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Accession (phono preamp)
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Graham Slee View Drop Down
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    Posted: 05 Sep 2015 at 9:38pm
The Accession phono preamp is here...

Accession Phono Preamp

Output level control can act as volume control in a vinyl only system, but was intended to get the levels right into A-D converters.

There is also a fixed level ouput.

Stereo/mono switch is standard.

Three record EQ settings: RIAA; British (FFRR); American (NAB/NARTB).

Cartridge only EQ for those wanting to apply their own record EQ (CA/Flat). In this position the CV output of the cartridge is changed to CA (constant velocity to constant amplitude).

Accession Rear Panel

Below the usual turntable ground you will see additional capacitive loading: 100pf and 220pf for each channel.

Inputs and outputs are on gold plated 360 degree shielded phonos (RCAs).

The 24V DC socket accepts power from the PSU1.

All inputs EMC and ESD protected, including power.

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Ash View Drop Down
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Points: 4360 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ash Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2015 at 9:44pm
Looks like someone has been a busy man. Explains your recent lack of forum activity. Looks great Graham.
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Chris Firth View Drop Down
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Points: 1665 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Chris Firth Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2015 at 10:25pm
Excellent Graham Smile

That volume control will put an end to input clipping on ADCs when using a MM with a high output - I'm thinking specifically of the Goldring 1042 and similarly derived cartridges (DNM Reson Reca/Mica, Roksan derivatives etc).
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BAK View Drop Down
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Points: 1831 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BAK Quote  Post ReplyReply Direct Link To This Post Posted: 06 Sep 2015 at 12:31am
Originally posted by Graham Slee Graham Slee wrote:

The Accession phono preamp is here...

Cartridge only EQ for those wanting to apply their own record EQ (CA/Flat). In this position the CV output of the cartridge is changed to CA (constant velocity to constant amplitude).


 This may be able to connect into a crystal cartridge phono input... making the MM cartridge closely match the crystal cartridge output frequency curve... as was used in the 1960's in valve (tube) HiFi days. 
 Graham has found that the crystal cartridge output was/is a constant amplitude (CA), and being non-magnetic, had no need for EQ of the magnetic properties of MM or MC cartridges.

Now he has an "Accession" phono preamp that can EQ the phono signal the same way it was done in the beginning!

The added features push this "over the top"!
Bruce
AT-14SA, Pickering XV-15, Hana EL, Technics SL-1600MK2, Lautus, Majestic DAC, Technics SH-8055 spectrum analyzer, Eminence Beta8A custom cabs; Proprius & Reflex M or C, Enjoy Life your way!
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Suggs View Drop Down
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Points: 520 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Suggs Quote  Post ReplyReply Direct Link To This Post Posted: 06 Sep 2015 at 6:46am
Looks like it should be a winner. Can't wait to listen to one...well done Graham for finally getting this into production Clap
Derek
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Drewan77 View Drop Down
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Points: 1544 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Drewan77 Quote  Post ReplyReply Direct Link To This Post Posted: 06 Sep 2015 at 9:04am
Great ! When will this be available to audition please?
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Points: 6197 		Post Options Post Options   Thanks (0) Thanks(0)   Quote morris_minor Quote  Post ReplyReply Direct Link To This Post Posted: 06 Sep 2015 at 10:15am
Originally posted by Chris Firth Chris Firth wrote:

Excellent Graham Smile

That volume control will put an end to input clipping on ADCs when using a MM with a high output - I'm thinking specifically of the Goldring 1042 and similarly derived cartridges (DNM Reson Reca/Mica, Roksan derivatives etc).

Indeed Chris! This, combined with the EQ and loading settings should make this a winner! Thumbs Up
Bob

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