Sonic qualities of SET output tubes?

Blindjim,
At the risk of redundancy I must agree with Whart and his sage advice regarding amplifier and speaker matching, a critical point. This is especially true for lower and mid powered tube amplifiers, you have to consider your options simultaneously.

I have three tube amplifiers.
100 watt 6550/KT 88 push pull
40 watts el 34 push pull
8 watt 300b SET

The 8 watt has superior sound quality driving the same speaker as my other two amplifiers. This possible due to the choice of the speakers I use. I suspect that you’d be very pleased with a moderately powered class A tube push pull, Jadis for an example or the VAC Renaissance 30/30 (300b push pull) with an easy load speaker with sufficient sensitivity. SETs aren’t for everyone although they’ve served me extraordinarily well.
Charles

blindjim,

I can relate to just about everything you have said,

I may listen to a little bit different music than you do and have a slightly bigger room,20x25x9 that opens into our kitchen.

I have put a lot of effort in matching the right components to get the best sound for me overall.

I have Tekton double Impact speakers that are 95db with 1 watt,and they have a relatively flat impedance load so they are easy to drive.

I have the linear tube audio MZ2S preamp which can be used as a headphone amp and also can drive speakers with a 1.38 watt output into 4 ohms.

I have tried quite a few different amps with these speakers and I like the Linear tube audio Zotl 40 with both products using all nos glass.

Kenny.

Whart > If you are asking about SET amps, I don't think the question of speakers is a secondary one.

Blindjim > Thank you. you are indeed correct on the synergy factor. I’m in the assimilating information role currently on both ends of this enigma. , er, project.


Speakers are IMO way more sexy and impossible to ignore in a room. I feel too, they are the only items one should see or hear as the electrical gear needs be sequestered into an adjacent room or space as is my present circumstance.

BTW… which Horns?



Grannyring > The sensitivity of the speaker is vitally important

Blindjim > Thanks Grannyring. Very grateful for the affirmation. Got it.

It works the other way ‘round too. In fact, once I quit being stubborn and dive into the tube amp (s) path, speaker types and their attributes will be forced into renegotiation. I suspect then, both amp and speakers will be bought or ordered in simultaneously, each with the other well in mind.


RE driving to concert levels.
This is hardly an issue for me sure I’ll kick things up to an average of in room db levels to 94 or 95db…. For one song, maybe two. That’s all. Perhaps a few songs will get some more watts beyond avg. levels, but I’ve noticed with the loss of vision and some maturity, I’m no longer attracted to loudness for the sake of loudness alone.

it actually hurts.

Usual listening levels are just above being able to casually talk to someone else in the room, requiring the sound be turned down or muted to do so. So somewhere in the mid 80s maybe. Never bothered to test it when I had the chance or did and then forgot...


Which ever match up gets the nod, it will be more than capable of handling these isolated events.

I’m nuts, not insane and I would sort of like to keep the hearing I still possess in tact. In fact, if I’m at a location and the levels are tremendous I’ll probably leave regardless how much I might love the performers. Ordinarily I’m only going to outdoor shows, in the evenings or from Nov to Apr., when possible.

Lengthy streams of screaming wailing instruments and singers have slipped into the ether leaving me fondly and forever behind their wake. They are but intermittent blasts from the pasts these days.

Blindjim,

Can you readily identify a 300B, 2A3, 805, 211, etc., amp’s sound with your eyes closed most of the time?

You asked this main question and I thought I could give you my opinion on this.

I believe to some small degree,along as each individual different output tube has the proper circuit design and the amp has the correct matching between tube and transformer,the 3 most common lwr pwr tubes,300b,45,2a3 have slightly different sound to my ears and that comes from listening and or owning a few but certainly not all designs.

300b,has the most midrange warmth and body with slight extension roll off on sides of the frequency range.

45 tube has more clarity with less midrange warmth and body,but has greater frequency extension.

2a3 tube to my ears splits the difference between the first two.

Similar sonics to all 3, 
They will have a certain purity and inner glow that also some people refer to as "breath of life qualities"that no other topology of amps tubes or SS have,at least I haven't heard any in 35 yrs.

The big pwr transmitter tubes that I've heard or owned generally sound quite similar with not very noticeable difference in sonics.
 But Offcourse the same as the lwr pwr amps there is just to many variables in the overall designs to really speak accurately to the differing sonics.

Atmasphere provided a great list of variables in design that most certainly effect the sound.

Other Variables that can effect the sound in all tube amps,

Power supply
Type of output transformers 
Types of coupling capacitors 
Different brands of tubes
Different types of driver tubes
Different types of rectifier tubes
Hard wired or circuit board
Solid state or tubed rectified 

And probably other things I'm just not aware of.

I only own one set tube amp which is a Yamamoto A09s which is a 300b 8 watt per channel amp.It's a slightly different design than most 300b amps.It uses Torroidal type transformers in the pwr supply and also the output transformers which gives a slightly different sound.

Way to many variables overall to accurately predict the sound and the best way is always listen to one in your own system and room.

Hopefully I helped you,
Kenny.

@blindjim - the horns are Avantgarde Duos which I have since around 2006- so they aren't one of the newer models but benefitted from some of the running updates prior to the Omega modification. Their internal woofer system is augmented with a pair of 15" subs that crossover very low- e.g. 50hz on a step- 24db/octave slope. With some adjustments to volume and phase (and a little DSP box only on the subs), they give some additional heft and dimension to the Avantgardes without distracting from their coherence. Even that speaker, with its 104 db efficiency, can benefit from a more powerful amp, but there is a synergy with the Lamm ML2, which I like very much. It's instructive to listen to them against the Quad ESL--the Quads are so compromised in certain respects, but their vital strength--the midrange--overcomes most of their shortcomings.