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Old 12th September 2013, 06:19 AM   #1
h_a is offline h_a  Europe
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Default The high octane phono preamp

In case somebody has questions about my high octane phono preamp (published in the current Linear Audio issue #6), please feel free to ask here or by pm.

I'll try to be helpful

It's a minimalist 3 transistor design, so easy to build. Oh and it also sounds great!

I will later also upload the schematic here.
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Old 12th September 2013, 07:07 AM   #2
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Old 12th September 2013, 07:10 AM   #3
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I can help getting good quality PCBs.

Regards,
Sachin
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Old 12th September 2013, 11:32 AM   #4
DUG is offline DUG  Canada
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I am interested in the schematic.
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Old 13th September 2013, 10:38 AM   #5
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This sounds interesting.
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Old 14th September 2013, 06:56 AM   #6
h_a is offline h_a  Europe
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Default schematic

Hi all,

thanks for your interest!

This is the schematic of the high octane phono pre.

Maybe I should have said earlier that it does not comply at all with the current rules of 'good' circuit design:
  • it uses bjts instead of jfets
  • active RIAA instead of a passive one
  • quite some negative feedback instead of running open loop

At least it uses a shunt regulator as power supply

It can be build into a 10x8cm large box.
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File Type: jpg high_octane_sch_bw_s_corr2.jpg (353.3 KB, 858 views)
File Type: jpg high_octane.JPG (205.8 KB, 795 views)
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Old 14th September 2013, 07:24 AM   #7
freddi is offline freddi  United States
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cool! - I like single ended RIAA preamps in general
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Old 15th September 2013, 11:08 AM   #8
h_a is offline h_a  Europe
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The starting point for this single ended circuit is a 3 transistor circuit from H.P. Walker and dates back to the 60ies. There is some information also in Douglas Self's book on small signal design!

On a side note, the opamp shunt regulator with its excellent performance is originally from Ovidiu (synesthesia) and the particular frequency compensation scheme from Edmond Stuart.

The points denoted as SENSE are for remote sensing used by the shunt regulator, such that the voltage is regulated directly at the first stage!
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Old 14th November 2013, 05:26 AM   #9
h_a is offline h_a  Europe
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To aid with building the preamp, the Gerber files with BoM and building tips are now also available; you can find them at

Online Articles

Happy building!
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Old 14th November 2013, 05:31 AM   #10
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Thanks h_a for nice work.I can help members with good quality PCbs if you decide for a GB.I think there should be enough interest here.

Regards,
Sachin
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