Running a 2A3 at 5K

Ali Tait · Post by **Ali Tait** » Fri Sep 16, 2011 4:07 pm

Far too much compromising going on here!

Ali Tait · Post by **Ali Tait** » Fri Sep 16, 2011 4:08 pm

Nick wrote:I do have at least one more to build Bud, so I would be interested in getting a pair of yours for comparison purposes. I agree the Sowters are very nice, not expecting anything other than a comparison. Take it via email or PM if you prefer?

I'll be most interested in the outcome of this Nick.

JackOfAll · Post by **JackOfAll** » Fri Sep 16, 2011 4:24 pm

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JackOfAll · Post by **JackOfAll** » Fri Sep 16, 2011 4:25 pm

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Post by **Nick** » Fri Sep 16, 2011 5:36 pm

Yep, you are right 9CT:1

Mike H · Post by **Mike H** » Fri Sep 16, 2011 8:58 pm

JackOfAll wrote:
BudP wrote: The garble is an underlying deconstruction, something that I expect to hear with the levels of reproduction available, but hear as a, well, garble of the information. Not a distortion as such but a confusion in coherence and intelligability.
Thanks for the explanation.

Hysteresis? (Is that spelt right?)

pre65 · Post by **pre65** » Fri Sep 16, 2011 9:05 pm

Mike H wrote:
JackOfAll wrote:
BudP wrote: The garble is an underlying deconstruction, something that I expect to hear with the levels of reproduction available, but hear as a, well, garble of the information. Not a distortion as such but a confusion in coherence and intelligability.
Thanks for the explanation.
Hysteresis? (Is that spelt right?)

Looks right to me.

http://en.wikipedia.org/wiki/Hysteresis

Post by **Nick** » Fri Sep 16, 2011 10:49 pm

There is also Barkausen which I think Bud alludes to in the post.

BudP · Post by **BudP** » Fri Sep 16, 2011 11:12 pm

Nick, email is fine hpurvine at gmail and you know the rest.

Neal · Post by **Neal** » Fri Sep 16, 2011 11:28 pm

BudP wrote:Garble in an autoformer....hmmmmm

......So my problem with autoformers is 60 to 80 db down from the signal level.....

You are hearing something garbled 80db down from the signal level! Are you sure?

BudP · Post by **BudP** » Sat Sep 17, 2011 12:14 am

You are hearing something garbled 80db down from the signal level! Are you sure?

No. The only surety is that it is well underneath the typical signal level. I am pointing to the finishing resonances from a grand piano note, the information coming from the chassis after the sounding board decay is done. Or, the bow draw across the top string of a violin, that faintly coarse grainy shush, just after the note dies away. Or a non vocal reflection decay, from behind a chorale, when the reflection should only be that of voices. That level of signal.

This sort of minutiae gone wrong wears upon me. My wife points out that it is a sickness, this desire to hear the perspiration and oils popping from the skin of a musician, but there you have it.

Dave the bass · Post by **Dave the bass** » Sat Sep 17, 2011 6:01 am

BudP wrote:
This sort of minutiae gone wrong wears upon me. My wife points out that it is a sickness, this desire to hear the perspiration and oils popping from the skin of a musician, but there you have it.

Dunno if it helps (brother!) but you're not alone

DTB

andrew Ivimey · Post by **andrew Ivimey** » Sat Sep 17, 2011 7:35 am

'No. The only surety is that it is well underneath the typical signal level. I am pointing to the finishing resonances from a grand piano note, the information coming from the chassis after the sounding board decay is done. Or, the bow draw across the top string of a violin, that faintly coarse grainy shush, just after the note dies away. Or a non vocal reflection decay, from behind a chorale, when the reflection should only be that of voices. That level of signal. '

Yep - that's exactly it - it isn't always there and my search so far has attributed it to the amp or the speakers - I have never delved so deep as to blame the transformers.

Once heard - you're in serious trouble.

Mike H · Post by **Mike H** » Sun Sep 18, 2011 11:26 am

Dave the bass wrote:
BudP wrote:
This sort of minutiae gone wrong wears upon me. My wife points out that it is a sickness, this desire to hear the perspiration and oils popping from the skin of a musician, but there you have it.
Dunno if it helps (brother!) but you're not alone

DTB

lol ..

Make me think about the magnetizing current needed to get the core going before anything else happens.

Paul Barker · Post by **Paul Barker** » Sun Sep 18, 2011 12:49 pm

andrew Ivimey wrote:'No. The only surety is that it is well underneath the typical signal level. I am pointing to the finishing resonances from a grand piano note, the information coming from the chassis after the sounding board decay is done. Or, the bow draw across the top string of a violin, that faintly coarse grainy shush, just after the note dies away. Or a non vocal reflection decay, from behind a chorale, when the reflection should only be that of voices. That level of signal. '

Yep - that's exactly it - it isn't always there and my search so far has attributed it to the amp or the speakers - I have never delved so deep as to blame the transformers.

Once heard - you're in serious trouble.

The problem is Andrew, once you hear an OTL amp (which I am sure you have) you are left worrying considerably as to why output transformers are holding back so much.

audio-talk

Running a 2A3 at 5K

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