Google Search  |  Meridian Systems  |  Meridian Streaming  |  Restaurant  |  WiKi  |  Duncan's Meridian Info  |  Board Rules  |  Restaurant Rules
Topic Options
Rate This Topic
#159961 - 2012-02-03 13:19 556 Power-Amp Help
JamesBrennan4 Offline
Harmless

Registered: 2010-01-20
Posts: 24
Loc: Florida, USA
I have just acquired a 556 power-amp, the amp is functioning fine, but heatsinks remain cold.

How do I remove the top cover?
Are there any bias current or output balance adjustments.
Is it possible to obtain a schematic?
_________________________
508.20, 501, 541, 561, 505, 555, 556, Definitive Technology Mythos ST SuperTower, Definitive Technology Subwoofer.

Top
#160026 - 2012-02-04 22:58 Re: 556 Power-Amp Help [Re: JamesBrennan4]
ChrisLayerUK Offline
Vogon Civil Servant

Registered: 2004-12-09
Posts: 4132
Loc: Colchester, Essex, UK
Hi, if the heatsinks are cold and it is running well, I don't see a problem. The heatsinks are designed to dissipate heat generated so it looks like you are in a very well ventilated position or you are not driving the amp very hard.

Turn it up and see what happens.

You may want to list what speakers you are driving with it.

Just thoughts and a "Bump" for you. Enjoy, Chris smile
_________________________
No 18 in the Hall of fame smile I have simple tastes; I am content to settle for the best: GIK monster bass panels, rear wall.
MC200 500GB, TwinStore 1TB, 596 v1.89.2, 518, G61R, M60.2 Rosewood, M33C, M30 MK2 Rears, M1500 Sub, Pure DAB, Foxsat HD, Pioneer 5090, Wii Chromecast for LRB videos into F80 (perfect)!!

Top
#160070 - 2012-02-05 07:13 Re: 556 Power-Amp Help [Re: JamesBrennan4]
MarkS Offline
Hitchhiker

Registered: 2003-09-22
Posts: 400
Loc: Wiltshire, England
I used to have a 556, and the heat sinks on mine remained cool.

Mark S

Top
#160081 - 2012-02-05 09:54 Re: 556 Power-Amp Help [Re: MarkS]
JamesBrennan4 Offline
Harmless

Registered: 2010-01-20
Posts: 24
Loc: Florida, USA
Thank you Chris and Mark for your comments.

Amplifier is driving a pair of Definitive Technology Mythos ST SuperTower (Floor-standing ultra-performance loudspeaker with built-in powered subwoofers).

Sensitivity :93 dB
Internal Subwoofer Amplifier Power :300 watts

Room dimensions are ~ 20' x 22' x 12' high.

Since speakers include subwoofer amplifier, I would agree with both of you that I am not driving amplifier hard.

Rest of system is 508.20 and 541.

Would still like to remove top glass cover and take look at the beautiful craftsmanship. Any guidance or hints would be gladly appreciated.
_________________________
508.20, 501, 541, 561, 505, 555, 556, Definitive Technology Mythos ST SuperTower, Definitive Technology Subwoofer.

Top


Moderator:  Carl, Duncs, Ludwig, ncpl, VirusKiller 
Who's Online
11 registered (Carl, bxd, Cortezzz, EllisDJ, 11ldp, GMT), 23 Guests and 1 Spider online.
Key: Admin, Global Mod, Mod
Newest Members
Boefje, Courant, Shiggins, Don Lee, Blickman
3874 Registered Users
Top Posters (30 Days)
Carl 95
Ludwig 87
Ronnie 85
dpstjp 78
ncpl 74
Top Posters
VirusKiller 10253
Fiddler 8205
ncpl 6646
Ian 5455
Carl 5408
Forum Stats
3874 Members
10 Forums
19055 Topics
198535 Posts

Max Online: 136 @ 2013-09-06 15:24

Meridian  |  Media Centre  |  Support  |  Firmware Release Notes  |  RSS Systems  |  RSS Streaming  |  RSS Restaurant