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.
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)
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.)
Multi output impedance selector: 4/6/8/16 ohms.
A wide frequency response from 10Hz to 100KHz (-0dB) caters for digital audio formats such as SACD/HDCD.
| 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 | |
| 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