Copyright © 1998
Cadman Enterprises Ltd
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 |
Power Supply for Gram Slam 1 |
Post Reply |
Author | |
Brennythefox
New Member Joined: 14 Feb 2023 Location: Warwickshire Status: Offline Points: 9 |
Post Options
Thanks(0)
Posted: 14 Feb 2023 at 12:40pm |
Hi. I am a newbie to Graham Slee products and have been given a Gram Amp 1 phono stage without a power supply. I can see no information on the device as to what is required and don't want to just assume that it is the same as the current phono stages. It looks like a Gram Amp 2 Communicator exterior but clearly an older or more budget model. I have tried looking on this forum but unable to find the information I require. All help greatly appreciated.
Edited by Brennythefox - 15 Feb 2023 at 7:34am |
|
Brendan
Warwickshire UK |
|
ICL1P
Senior Member Joined: 04 Aug 2012 Location: Faringdon, Oxon Status: Offline Points: 2341 |
Post Options
Thanks(1)
|
I’m guessing you mean Gram Amp (not Slam) 1 like this: https://www.lpgear.com/product/GA1.html
|
|
Ifor
===== Reflex M & ACCESSION M, CuSat50, Majestic DAC, a Proprius pair. |
|
Fatmangolf
Moderator Group Joined: 23 Dec 2009 Location: Middlesbrough Status: Offline Points: 8960 |
Post Options
Thanks(2)
|
Welcome aboard Brendan. It probably needs a 24 volt power 'green' supply like the current models. If you give us the serial number Graham or John will confirm what is needed.
|
|
Jon
Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC. |
|
Brennythefox
New Member Joined: 14 Feb 2023 Location: Warwickshire Status: Offline Points: 9 |
Post Options
Thanks(1)
|
Sorry about my mistake, post corrected, it is a Gram Amp 1 and also has Bridge written on it. Serial number is 0506-53
Thanks
Edited by Brennythefox - 15 Feb 2023 at 7:37am |
|
Brendan
Warwickshire UK |
|
Brennythefox
New Member Joined: 14 Feb 2023 Location: Warwickshire Status: Offline Points: 9 |
Post Options
Thanks(0)
|
Hi. Currently I am powering my Gram Amp 1 with a 15v supply. I believe from reading here that it should be a 24v supply. Will buying the 24v supply bring a noticeable improvement to the sound?
|
|
Brendan
Warwickshire UK |
|
Fatmangolf
Moderator Group Joined: 23 Dec 2009 Location: Middlesbrough Status: Offline Points: 8960 |
Post Options
Thanks(0)
|
Please proceed. It will give more headroom for the signal peaks and also means your Gram Amp is getting the 24 volts it was designed for.
|
|
Jon
Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC. |
|
Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
Post Options
Thanks(1)
|
The Bridge version of the Gram Amp 1 has an internal 18V regulator, so running it at 15V means the regulator isn't working. But is that 15V really 15V? There were two types of "wall wart": 1. the unregulated; 2. the regulated. The unregulated would do 20% more volts offload, and seeing the Gram Amp load is very light, it's classed as offload. So 15V plus 20% which represents 3V, makes it up to 18V. Still not enough as the built-in regulator needs 3V more than its 18V rating. As for the regulated variety, there's no mileage there as it just does the voltage written on the can. So, we would send them out with 18V unregulated "wall warts", because that 20% extra took it to 21.6V, which is 3.6V more, and plenty to do the job. So why not 24V? Well, at the time, it was legal to sell transformer type wall warts, and SMPS types weren't very popular especially for audio, and in the main SMPS didn't exist. So, at 24V plus 20%, that was 28.8V, which was still OK. BUT! There were some 24V unregulated wall warts that did 50% more, making 36V, and that exceeded the on-board regulator's limit, so that's why I specified 18V unregulated. And then in 2010, the Governator, and the European Union banned transformer wall warts, so that makers of SMPS wall warts could have all the money. Now, SMPS just come as regulated, so the voltage is exactly what's written on the can. So if it's a SMPS, the voltage needs to be 24V. Confusing? Yes, definitely, but that's not my fault. Blame Arnie and his fellow European politicians. |
|
That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
|
|
Post Reply | |
Tweet
|
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |