Sonic qualities of SET output tubes?


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


If so, I’sure would like to hear from you.


Amplifier design and the technology utilized within its confines decides the ‘voice’ or influence it will yield as much or more so than merely the output tubes the designer has chosen to use.


I get that part emphatically. One must hear the amp regardless the type of output tube technology on hand.


And yes, some Pentodes and Tetrodes are used as Triodes but are not indeed triodes by their specific architecture. That’s OK, just focus on their use as Triodes herein, please.


There are however certain tube types, irrespective of vintage which have basic undeniable sonic colors or characteristics, apart from their electrical aspects which keep attracting people to amps which use this or that tube in its output stage.


Some love 211s. some adore 300Bs. Some love EL34s configured to run as Triodes. I have an affinity for the latter. So far anyway. This topic could change my mind.


Has your own experience informed you what this or that output tube’s natural flavor regularly announces itself to be so you can have a reasonable expectation of its general presentation?


What sonic attribute continually attracts you to a particular SET tube design, 300B or some others?


Or, conversely, what is it about the sound that would bring you to covet a 211 amp over a 2A3, for example.


Why as another example, would you pick a 2A3 amp over one using 805s or 300B, 211, etc. or vice versa?


Removing ‘vintages’ and electronic or electrical qualities from the argument, what sonic attributes for the more popular S.E.T. amp output tubes have you determined seem to persist in their particular DNA?


I’m asking for input from those SET tube devotees to lend their experiences and knowledge on the subject of what tube sounds like what irrespective of the SET application, generally speaking.


My goal is to try getting a better feel for which SET Tube amp design, if any, I’d want to pursue and possibly invest heavily into going forward as the soul of a new system.


Tremendous thanks to all!

blindjim

Showing 3 responses by saki70

Blindjim ;

I took a peak down this rabbit hole as well as the one next door addressed as high efficiency speakers .

One of the responses by Ralph addressed the difference between the requirements of SET amps and PP amps . He stated the same desirability of running a SET at a maximum of 20% power . But then he stated how PP amps really needed some power to sound their best ... like maybe 20% + power .

After peaking down the HE speaker rabbit hole , I found it difficult to find speakers that were affordable , at least halfway aesthetically pleasing and suitable for my situation .

Right now I am content with what my current PP amp is doing and seeking improvements in other directions . I have spent quite a bit of time rolling input , driver and power tubes to get where I am .

While I still may seek out a SET amp in the future , I think that I would have an easier time finding one in the PSET realm where speaker choices would be more plentiful due to the added power of the topology .

Have you given any thought to PSET's ?

On a different note...I believe that you are in the TB area . Where would you go to hear different tube amp demonstrations ?


Good Luck .

Blindjim ;

If you do investigate HE speakers...take a look at those with built in amps for the bass units . I would think that these would be ideal for low power amps .

Just a thought .