tubes or not..!

[GeirW]

ciao..

i guess you found the title to be intriguing..
but the following question is maybe not..

maybe some fing it redundant..
but neverthelesss a valid one.

the question is very simple:
(i assume it`s duable.)
to increase the number of tubes used in a PP
from two to four or six.

am not thinking of what you can get
from them in wattage.. (would likely demand a lot of power.)

but in many cases.. using more small components/values..
instead of a big one.. will deffinetly increase the
information handling.. (am talking non-audio.)

"translated to audio"
if you using ex: 4x tubes.. instead of 2x.. wouldnt the output be more accurate. ?

(do it exist any example of this..?)

 

[Tube_Dude]

When more...is less...

if you using ex: 4x tubes.. instead of 2x.. wouldnt the output be more accurate. ?

I presume you talk about puting more tubes in parallel.
In my opinion ...no!...Tubes in parallel are good only if you need the (more) power...but the sound quality suffer as a increased smear of fine details and timing...

 

[GeirW]

ciao.

hmm. as i think about it.. what i was saying
is more like a X-over.. wheres you got a couple tube`s
(circuit) for each frequency band..
let`s say divided into four.
where each separate couple.. is amplifying/controls
a given FQ-curve..

kinda like the hybrids that uses mosFET/tube
divide the full FQ. band into two.

 

[Sch3mat1c]

"Information handling" is a question of the circuit and has NOTHING AT ALL to do with the tubes, aside from inherent bandwith (starts to matter only well above 10MHz), distortion and gain limits. (Distortion can be cancelled with extra gain and negative feedback, and BW can be corrected to some extent.)

Generally, increasing the number of tubes assumes a circuit change to accomadate this; for instance, bias, power supply and load resistance changes to maintain the output tubes at an operating point and load which produces the least distortion for the most power. Now, if that is done, then power output will be doubled if you double the number of tubes. Which means that the same listening level of say .5W will be 5% instead of 10% of full power output of a 5W amp, and accordingly distortion will be lower.

If you want to divide the audio band into smaller sections and amplify each segment alone, efficiency can go up (if you design for it) but if you don't accomadate phase differences around the fringes of each band, you'll get nasty null points and stuff.

Tim

 

[GeirW]

ciao.

well. you nailed it.

If you want to divide the audio band into smaller sections and amplify each segment alone, efficiency can go up (if you design for it) but if you don't accomadate phase differences around the fringes of each band, you'll get nasty null points and stuff.

accomadations to ocouring diffrences are quite logic
if one are gonna build a such design.

nevertheless.. such a design.. seems for me.. to be a
big stepp audiophile perfection..
i haveen`t seen a design like this.. maybe coz. it`s to
expensive and complicated ?
don`t realy know.. would it be a major catch to it.??

btw. "Information handling" was a not the word i was
originally looking for. i think you got my drift
anyway..