ConradJohnsonusedConrad Johnson Premier 8A1 pair of ConradJohnson Premier 8A Tube Mono Blocks please look at pictures-- one of the transformers got bent -- unit plays fine but cosmetically one transformer is bent They are part of an...6500.00

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Conrad Johnson Premier 8A [Expired]


no longer for sale

1 pair of ConradJohnson Premier 8A Tube Mono Blocks

please look at pictures-- one of the transformers got bent -- unit plays fine but cosmetically one transformer is bent 

They are part of an estate sale we are handling .. they sound amazing --we are running them with a bair of KEF BLADES in our show room and they sound stunning...Amazing bottom end clean and detailed very big sound stage and amazing imaging !
they are a rare find and a collectors item !

 

see pictures (7-10 due to age and some dings ) 
they were just re-tubed with brand new tung-sol 6550 tubes

 

mods were all done november of 2015

 

they have had extensive mods done $4000 worth by Backert Lab’s, Bob Backert

#1-rebuilt input pc board to new dynamic linearity servo circui in both units

#2-installed dynamic linearity servo inverter circuit in both units

#3- installed RTE-2 power supply with new V-CAPS AND AURICAPS INCLUDING START UP CIRCUIT IN BOTH UNITS

#4-Redesigned output bias regulator in both units

#5- mod filament supply to front tubes

#6- we just installed 16 new tung-sol 6550 in both units

 

The flagship of the conrad-johnson amplifier line for many years, the Premier Eight A-- was a powerful 275 watts per mono-block making it the perfect choice for speaker systems which require tremendous power input and control.

The Premier Eight A  used premium quality component parts throughout. The power supplies, including the main storage reservoir, used only polypropylene and “cjd” polystyrene capacitors as opposed to the traditional deployment of electrolytic capacitors.

The audio circuit consists of three stages. A triode- amplifier using four paralleled sections of two 5751’s amplifies the input signal. That stage is direct-coupled to a cathode coupled phase inverter, each half of which consists of four paralleled sections of two high current twin triodes. The phase inverter circuit provides a balanced, low-impedance drive to the final output stage ­ four pairs of 6550’s. They operate in AB ultra-linear configuration, offering an optimal combination of high-power, low distortion, and low output impedance.

The Premier Eight-A added a noise filter to the bias indicator circuit, upgraded resistors and capacitors in the voltage amplifier and bias power supplies, and improved input wiring. The Premier Eight-XS is a an Eight-A with output stage configured to use EL34s connected for triode operation.

All Premier Eights were supplied with a protective tube cover, especially important for households with small children and pets.

Features:

  • 5-way binding post speaker connectors
  • one pair of inputs
  • two plate fuses
  • power switch

Replacement Tube Set: RTPR8 or RTPR8XS

V1 & V2: 5751 | V3-V6: 6FQ7/6CG7 | V7-V18: 6550

Premier Eight and Premier Eight-A | V7-V18: EL34 Premier Eight-XS

 

Specifications:

  • Power Output ­ 275 watts from 30Hz to 15kHz at no more than 1% THD or IMD into 4 ohms (also available connected for 2, 8 or 16 ohm loads).
  • Power Output (model XS equipped with EL34 output tubes in triode mode) ­ 130 watts from 30Hz to 15kHz at no more than 1% THD or IMD into 4 ohms (also available connected for 2, 8 or 16 ohm loads).
  • Response: 20Hz to 20kHz, +/- .1 dB
  • Input Impedance: 100 kOhms
  • Hum & Noise: 96 dB below rated power

Mechanical:

questforsound 

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