operatereliablyandiftriggeringofprotectivede

 

vicesis tobeavoided. Theprecedingis

particularlytrueofamplifierswhichhaveextremel

 

ywideaudiobandwidth,suchasADCOM

amplifiers.Amongtheundertakingswhichmustbeav

 

oided,ifdamagetotheamplifierorto

theloudspeakersbeingusedistobeprevented,are

actionssuchasconnectingtheinputs

or outputs to or from the amplifier while the ampli

 

fier is ON, or using what has been

commonlytermedthe"thumbtest"thatis,touchin

 

gthecenterpinoftheRCAjackonone

endoftheaudiointerconnectingcablewhiletheot

 

herendispluggedintotheamplifierand

theamplifierisON.

 

 

 

 

 

 

 

 

NOTE

 

 

 

IntheeventthattheDCRAILFUSESneedtoberepl

 

aced,onlyoneofthefusetypeslisted

inthetablebelowshouldbeused.Pleasenotethat

 

thefuseslistedinthetable,andtheir

timecurrentblowingpoints,havebeencarefullyse

lectedandthoroughlytestedtodel

iver

optimal performance while still accomplishing their

protective functions. Replace these

fuses,individually,onlywiththespecifictypesl

isted. DO NOT USE ANY SUBSTITUTE

FUSES WITH DIFFERENT RATINGS, TIME-CURRENT CURVES OR VALUES. Failure

to observe this precaution may cause serious damage

to the amplifier circuits,

MAY

CREATE A FIRE HAZARD, AND MAY VOID YOUR WARRANTY. Foryourconvenience,

areplacementsetoftwoofthecorrectDCRAILFUS

 

ESissuppliedwitheachamplifierto

facilitaterestorationoftheamplifiertooperatio

nintheeventofablownfuse.

 

 

 

 

 

 

The GFA555ms has a massive power supply which rema

ins charged for up to FIVE

MINUTES aftertheamplifier is turned offand thePOWERLEDceases toglow. It also

remains energized when thePOWER. LEDglows evenif

 

 

theTHERMAL PROTECTION

LED is ON. Therefore, you should exercise great caution when

connecting arid/or

disconnectingloudspeakerstoorfromtheRIGHT/LEF

 

TSTEREOSPEAKEROUTPUTS.

Should you inadvertentlyshort out the RED ("+") an

d BLACK ("") STEREO SPEAKER

OUTPUTS,enoughpowermayremaininthepowersuppl

 

ytocausesufficientcurrentto

blow the DC RAIL FUSES on the affected channel. Whe

 

 

n connecting or disconnecting

loudspeakers to or from the RIGHT/LEFT STEREO SPEAK ER OUTPUTS, always be certaintowaitatleast FIVE MINUTES afterturningtheamplifier OFF beforeundertaking anysuchprocedure.

DC RAIL FUSES

BUSSMAN

AGC-7/250V

LITTELFUSE

3AG312007/250V

BEL

3AG 7A/125V

Page 12
Image 12
Adcom GFA-555MS manual May, Tstereospeakeroutputs, DC Rail Fuses Bussman, Littelfuse, Bel

GFA-555MS specifications

The Adcom GFA-555MS is a high-performance power amplifier that has established a reputation for its reliability and excellent sound quality. This amplifier, developed by Adcom, an American audio company known for producing high-quality audio components, is often sought after by audiophiles and professionals alike for its unique features and robust build.

One of the standout characteristics of the GFA-555MS is its impressive power output. With a continuous power rating of 200 watts per channel into 8 ohms, and even more when driving lower impedances, it provides ample power to drive a wide variety of speakers. This ensures that users can enjoy dynamic sound reproduction, whether they are listening to music at moderate volumes or cranking it up for a party.

The GFA-555MS is designed using a high-current, Class AB topology, which strikes a balance between efficiency and sound fidelity. This design allows for clean, detailed audio reproduction while minimizing distortion. The amplifier is renowned for its ability to handle complex musical passages and reproduce them faithfully, making it a favorite among music lovers who appreciate the nuances of their favorite recordings.

Another notable feature is its advanced thermal management system. The GFA-555MS is equipped with substantial heat sinks and a robust power supply that allows it to operate efficiently without overheating. This is particularly beneficial for sustained listening sessions or when driving demanding speaker loads.

In terms of connectivity, the GFA-555MS offers various input options, including RCA and XLR connections, making it versatile enough to integrate into a range of audio systems. This flexibility is complemented by its exceptional build quality, with a solid chassis that not only enhances durability but also minimizes vibrations that could interfere with sound quality.

The amplifier also includes additional features such as DC protection circuitry and a comprehensive output stage protection system. These safeguards help protect both the amplifier and the connected speakers from potential damage due to short circuits or overheating.

Overall, the Adcom GFA-555MS stands out in the realm of audio amplifiers. Its combination of power, sound quality, and advanced technologies make it a preferred choice for both casual listeners and serious audiophiles. Whether for home theater setups or music playback, the GFA-555MS delivers performance that is hard to match, making it a true classic in the audio world.