I built this Purist 2 Line Amp but omitting the first stage. I thought I don't need too high the gain.
The details are in http://www.normankoren.com/Audio/Spice_preamp_2.html#Purist
The difference between this with similar circuitry is that the first stage employs local feedback to reduce the distortion.
Johnny
The details are in http://www.normankoren.com/Audio/Spice_preamp_2.html#Purist
The difference between this with similar circuitry is that the first stage employs local feedback to reduce the distortion.
Johnny
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what AUthority do you have for the saturation on the Leak St 2O
was it in a published test, I doubt it was Haden Boardman.
First up the tests of the original way back by Hifi-News&RR, reported some 11 watts @ 20 Hz, and similar for the same OPT's on the 12 Plus.
And as stated in my post in response I measured 20 Hz @ 20 watts in pentode mode with just 1.5%D, with lower total feedback and a CCS on the different splitter tubes, I used 6CG7's. for this.
Further I have run the pentode chassis item into EBS 300 liter 15inch DC gold Tannoys, measured 20 hz sine waves at 98 decibels and b-all doubling. Okay?
As I said the bass limitaions in the Leaks in OEM form may have more to do with the PSU, I can't remember the model no. on my OPT's but there were several different iterations in the St20's life. I was told by the unofficial Leak site owner and writer of the recent book, that the ones I have are quite up to the job.
Timbo,
puzzled
was it in a published test, I doubt it was Haden Boardman.
First up the tests of the original way back by Hifi-News&RR, reported some 11 watts @ 20 Hz, and similar for the same OPT's on the 12 Plus.
And as stated in my post in response I measured 20 Hz @ 20 watts in pentode mode with just 1.5%D, with lower total feedback and a CCS on the different splitter tubes, I used 6CG7's. for this.
Further I have run the pentode chassis item into EBS 300 liter 15inch DC gold Tannoys, measured 20 hz sine waves at 98 decibels and b-all doubling. Okay?
As I said the bass limitaions in the Leaks in OEM form may have more to do with the PSU, I can't remember the model no. on my OPT's but there were several different iterations in the St20's life. I was told by the unofficial Leak site owner and writer of the recent book, that the ones I have are quite up to the job.
Timbo,
puzzled
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