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Interstage coupling feedback
Interstage coupling feedback
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Old 16th January 2012, 09:37 PM   #1
Ronken is offline Ronken
diyAudio Member
Join Date: Nov 2011
Default Interstage coupling feedback

Hi folks,
in an interstage coupled two stage tube amp, which kind of negative feedback can be applied? I read that a feedback loop from anode of the second tube to the cathode of the first tube has to be avoided as it is a loop wraped around a transformer coupled stage. So which feedback is to be prefered as the above mentioned often sounds good with cap coupling and is practical.
Thanks, Uwe
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Old 16th January 2012, 10:11 PM   #2
pieter t is offline pieter t  Netherlands
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Join Date: Apr 2009
When the interstage transformer is a good one, with good low and high frequency bandwidth (which is not that difficult to achieve with a 1:1 type), I see no problems applying a feedback loop as phase shifts will be minimal.
You can sooner expect problems with a feedback loop from amplifier output (after the output transformer) back into the amplifier circuit as phase shifts will be larger.
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Old 17th January 2012, 07:36 PM   #3
Ronken is offline Ronken
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Join Date: Nov 2011
Thanks, Pieter.
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