Purist 2 Line Amp

kmtang · 19th July 2005, 02:19 PM

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/Spi..._2.html#Purist

The difference between this with similar circuitry is that the first stage employs local feedback to reduce the distortion.

Johnny

kmtang · 19th July 2005, 02:21 PM

By the way, I used 6SN7 instead of 12AU7.

wa4swj · 19th July 2005, 07:26 PM

Hi Jonny,

My first post to this forum - How does your line amp sound? I've been very impressed with Norm's analysis of tube circuits and was wondering how you like the circuit. One fine day I'd like to build a copy of his "TENA" power amplifier - if I can ever get time!

Regards,

Ed Long

EC8010 · 19th July 2005, 07:43 PM

Welcome to the forum, Ed, I hope you enjoy it - you'll find the "Tubes" section quite busy.

Timbo in Oz · 20th July 2005, 04:19 AM

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

kmtang · 20th July 2005, 05:13 AM

I still haven't check the waveform and frequency response of the line amp.

I have listened to it for couple days. It sounds pretty good to me. It's rather airy, open sound, fast.

Johnny

19th July 2005, 07:26 PM	#3
wa4swj diyAudio Member Join Date: Jul 2005 Location: Belleview, FL	Hi Jonny, My first post to this forum - How does your line amp sound? I've been very impressed with Norm's analysis of tube circuits and was wondering how you like the circuit. One fine day I'd like to build a copy of his "TENA" power amplifier - if I can ever get time! Regards, Ed Long __________________ ------------ Ed Long

19th July 2005, 07:43 PM	#4
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	Welcome to the forum, Ed, I hope you enjoy it - you'll find the "Tubes" section quite busy. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

20th July 2005, 04:19 AM	#5
Timbo in Oz diyAudio Member Join Date: Feb 2003 Location: Canberra	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 __________________ Timbo

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19th July 2005, 02:21 PM	#2
kmtang diyAudio Member Join Date: Nov 2004 Location: Vancouver	By the way, I used 6SN7 instead of 12AU7.

20th July 2005, 05:13 AM	#6
kmtang diyAudio Member Join Date: Nov 2004 Location: Vancouver	I still haven't check the waveform and frequency response of the line amp. I have listened to it for couple days. It sounds pretty good to me. It's rather airy, open sound, fast. Johnny

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