POWER AMPLIFIER CS-660P

One of Mr.Hyodo's favourite KT66 based power amplifiers is the QUAD II, (The QUAD II has recently been re-launched due to the demand from audiophiles)

M Hyodo has now decided to design a new power amplifier using the same KT66 tube but incorporating high-end audio grade components, far superior to those used in the original QUAD design.

CS-660P picture No.2

TWO CHOICES OF OUTPUT TUBES: KT-66 AND OPTIONAL 6CA7 (EL34)

By switching two selectors inside of the cabinet, you can use either KT-66 or 6CA7 (EL34) KT-66 or 6CA7 (EL34) KT-66 or 6CA7(EL34)KT-66 or 6CA7 (EL34), a LED indicator at the foot of each tube will change its colour and show you which tube is in use. You also can use several other tubes of different sound characterisic. (Refer to the Tube List)

STEREO/MONO SELECTOR SWITCH

You can use CS-660P as a monaural power amplifier by changing the selector switch giving an 80W output power.(40W x 2 when used as a stereo power amp.)

CS-660P picture No.3

A WIDE RANGE OF SPEAKER APPLICATION

Multi output impedance selector: 4/6/8/16 ohms.

FLAT AND WIDE FREQUENCY RESPONSE

A wide frequency response from 10Hz to 100KHz (-0dB) caters for digital audio formats such as SACD/HDCD.

OTHER FEATURES

CS-660P SPECIFICATIONS

TUBES COMPLIMENT (4) KT-66, (EL34/6CA7 - Option)
(4) 6CS7
(1) 6CJ3
OUTPUT POWER
(Stereo/Mono Selector Switch)
Stereo 40W x 2 (KT-66) at 1KHz.
Monaural 80W X 1 (KT-66) at 1KHz.
FREQUENCY RESPONSE 10Hz - 180KHz. (-3dB)
DISTORTION 0.7%(10W)
INPUT SENSITIVITY 1.5V at 40W
INPUT IMPEDANCE 100K Ohms.
OUTPUT IMPEDANCE 4/6/8/16 Ohms (Selectable)
POWER CONSUMPTION 230W
WEIGHT 17.0 Kgs.
DIMENSIONS 415 (W) X 480 (H) X 320 (D) mm
ATTACHMENT Detachable AC Power Cable x 1
CS-660P picture No.4

TUBE COMPATIBILITY LIST

TUBES SELECTOR SWITCHES ON REAR PANEL
CATHODE RESISTOR PLATE VOLTAGE
COLOUR OF LED INDICATORS RED GREEN RED GREEN
POSITION OF SELECTOR SWITCH UP DOWN UP DOWN
KT66 (Standard) O X X O
EL34/6CA7 (Option) X O X O
OTHER APPLICABLE TUBES
KT77 X O X O
6CA7 X O X O
KT88 O X O ( * )
KT100 O X O ( * )
6L6GC/5881 O X O ( * )
6550A O X O ( * )
350B O X O ( * )
KT90 O X O ( * )
5881 O X O ( * )
DO NOT USE
6L6(METAL TUBE) (A RISK OF ELECTRIC SHOCK)
6L6G
6L6GA
6L6GB (NOT APPLICABLE)
7027(A)
6550

(*) … ALSO APPLICABLE