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 |
Gram Amp2 power supply |
Post Reply | Page 12> |
Author | |
martynyesfan
New Member Joined: 09 Mar 2016 Status: Offline Points: 7 |
Post Options
Thanks(0)
Posted: 25 Sep 2016 at 5:44pm |
Hi All -
very pleased with the sound of my Gram amp 2 which I've had for a few months now. Reading through the installation instructions I can see that an unfiltered supply should be used - as I'm in possession of a T----a mains filter please could someone tell me why it's best not to use it! I'm assuming it's ok to use it to power the amp?
|
|
Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
Post Options
Thanks(0)
|
Signal Return Currents:
Kirchoff's Law tells us that at any point in a circuit the algebraic sum of the currents is zero. This tells us that all currents flow in circles and, particularly, that the return current must always be considered when analyzing a circuit... Where does current come from? Power station ultimately, although most current in a circuit returns to a low impedance source in its power supply if "stiff" enough. However, some returns further back, which might be a transformer secondary. Further back than that will be a local substation - it's obviously flowing from there so it must return to it (along with all the other current everything else on the block is using of course - but those few micro-amps don't evaporate). Filters (usually) place inductors in both line and neutral meaning return current has to negotiate the neutral inductor, and that's not "stiff" at all frequencies a modern circuit operates at (although far beyond the audible spectrum). Mind you, there are HF losses in power wiring, but not as much as an intentional inductor. Therefore it is no surprise that a circuit having a closure frequency up in the low MHz (high gain circuits such as phono stages) sometimes sound different when used with and without mains filters. Some bright spark might say "well, the HF decoupling must be crap in such a circuit" to which I reply they all are due to parasitics. It's just that after all my years I take nothing for granted. And so the capacitors in a mains filter won't go very high in frequency either. You know, its one of those things some people hear and others don't. We heard it and thought it worth mentioning. Some will and do think we're stupid making such comments but I don't give a hang... It's not Beltism. |
|
That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
|
|
Ernie
Senior Member Joined: 23 Jan 2014 Location: Birmingham UK Status: Offline Points: 386 |
Post Options
Thanks(0)
|
Hi Graham, as you suggest leaving GSP kit "always on", is it wise to protect it some how? There are a miriad of devices out there some even reported to make your Hifi sound better (I'm an disbeliever btw). Should some kind of surge protection be used or is it a waste of time? I mean from a protection point of view. I've a Majestic, Proprii, Era V set up (always powered) and I do wonder if I should have some surge protection. If yes any suggestions? |
|
There are 10 kinds of people. Those who understand binary and those who don't.
|
|
Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
Post Options
Thanks(0)
|
A mains surge arrester is a good idea if you can get one without a filter.
A quick search found this: http://www.viking-direct.co.uk/catalog/catalogSku.do?id=6978168 |
|
That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
|
|
martynyesfan
New Member Joined: 09 Mar 2016 Status: Offline Points: 7 |
Post Options
Thanks(0)
|
Graham - many thanks for the quick response even if some of it was over my head! I took notice of the phono stage's instructions when I first installed it and avoided plugging it in to the filter. Cheers, Martyn
|
|
pcourtney
Regular Joined: 12 Feb 2015 Location: Stansted Status: Offline Points: 59 |
Post Options
Thanks(0)
|
would the 4 way be OK as well Graham
http://www.viking-direct.co.uk/catalog/catalogSku.do?id=6978186 I can't see anywhere on those product sheets where it says if it has filters or not :-(
|
|
GS Accession MM Pre, Red Wine Audio Signature 30.2 Amp and AKG K-1000 headphones
|
|
Graham Slee
Admin Group Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16298 |
Post Options
Thanks(0)
|
It appears to be simply a surge arrester.
|
|
That none should be able to buy or sell without a smartphone and the knowledge in how to use apps
|
|
Post Reply | Page 12> |
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 |