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Old 2nd March 2013, 04:45 PM   #1
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Default 45 Type Push/Pull Amps

45 Type Push/Pull
How many here use or have heard one of these type amps? What are the important factors here in this being able to produce quality sound of this tube with out the noise???
Can this amp achieve the sound quality of an SET amp?
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Old 2nd March 2013, 05:06 PM   #2
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Quote:
Originally Posted by jcmusic View Post
45 Type Push/Pull
How many here use or have heard one of these type amps?
So far I have used the 45 only in Single Ended but will build a PP amp with them some time.

Quote:
Originally Posted by jcmusic View Post
What are the important factors here in this being able to produce quality sound of this tube with out the noise???
The same applies as for any other type amp. Why would it be different with the 45? What do you mean with out the noise? A 45 amp can be designed as quiet as you wish, no matter if PP or SE

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Can this amp achieve the sound quality of an SET amp?
If you want the SE sound character that stay SE IMHO

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Thomas
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Old 2nd March 2013, 06:06 PM   #3
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Some information: push pull 45

Quote:
So far I have used the 45 only in Single Ended but will build a PP amp with them some time.
as the thread is about PP, I think it is not a problem to ask if you can tell a bit more about your ideas regarding PP implementaion? I learned a lot from your publications on SE, LCRs, amplifier construction, damper diodes usage, etc, and I am curious how you would tackle PP!
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Old 2nd March 2013, 06:57 PM   #4
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Thomas,
Thanks alot for replying, it has come to my attention recently that a 45 PP amp is available. I didn't know the 45 tube was ever used in this configuration and was wondering about the noise control. I have been led to believe that more power equals more noise...
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Old 2nd March 2013, 06:59 PM   #5
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Hi Erik,

I did not really start to work on it yet. I will rebuild a fully differential phono stage design which I had years ago first. I will probably apply some aspects from that design. Fully differential from in to out, choke in the cathode, common to both tubes. IT coupled.

But its too early really...

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Old 2nd March 2013, 07:06 PM   #6
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Hi!

Quote:
Originally Posted by jcmusic View Post
I have been led to believe that more power equals more noise...
Not necessarily. Push Pull circuits actually have better power supply noise rejection as Single ended, so they would typically be quieter than a SE with a similar power supply.

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Old 2nd March 2013, 07:12 PM   #7
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In properly designed SE or PP amplifiers achievable output power has virtually nothing to do with noise assuming that system gains are distributed in a reasonable manner. I'd read Pano's treatise on this topic. (Gain Distribution)
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Old 2nd March 2013, 07:55 PM   #8
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from a post three years ago:
Marcel and Clovis

I heard Marcel and Clovis by Phil Sieg at VSAC two days before 9/11. It was
driving some Audio Classic horns, and I have not heard better. Perhaps some
as good, but none better.

http://www.tubesrit.com/audio/albums...s_DHT_PP45.pdf


still true for me,

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Old 2nd March 2013, 07:57 PM   #9
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Hi. The link http://www.tubesrit.com/audio/albums...s_DHT_PP45.pdf is not working.
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Old 2nd March 2013, 08:02 PM   #10
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I don't know why it picked up the ellipsis. This should work:

http://www.tubesrit.com/audio/albums...s_DHT_PP45.pdf

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