Jump to content

LWA Staff

SOLD: Adcom GFA555 Power Amplifier

Recommended Posts

Item: Adcom GFA555 200watt per channel Power Amplifier
Location: Len Wallis Audio HQ
Price: Was $390 StereoNet Special $320
Item Condition: Very good secondhand condition
Payment Method: Cash, Paypal, Credit Cards, Bank Transfer, ZipPay
  We can ship anywhere, POA
Extra information:  When released in the mid-1980s this amplifier was hailed as setting new standards in its field. In his 1985 Stereophile review Anthony H. Cordesman stated ‘It is so clearly superior to past amplifiers in the low- to mid-priced range—not to mention most amplifiers two to three times its price—that I can unhesitatingly recommend it for even the most demanding high end system’.  This unit has had one owner from new and was sold by us.



Share this post

Link to post
Share on other sites
This topic is now closed to further replies.

  • Recently Browsing   0 members

    No registered users viewing this page.

  • Similar Content

    • By peterpan
      Item:  PS Audio Stellar S300 Stereo Amplifier  black finish.
      Location: Adelaide
      Price:  $1650 includes postage in Australia
      Item Condition: as new, 6 months old has had no more than 20 hours use.
      Reason for selling:  NLR
      Payment Method: Pickup - Cash on pick up, direct deposit
      Extra Info:  prefer local sale, but have all original box so can post. 
      photos are not very good, but presents as new no marks etc.

    • By HiFi Collector Adelaide
      Item: PrimaLuna Prologue Premium Power Amplifier (available with Black or Silver front plate)
      Note matching Prologue Preamplifier is also available for purchase as new or ex-demo.
      Location: Bridgewater, SA
      Price: $2,470 (RRP $3,295)
      Item Condition: Brand new, full warranty - 2 years warranty (6 months tube warranty)
      Reason for selling: Discontinued model
      Payment Method: Card, PayPal, Cash, Bank Transfer
      Shipping: Ships with TNT Australia wide
      Extra Info: Can we switched from stereo to mono mode allowing for a second Prologue Poweramp to be configured as monoblocks - extra discount for ordering as mono pair! 


    • By synthz
      Item: Parasound JC1 - Power Amp Monoblock (x2) 400 watts @ 8 Ohm
      Location: Sydney
      Price: 6,500 6200
      Item Condition: Used
      Reason for selling: NLR. Settling in with tubes amp
      Payment Method: Pickup - Cash, Paypal, COD Only
      Extra Info: PICKUP ONLY - NO SHIPPING. Third owner. Age is around 6 years old. Still current model at their product range because it is just THAT good. I would like to sell these rather than being unused because I'm quite content with my tubes amp. Still have boxes available. Even though these are 400w / 8ohms each, Stereophile did a measurement test and the true numbers are somewhere around568w/8ohms each! Very powerful solid state amps that can drive any speakers on planet earth (even Bose!). I used these to power my Dynaudio C2 and they power them without any sweat, even though Dynaudio C2 are famous for being difficult to drive. Happy to provide demo for serious buyers. The amp was designed by the famous John Curl, read up the story about this amp and you will be convinced that this is a serious piece of engineering and they did not skim with the components inside either. There are minor scuff marks on the chassis which is quite normal for amps at this age. The JC1 runs in pure Class-A up to 25 watts at eight ohms, with its bias set to high and ten watts into eight ohms with the bias set to low.
      The sticker that you see on the back panel is from the first owner from repairing a power button and an LED, so it's a very minor repair.
      These amps are still being sold on hi-fi stores in Sydney for $9,000 EACH. So grab a massive bargain, it's a no brainer to get it at this price when you could have spent $18,000 for the pair.  
      Premier monaural amplifier
      Circuitry designed by legendary John Curl and CTC Builder
      Ultra-high bias Class A/AB operation
      Exclusive two position bias level adjustment
      Balanced inputs with discrete circuits and XLR connectors
      Vampire Direct gold-plated OFC RCA input
      Dual heavy-duty 24k gold-plated 5-way speaker binding posts
      Direct Coupled - no capacitors or inductors in signal path
      Complementary MOSFET driver stage and JFET input stage
      18 beta-matched 15 amp, 60 MHz bipolar output transistors
      1.9 kVA encapsulated toroid power transformer
      Independent power supplies for input, driver and output stages
      18,000 μF filters for driver stage
      132,000 µF Nichicon Gold Tune filters for output stage
      DC Servo and relay protection circuits
      REL and Nichicon Muse capacitors
      Harris hyper-fast soft recovery diodes for all bridge rectifiers
      Auto turn-on by 12v trigger or audio signal trigger
      Ground lift switch , adjustable turn-on delay
      4u Chassis with rear carry handles, rack mounting kit included
      Premium detachable AWG 12 power cord with silver solder
      THX Ultra2 certified
      Continuous power output, 20Hz - 20 kHz:
      400 watts RMS x 1, 8 Ω
      800 watts RMS x 1, 4 Ω
      1200 watts RMS x 1, 2 Ω Class A power output, 20Hz - 20 kHz:
      25 watts, bias set to high, 8 Ω
      10 watts, bias set to low, 8 Ω Current capacity:
      135 amperes peak Power bandwidth:
      2 Hz - 120 kHz, +0/-3 dB at 1 watt Total harmonic distortion:
      < 0.15 % at full power IM distortion: balanced 16 V rms
      < 0.03 % Slew rate:
      > 130 V/µsecond Dynamic headroom:
      > 1.8 dB Input sensitivity:
      1 V for 28.28 V, THX Reference Level Input impedance:
      100 k Ω S/N ratio:
      >120 dB, IHF A-weighted, bias set to high
      >122 dB, IHF A-weighted, bias set to low Damping factor:
      > 1200 at 20 Hz Power Requirement :
      250 watts idle 1280 watts full power into 4 Ω DC trigger output capacity :
      +12 Vdc, 150 mA Dimensions:
      17-1/2" w x 7-5/8" h x 20" d, 7" h without feet Net weight: 64 lb.
      Stereophile: https://www.stereophile.com/solidpoweramps/774/index.html
      Home Theater Review: https://hometheaterreview.com/parasound-halo-jc-1-monaural-amplifier-reviewed/
      Enjoy the Music: http://www.enjoythemusic.com/superioraudio/equipment/1103/parasoundjc1.htm


    • By Aussieamps
      Item: Holton Audio One-Zero-Zero Mini Supreme
      Location: Launceston, TAS
      Price: $2800.00 Includes Shipping Within Australia
      Item Condition: Brand New
      Reason for selling: On Sale!
      Payment Method: Pickup - Cash, Credit Card, Direct Deposit
      Extra Info:
      Normal Price is $3200.00
      PM Me for details or email me at info@holtonprecisionaudio.com


    • By Goatboy
      Item: Exposure 3010 Stereo Power Amplifier
      Location:  Blue Mountains, NSW
      Price: $680
      Item Condition: Very good
      Reason for selling: NLR
      Payment Method: Pickup / Post - Cash, Paypal

      I bought this amp off the forums in 2017, and it has mainly done HT duties as well as spinning 10 hours or so of vinyl each week. The amp has performed flawlessly and presents as warm and emotive, ie. the Exposure house sound. 
      The amp is rated at 100w / channel into 8 Ohms, and has the capability to run as a mono amp, as well as the option to biwire. Note: the amp only takes banana plugs. 
      Cosmetically, there are minor blemishes and some light scratches on the top of the unit.
      I have the original box, so happy to post.
      Power Output (Stereo): 100 Watts per channel at 1KHz into 8 Ohms
      Power output (bridged mono): 110 Watts at 1KHz into 8 Ohms
      Input Impedance: 18K ohms
      Frequency Response: 20Hz - 20 KHz ±0.5dB
      Total Harmonic Distortion: <0.015% at rated output ref 1 KHz
      Signal to noise: >100 dB ref rated output
      Channel Separation: >60dB, 20Hz - 20KHz
      Mains Supply: 110/120V or 220/240V, 50/60Hz (factory set)
      Power Consumption: <350VA, 8 ohm load both channels driven
      Dimensions (H x W x D): 115mmx440mmx300mm
      Net Weight (unpacked): 11kg
      Gross Weight (packed): 13kg

  • Create New...