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Old 18th July 2012, 09:10 PM   #1
Nikitas is offline Nikitas  Greece
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Default amplifier discussion

After reading some articles, I got this idea: an amplifier with the following characteristics

Constant current source output
NO feedback
Class A
Single ended
widest possible bandwidth
10-20Watts output
balanced(?)
monoblock
using 300B.

Is there anything out there like that?

If not maybe we could start from somewhere and evolve it.

Or why not, start it here from ground zero. We could give it a name like "diyAmplifier".


Any ideas?
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Old 18th July 2012, 09:58 PM   #2
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Is this something you want to build? If so what is it supposed to do? What source and speakers do you have? Are you able to build tube equipment?

If you are using 300b you'll get 10 watts in SE and maybe 20 in PP so first decide what you are trying to do here. Balanced sounds like PP. If that's the case monobloks would be a good idea since there will be quite a few tubes in it! This is expensive, though. How much power do you actually need?

Andy
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Old 18th July 2012, 09:59 PM   #3
DF96 is offline DF96  England
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300B is a triode, so you have inherent feedback via the anode electric field. By "CCS output" do you mean "CCS output stage bias"? If so, you then have to find suitable cathode decoupling caps but some people are frightened of caps. How can it be single ended and balanced?
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Old 18th July 2012, 10:01 PM   #4
mvd is offline mvd  Germany
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Quote:
Originally Posted by Odysseas View Post
After reading some articles, I got this idea: an amplifier with the following characteristics

Constant current source output
NO feedback
Class A
Single ended
widest possible bandwidth
10-20Watts output
balanced(?)
monoblock
using 300B.

Is there anything out there like that?

If not maybe we could start from somewhere and evolve it.

Or why not, start it here from ground zero. We could give it a name like "diyAmplifier".


Any ideas?
Hello

Not Single Ended but balanced and most of your points accomplished:

http://www.nutshellhifi.com/IT-Triode-Amp.gif

Maybe a good choice for your amp

best regards
Michael
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Old 18th July 2012, 10:06 PM   #5
Nikitas is offline Nikitas  Greece
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single ended and balanced that was actually a question.

I'm interested in the discussion mostly, not the actual build. I will make one but not in the near future. maybe I will start around Christmas.

Basically I find the above ideas very interesting to mix, and want to see how many of these I can squeeze in.

I like the idea of single ended cause it is more "natural" than push pull.

current source output, I'd like to try it with full range speakers, after reading one of the articles Nelson Pass wrote, and I found intriguing.

Last edited by Nikitas; 18th July 2012 at 10:07 PM. Reason: word salad
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Old 18th July 2012, 10:14 PM   #6
mvd is offline mvd  Germany
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Quote:
Originally Posted by Odysseas View Post

I like the idea of single ended cause it is more "natural" than push pull.
With a Push-Pull amplifier you get less distortion over a single ended device. Therefore a single ended amp can't be more natural.

Best regards
Michael
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Old 18th July 2012, 10:27 PM   #7
Nikitas is offline Nikitas  Greece
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natural meaning swing above zero
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Old 18th July 2012, 10:29 PM   #8
DF96 is offline DF96  England
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Quote:
I'm interested in the discussion mostly,
Is there not already enough discussion on here?

Quote:
current source output
If you really mean this, then you will need feedback to get a high output impedance. And speakers designed to match.

Quote:
I like the idea of single ended cause it is more "natural" than push pull.
See this, especially figs 3 and 4. All SE fans should read and try to understand this article.
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Old 18th July 2012, 10:44 PM   #9
7N7 is offline 7N7  United Kingdom
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Quote:
Originally Posted by Odysseas View Post
single ended and balanced that was actually a question.

I'm interested in the discussion mostly, not the actual build. I will make one but not in the near future. maybe I will start around Christmas.

Basically I find the above ideas very interesting to mix, and want to see how many of these I can squeeze in.

I like the idea of single ended cause it is more "natural" than push pull.

current source output, I'd like to try it with full range speakers, after reading one of the articles Nelson Pass wrote, and I found intriguing.

Many years ago I took a look at the graphical representation of a sine-wave; from that time hence I have always been convinced that push-pull is, as you put it, "natural" and indeed, obvious. Apart from the replication of the sine-wave, p-p has other advantages, some of which have already been mentioned in this thread.

Of course It really should be only Class A, but push-pull it must be, and the more push-pull the better - so balanced in, balanced out for me.

7N7
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Old 19th July 2012, 07:45 AM   #10
Nikitas is offline Nikitas  Greece
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DF96, if you don't feel like, if you find it boring or irritating, or believe that it has been already too much discussed, you could simply not read/respond.

I didn't start thris thread to debate on which is best, which sounds better cleaner etc.......

Last edited by Nikitas; 19th July 2012 at 07:49 AM.
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