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Tube vs. Solid State-Basic Question

So here I am with my first all tube amp, the Manley Stingray II. While I wait for my Merlin TSM-XMr's to be delivered I've got the Stingray connected to a pair of Definitive Technology BP7004 towers in my theater room. I also ran them with a few other amps....testing them with a Cambridge 550A amp with 60 watts. I was able to play the speakers with the Cambridge well enough, but on tough passages at higher than medium volume the sound got congested and even distorted above that level.

So now I connect the new Stingray, switch to Triode-Mode (just 18 watts) and I get equal volume (or more) with beautiful sound, dynamics and imaging....and that's 18 watts in triode mode! The extra watts of the Cambridge did not appear to be of any use. What's up with that?

So....can some folks more educated on tubes explain to me....like I'm a two year old how the low powered Stingray plays so well with so little power?

Next up was to switch out of the triode mode and get the full 35-40 watts from the Manley which could drive the speakers very loud in my fairly large theater room. While I'm VERY happy with the Manley Stingray, I'm also a bit confused at the power the thing seems to have in spite of it's lower power. In fact my fat Denon receiver (110 watts) cannot keep up with the Stingray.

All comments welcome!

Bob
robbob
gchemie
9 posts
 
Since the Def Tech's have a self-powered woofer, they don't require much in the way of wattage to sound their best, as you are only driving the the tweeter and midrange. No doubt you prefer the seetwer midrange sound of the Manley tube amp and it has sufficient power for the Def Tech's with their self-powered woofage.

Greg
vicdamone
850 posts
 
Kingmacaw, interesting antic dote. I too experienced low wattage tube power using Marantz 8B's and DIY JBL 4530 15" Scoops in the early 60's. The system was a monster to transport and setup but it was way louder than anything commercially available. Then came the SS acoustic 360/361 which was difficult to use in small venues which lead to the SVT. The Ampeg was a slug with a great amplifier section and a pedestrian preamplifier and cabinet. I find there popularity today truly comical. The 200 watt acoustic was way louder with amazingly flexible tonal palette. I found the big difference was horns Vs. flat baffled cabinets.

The 360/361 has been creatively upgraded (not a reissue) by the original designer, Russ Allee. If you ever have a chance to play trough one don't pass it up.
magfan
1,583 posts
 
Current source VS Voltage source?
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