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Old 29th August 2012, 09:43 AM   #2841
Salas is offline Salas  Greece
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Quote:
Originally Posted by mikelm View Post
Do you notice degradation even if you have a small cap in parallel...

...any thoughts on that ?

mike
I have seen a 0.1uF MKT capacitor across all cathode auto-bias fuses in all Jadis tube equipment.
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Old 29th August 2012, 11:51 AM   #2842
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I have seen a 0.1uF MKT capacitor across all cathode auto-bias fuses in all Jadis tube equipment.
I wonder what can be the purpose of this cap ? To prevent the fuse from blowing with very high HF ? To prevent the spark when the fuse blows ?
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Old 29th August 2012, 12:21 PM   #2843
Salas is offline Salas  Greece
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Spark I guess is the primary goal, as I have seen highly biased tubes failing violently near their life's end. I wouldn't be surprised if that most respected artisan French tube amps company has some subjective sonic beliefs about using them also.
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Old 29th August 2012, 12:26 PM   #2844
mikelm is offline mikelm  England
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The purpose of the cap is to partially absorb any noise caused by poor connection between fuse & fuse holder
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Old 29th August 2012, 12:32 PM   #2845
Salas is offline Salas  Greece
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That, or some little HF part of non linear cathode feedback signal added by the fuse as it merrily passes bias swing in series with the cathode resistor? They use resistive auto-bias in almost all their models.
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Old 29th August 2012, 01:23 PM   #2846
jayadev is offline jayadev  India
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This thread has taken me into different dimension of world.

@Shaan ,Awesome PCB soldering/wiring there, beautiful !

Last edited by jayadev; 29th August 2012 at 01:27 PM.
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Old 29th August 2012, 01:32 PM   #2847
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Quote:
Originally Posted by mikelm View Post
we await with interest
Below find input section of 1) 1995 German Class H high power PA amp Input circuit. (See the similarity of the amp presented in this thread.
2) Sony N1 CFB from 90s. (I like this circuit, see the twist in the vas.

Pioneer models still to come, I am having problems getting schematics in electronic form.
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Last edited by homemodder; 29th August 2012 at 01:37 PM.
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Old 29th August 2012, 04:24 PM   #2848
DIGORA is offline DIGORA  Belgium
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Do you know the Pioneer Super Linear Circuit ?

This circuit could be adapted to use a current feedback as SSA?


the Headphone amplifier
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Old 29th August 2012, 04:28 PM   #2849
dadod is offline dadod  Croatia
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Quote:
Originally Posted by homemodder View Post
Below find input section of 1) 1995 German Class H high power PA amp Input circuit. (See the similarity of the amp presented in this thread.
2) Sony N1 CFB from 90s. (I like this circuit, see the twist in the vas.

Pioneer models still to come, I am having problems getting schematics in electronic form.
2) That is Hawksford enhaced cascode.
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Old 29th August 2012, 04:40 PM   #2850
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Originally Posted by DIGORA View Post
Do you know the Pioneer Super Linear Circuit ?
This circuit could be adapted to use a current feedback as SSA?
the Headphone amplifier
If i make no mistake, the Pioneer Super Linear circuit used no global negative feedback, apart DC servo. So, the response would be: no.
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