6, KT66, 5881 output and 5U4 rectifier
  • 10 watts output - KT88, EL34, 6550, KT99, and KT120 output and 5U4/274B rectifier
  • 12 watts output - KT-88, KT-120, KT-150 and 5AR4 rectifier

Jwhcfi 12-06-2013 08:40 PM

Peter,
Love the amp. I've always wanted to try a SET tube amp but I own Vandersteens and they are only 85 db efficient. I emailed Dennis and he thinks the KT150s will drive the Treos but I'm struggling to see how 12 watts can do it. I'm still tempted and may go for it just to prove it one way or the other. Keep us posted on your progress.

Mikado463 12-06-2013 10:19 PM

Cool bit of kit, thanks for sharing Peter

pstrisik 12-07-2013 01:50 AM

Quote:

Originally Posted by Jwhcfi (Post 557921)
Peter,
Love the amp. I've always wanted to try a SET tube amp but I own Vandersteens and they are only 85 db efficient. I emailed Dennis and he thinks the KT150s will drive the Treos but I'm struggling to see how 12 watts can do it. I'm still tempted and may go for it just to prove it one way or the other. Keep us posted on your progress.

I will. I ordered one - in Jaguar Carnival Red :yes:. He's making them to order at this point. So, it will be a couple of weeks, at least, until shipping. There's nothing but skepticism all around. I'm getting doubts in the AR forum at ClassicSpeakersPages.net as well. My AR 2ax speakers are about 87db, though 8 ohms which helps. Even if there's not enough for higher volumes, if I can get sound that wows me at lower volumes, I will either go the way of finding or building 93db+ speakers or finding some Cary CAD508AE monoblocs for that single ended design of Dennis' with clearly enough power.

Fun exploration in any case!

mulveling 12-07-2013 03:41 AM

Quote:

Originally Posted by pstrisik (Post 558007)
I will. I ordered one - in Jaguar Carnival Red :yes:. He's making them to order at this point. So, it will be a couple of weeks, at least, until shipping. There's nothing but skepticism all around. I'm getting doubts in the AR forum at ClassicSpeakersPages.net as well. My AR 2ax speakers are about 87db, though 8 ohms which helps. Even if there's not enough for higher volumes, if I can get sound that wows me at lower volumes, I will either go the way of finding or building 93db+ speakers or finding some Cary CAD508AE monoblocs for that single ended design of Dennis' with clearly enough power.

Fun exploration in any case!

As always, it depends on your room setup and listening habits. I found my lower power limit to be 25 Watts/ch into 93dB/Watt 8 ohm speakers, but then I like to listen quite loud and my room is not terribly small. Those 25 Watt tube amps sounded incredibly sweet, too.

I think classical music at anything beyond low levels probably won't work great with 87dB/Watt and 12 Watts -- but other music (with a greatly reduced crest factor, like most pop/rock) might be just fine at moderate levels or even a bit beyond. Anyways, that amp with single ended KT150 and a 6H30pi driver looks like fun! I love my gear stocked with KT120 and 6H30pi, and I bet the KT150 is indeed better.

fjn04 12-16-2013 05:45 PM

I'm sorry, but I can't see them driving Vandersteens. I like the Vandersteens, and the amp looks very interesting. I just can't see them dancing together.

sanji 12-16-2013 06:47 PM

Can someone post Dennis's email address please? I have a few questions for him. Thanks!

pstrisik 12-16-2013 07:35 PM

I would like Dennis' email also. I've been corresponding with him through the ebay system which is cumbersome.


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