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Old 7th February 2012, 05:13 PM   #631
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by danielwritesbac View Post
Thank you! That is a great idea, but I need some help with it.

The added jfet buffer is one way that I could ensure that the amplifier performance remains more likely constant between sources and not have me unnecessarily troubleshooting for a very long time like a puppy chasing its tail until dizzy. Help! How do I install this jfet? Could you provide a schematic example of how to install the jfet to the Circlophone at post 1?

I believe that the added part will help promote reliably repeatable results as well as greater compatibility to various sources of which there is vast variety. And, that variety needs tamed a bit. Jfet buffer?

P.S.
At that point, the very next question would be ideal specs for jfet shopping.
Something like the Pass B1 would be suitable:
www.passdiy.com/pdf/B1%20Buffer%20Preamp.pdf

I may have something cleverer in my "organ bank", I'll make some searching.
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Old 8th February 2012, 12:04 AM   #632
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Maybe sort of like an inbuilt something? Like a streamlined, matching, piece of the amplifier rather than a whole different add-on unit?
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Old 8th February 2012, 01:09 AM   #633
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Quote:
Originally Posted by danielwritesbac View Post
Maybe sort of like an inbuilt something? Like a streamlined, matching, piece of the amplifier rather than a whole different add-on unit?
What about an op amp buffer? You could give it some gain if you wish, and drive it from zenered or regulated supplies from the main amplifier supply depending how high it is. This would provide very low output impedance and solve your problem very simply.
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Old 8th February 2012, 02:14 AM   #634
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the amp itself has a loop gain of 200, now that is more than anything i have encountered before....

but a unity gain buffer with high input impedance will fit this amp well.....like the B1....
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Old 8th February 2012, 02:15 AM   #635
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Quote:
Originally Posted by danielwritesbac View Post
Maybe sort of like an inbuilt something? Like a streamlined, matching, piece of the amplifier rather than a whole different add-on unit?

good idea.....
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Old 8th February 2012, 09:51 AM   #636
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Its only a "good" idea if it fixes something,
or simplifies without breaking something.

Therefore I don't pretend to have any good ideas.

Last edited by kenpeter; 8th February 2012 at 09:55 AM.
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Old 8th February 2012, 01:53 PM   #637
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by danielwritesbac View Post
Maybe sort of like an inbuilt something? Like a streamlined, matching, piece of the amplifier rather than a whole different add-on unit?
Here is a suitable buffer to match the Circlophone, clever enough not to degrade its performances:
Attached Images
File Type: gif Circlophone14.GIF (30.3 KB, 535 views)
File Type: gif JfBuf.GIF (52.7 KB, 455 views)
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Old 8th February 2012, 04:58 PM   #638
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Anyone building CFP Circlophone ? I wonder if it is going to supersede original one in terms of sonic behaviour. It seems it is not that easy to graphically modify current pcbs respecting cfp modifications.

RC zobel at output reversed in CFP version.. misprint?
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Old 8th February 2012, 05:24 PM   #639
Elvee is offline Elvee  Belgium
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Originally Posted by terranigma View Post
Anyone building CFP Circlophone ?
I will try it, one of these days.

Quote:
It seems it is not that easy to graphically modify current pcbs respecting cfp modifications.
Inserting Q7 and Q8 in the LTP should be possible cleanly, with a bit of reflection.
The mod in the feedback cap can be wired "in the air".

Quote:
RC zobel at output reversed in CFP version.. misprint?
Reversed? What do you mean?
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Old 8th February 2012, 05:32 PM   #640
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Reversed? What do you mean?
5R6 and 22nF.. 5R6 is connected to output at original but it is connected to ground at CFP. Vice versa for 22nF.
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