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In the Forum: Audio Discussions
In the Thread: NAT Audio Magna -160 Watts of Single-Ended Class A
Post Subject: The KR Audio ways.Posted by Romy the Cat on: 11/17/2007
 morricab wrote:
Hi Romy, KR audio is making high power SET and parallel SET amps using tubes designed by them specifically for low frequency amplification (read as in not radio frequencies).  They are getting the power with lower voltages and higher currents than from transmitting tubes and their output transformers are some of the only ones I have seen measurements for that show essentially no core saturation.  The VA350 model I have is down about 1 db at 25khz and -3 db at 40Khz, so a wide enough bandwidth and bass to 5 Hz...at about 5 watts of power.
I do not know a lot about KR Audio amps. Looking at their tubes:

http://www.kraudio.cz/tubes.html

I do not see any particularly higher current tubes. Still if they are getting 30W out of VA350 model then it is great.  How much voltage that T100 tube has on plate? Is datasheet for their tubes are available?

If they run their output tubes at relatively low voltage and have good output transformer then it might be very interesting amp. As I understand they use SS driver stage that is very much is the way to go. I in a past was thinking myself about this type of configuration but I do not undusted how SS works and frankly I panicly afraid SS (because my disability to do anything with it). Anyhow, if you have any sharable data about this amp, particularly about the output tube, then please post it.

Rgs, the Cat

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