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Accession (phono preamp) |
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Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
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Posted: 05 Sep 2015 at 9:38pm |
The Accession phono preamp is here...
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). 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. Fully ground-planed board multi-point grounded to case - no more star earths!!! |
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That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
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Ash
Senior Member Joined: 18 Mar 2013 Location: Dorset Status: Offline Points: 4334 |
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Looks like someone has been a busy man. Explains your recent lack of forum activity. Looks great Graham.
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Chris Firth
Moderator Group Joined: 16 May 2013 Location: Rossendale, UK Status: Offline Points: 1529 |
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Excellent Graham
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
Senior Member Joined: 14 Mar 2010 Location: Kentucky, USA Status: Offline Points: 1744 |
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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"! |
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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
Moderator Group Joined: 07 Oct 2011 Location: France Status: Offline Points: 513 |
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Looks like it should be a winner. Can't wait to listen to one...well done Graham for finally getting this into production
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Derek
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Drewan77
Senior Member Joined: 25 May 2013 Location: Chester,England Status: Offline Points: 1544 |
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Great ! When will this be available to audition please?
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Older than I once was, younger than I'll be
............................. Andrew |
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morris_minor
Moderator Group Joined: 27 Mar 2012 Location: Surrey Status: Online Points: 6015 |
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Bob
Majestic DAC/pre-amp Accession MC/Enigma, Accession MM, Reflex M, Elevator EXP, Era Gold V Solo ULDE, Novo, Lautus USB and digital, Libran balanced, CuSat50 2 x Proprius + Spatia/Spatia Links |
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