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Old 13th January 2009, 01:09 PM   #131
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homemodder,
I comprehend.

The turn-off "artifact" is well-known, can be cured by class A biasing only.
Many buoyant attempts have been made to get rid of the unpleasant crossover distortion in other ways, unfortunately, I don`t think it`s possible.
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Old 13th January 2009, 02:09 PM   #132
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Cant get rid of, but can be significantly reduced, Im trying something similar now with a triple but its more tricky here because of stability problems.

Do you mean having the cfp in class a ?? I already use the cfp in class a. Look at stee s example of cfp ef.

What I dont like is the extra complexity to achieve this but it has good sonic merits, when I remove the extra circuitry the human voices seem to have like a glare at the end of a sung word and with it it dissapears, cymbals become very detailed with the extra circuitry too. When listening at 200 300 watt levels the crossover artifacts sound horrible.
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Old 13th January 2009, 03:01 PM   #133
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Quote:
Do you mean having the cfp in class a ?? I already use the cfp in class a.
Yes, but I expect much worse distortion for instance in the output stage.
Quote:
When listening at 200 300 watt levels the crossover artifacts sound horrible.
Along with various other artifacts.
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Old 13th January 2009, 09:48 PM   #134
Stee is offline Stee  Italy
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Default about JOY

The turn-off "artifact" is well-known, can be cured by compensation biasing only

this resistor's value are not simulated, just for example
(I'm not able to use)
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Old 14th January 2009, 06:33 AM   #135
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Default it is very nice to see

at least that some forum members are
solid rock value !!!!! the ratio as we speak remains ..... one post one schematic !!!!! way to go stee !!!

i am just jocking but i think that if i ever had the time to analyze all schematics posted by stee it will take something like a year ...

thanks people
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Old 14th January 2009, 03:13 PM   #136
catalin is offline catalin  Romania
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not have time for practical testing .
Thd (5khz) with 5 harm =0.0002 %
Slew rate = 250 V/uS
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Old 14th January 2009, 03:36 PM   #137
AndrewT is offline AndrewT  Scotland
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C32 is too small.
It needs to be >= 22k/680r * sqrt(2) * 4u7F >= 215uF. Use 220uF.

C42 seems a bit big @ 47pF
R = 150 at output also seems big, only 8mA passing Q60 & 51.

Does the mirror load on the LTPs work when you have dual complementary VAS?
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Old 14th January 2009, 04:00 PM   #138
roender is offline roender  Romania
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Quote:
Originally posted by catalin
not have time for practical testing .
Thd (5khz) with 5 harm =0.0002 %
Slew rate = 250 V/uS
Catalin,

May I suggest you to not reference CCS's biasing resistors to ground?
Try to make the input stage + VAS as much as possible a constant current compound stage.
Keep the ground as clean as possible and use a separated PSU for output stage, and for inputs stages a good ccs+shunt feedbackless PSU

Regards,
Mihai
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Old 14th January 2009, 04:24 PM   #139
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Quote:
[i]

Does the mirror load on the LTPs work when you have dual complementary VAS? [/B]

Nope, only in simulation, I hope no one tries to build it, output offset will be all over the place, the current mirror issue with complementary ltps has been discussed many times, rather try a cascode on the ltps. Do a search here of randy slones designs. He eventually had to change his current mirror designs because of this.
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Old 14th January 2009, 04:27 PM   #140
catalin is offline catalin  Romania
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Quote:
Originally posted by AndrewT
C32 is too small.
It needs to be >= 22k/680r * sqrt(2) * 4u7F >= 215uF. Use 220uF.

C42 seems a bit big @ 47pF
R = 150 at output also seems big, only 8mA passing Q60 & 51.

Does the mirror load on the LTPs work when you have dual complementary VAS?

Andrew ,where do you get that calculation (>= 22k/680r * sqrt(2) * 4u7F ) ?
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