New Posts New Posts RSS Feed - Accession (phono preamp)
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Welcome to the Graham Slee Audio Products Owners Forum

 

Open to all owners plus those contemplating the purchase of a Graham Slee HiFi System Components audio product and wishing to use this forum's loaner program: join here (Rules on posting can be found here)

This website along with trade marks Graham Slee and HiFi System Components are owned by Cadman Enterprises Ltd


Accession (phono preamp)

 Post Reply Post Reply Page  123 16>
Author
Graham Slee View Drop Down
Admin Group
Admin Group
Avatar
Retired

Joined: 11 Jan 2008
Location: South Yorkshire
Status: Offline
Points: 16298
Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Topic: Accession (phono preamp)
    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.

Fully ground-planed board multi-point grounded to case - no more star earths!!!
That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
Back to Top
Ash View Drop Down
Senior Member
Senior Member
Avatar

Joined: 18 Mar 2013
Location: Dorset
Status: Offline
Points: 4334
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.
Back to Top
Chris Firth View Drop Down
Moderator Group
Moderator Group


Joined: 16 May 2013
Location: Rossendale, UK
Status: Offline
Points: 1529
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).

Back to Top
BAK View Drop Down
Senior Member
Senior Member
Avatar

Joined: 14 Mar 2010
Location: Kentucky, USA
Status: Offline
Points: 1744
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!
Back to Top
Suggs View Drop Down
Moderator Group
Moderator Group
Avatar

Joined: 07 Oct 2011
Location: France
Status: Offline
Points: 513
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
Back to Top
Drewan77 View Drop Down
Senior Member
Senior Member
Avatar

Joined: 25 May 2013
Location: Chester,England
Status: Offline
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?
Older than I once was, younger than I'll be
.............................
Andrew
Back to Top
morris_minor View Drop Down
Moderator Group
Moderator Group
Avatar

Joined: 27 Mar 2012
Location: Surrey
Status: Online
Points: 6015
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

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
Back to Top
 Post Reply Post Reply Page  123 16>
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.01
Copyright ©2001-2018 Web Wiz Ltd.

This page was generated in 0.141 seconds.