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Old 26th October 2008, 11:42 PM   #31
mlloyd1 is offline mlloyd1  United States
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terry:
that makes sense to me, too.
i was worried that changing the degeneration could change the spectral balance of the distortion, which doesn't sound like something you'd want to do when changing volume. however, (apologies to john) i have to admit i haven't thought it through.
i need my wife to go on a shopping trip so i can have time to play with some ideas ...


maybe justcallmedad will pop over soon and talk about his experiments ...

Quote:
Originally posted by Terry Demol
PMA,
Variable 1st stage degeneration??
On a fully balanced, open loop design why would you do it any otherway?
cheers
Terry
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Old 27th October 2008, 12:17 AM   #32
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We have used variable source degeneration in mike input amps in the past. It is Charles' way to be ahead of the pack, so to speak. So far it has worked for him.
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Old 27th October 2008, 05:38 AM   #33
Bonsai is offline Bonsai  Taiwan
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John,

'....because it usually has a time constant included in it that is called the 'dominant pole' that is often in the audio range, and sometimes below 10Hz.'

One way around this is to use a CFA topology - its then very easy to put the dominant pole way above the audio band. I think its easier in CFA's (discrete) to tailor the open loop gain as well. My next pre-amp will do this with, I am planning, switchable loop gain from the front panel via some small signal relays. Should be interesting to compare how the sound is affected, but first I will complete my 4562 based design in the next 4 weeks.
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Old 27th October 2008, 02:20 PM   #34
sreten is offline sreten  United Kingdom
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Hi,

Congratulations are due for a good sounding line level pre-amp @ $18,500 ?

/sreten.
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Old 27th October 2008, 07:05 PM   #35
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my friend, an owner of Ayre's KX-R(serial no. 1xx) keeps complaining the low gain.......................
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