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Old 8th June 2014, 11:54 AM   #1
Bonsai is offline Bonsai  Taiwan
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Default New Bonsai Preamp

This is my new pre. It uses opamps all biased into class A with discrete high current buffers in the feedback loop. Baxandall tone controls that can be fully bypassed. Selection for up to 7 inputs and place for MM/MC equalizer. 2W class A headphone amp. Uses a Goldpoint volume control. Buffered tape loop. Still a few more weeks or work on the mechanics, and then the wiring. I've had it running just hooked up and on the bottom of my equipment stand for a few months - made a few tweaks as a result, but overall the sound is very open and smooth. I think this is my best pre ever.

Here is the link to my website - you can download the PDF from there (about 9 MB ~60 pages)

http://hifisonix.com/ovation-symphon...-preamplifier/
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Last edited by Bonsai; 16th July 2014 at 05:28 AM.
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Old 8th June 2014, 12:24 PM   #2
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Originally Posted by Bonsai View Post
This is my new pre. It uses opamps all biased into class A with discrete high current buffers in the feedback loop. Baxandall tone controls that can be fully bypassed. Selection for up to 7 inputs and place for MM/MC equalizer. 2W class A headphone amp. Uses a Goldpoint volume control. Buffered tape loop. Still a few more weeks or work on the mechanics, and then the wiring. I've had it running just hooked up and on the bottom of my equipment stand for a few months - made a few tweaks as a result, but overall the sound is very open and smooth. I think this is my best pre ever.
Schematics, or it does not exist .

Ok, congratulations on your best pre to date...I am fully confident in your abilities and results.
Those Goldpoint volume control/attenuators are pricey....obviously you consider that they are worth the investment...what's your overall impression of them ?.
Buffered tape loop...why go to the trouble nowadays ?.

I also like your no nonsense 'retro' form factor...none of that modern boutique styling silliness.

Dan.
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Old 8th June 2014, 12:58 PM   #3
Bonsai is offline Bonsai  Taiwan
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Schematics will come in due course.

Tape buffer is simply for recording - however you decide to do that.

And yes it's very retro.

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Last edited by Bonsai; 8th June 2014 at 01:03 PM.
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Old 9th June 2014, 03:10 AM   #4
Zero D is offline Zero D  United Kingdom
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Looks very pro

A tape buffer is always a useful addition

Watching with interest !
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Old 9th June 2014, 03:14 AM   #5
a.wayne is offline a.wayne  United States
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Retro, i like retro ...........
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Old 9th June 2014, 11:33 AM   #6
maxw is offline maxw  United Kingdom
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Better than your PGA2320 based pre?

How are you attenuating? A pot?

Inside pics or that nice case is just empty
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Old 9th June 2014, 11:42 AM   #7
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Better than your PGA2320 based pre?
How are you attenuating? A pot?
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....Uses a Goldpoint volume control.
Dan.
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Old 9th June 2014, 02:54 PM   #8
Bonsai is offline Bonsai  Taiwan
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Old 9th June 2014, 02:57 PM   #9
Bonsai is offline Bonsai  Taiwan
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I prefer the sound compared to the PGA2320. But, this of course is purely my view. The tone controls give some added flexibility that you don't get with a straight line pre.
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Old 9th June 2014, 04:03 PM   #10
AndrewT is offline AndrewT  Scotland
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Could you talk, or draw, us through the grounding philosophy of all those RCAs on the In/Outs?
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