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1. Manley Labs
   MMSSLCHP
   母版立体声Variable Mu可变增益电子管压限器
   
   Variable Mu®限幅器压缩器的母版版本，它具有已卡位及可记录的1/2dB步进制作功能，使用1%金属薄膜阻抗在密封的金触点Grayhill开关。
   开关的参数如下：
   ● 输入: -4到+4，以2dB步进● 输出: -11到0，以1/2dB步进 (24卡位)● 阈值: -11到+1，以1/2dB步进 (24卡拉)● 启始: 11位● 释放: 5位

Manley Variable Mu 是一个立体声的，10dB真空管可编程限幅/压缩器，是基于Fairchild类型的。Variable Mu这个名词是来自于经典的Fairchild 670中所采用的一种技术，是指遥控切断或重现设置真空管的偏重电压以实现压缩效果。

功能特性：
●变压器耦合的平衡式XLR模拟输入输出端口
● 所有真空管电路都有独立校准的B+供电和灯丝供电
●启动时间从25-70ms可变，启动门限连续可调
●硬件连线的旁路开关以及立体声联结开关
●全尺寸的VU表
●可以多机连接用于环绕声制作的使用
●高度2U，可机架安装

• MANLEY input & output transformers with nickel laminations in mu-metal cases with flat frequency response from 20Hz-25KHz
• BALANCED INPUTS & OUTPUTS (600 Ohms)
• Fully differential ALL-TUBE circuitry using one each 5670, 5751 (or 12AX7), 7044 (or 5687), & 12AL5 per channel
• Independently regulated B+ and Heater supplies
• Hard-wire BYPASS switch
• Stepped switch INPUT attenuator as of 10/2011. (older units use Silent dual-ganged potentiometer)
• RECOVERY 5 steps: 0.2s, 0.4s, 0.6s, 4sec., 8sec.
• Variable ATTACK: 25msec-70msec
• Continuously variable THRESHOLD
• LIMIT (4:1 to 20:1) or COMPRESS (1.5 to 1)
• HP SC: High Pass Side Chain Filter -3dB @ 100Hz
• Large ILLUMINATED Sifam METERS (older units before serial number MSLC61642 shipped before 12/2003 use: 26V 1.2W FESTOON LAMPS; Manley's Part Number: VAR016B) Order spare bulbs using our parts order form. (newest units after serial number MSLC61642 shipped after 12/2003 use white LED lighting)
• STEREO LINK SWITCH
• Several units can be linked for Surround (custom order )
• Maximum gain: 35dB
• Max. output: +30dBu (26Vrms) 26dB Headroom
• <0.1% THD @ 1KHz Noise floor: -85dB typical
• Power Consumption (120/240VAC): 80 watts
• Unit is factory set for 100V, 120V or 220-240VAC operation for original destination country's mains voltage.
• Operating Mains Voltage changeable with power transformer changeover switch and fuse value change.
• Mains Fuse Value for 100~120VAC operation: replace with 1.25A as of 10/2011
• Mains Fuse Value for 220~240VAC operation: replace with 0.6A (600mA) as of 10/2011
• Mains Fuse Type: MDA or MDL SLO-BLO Time delay 1 1/4" x 1/4"
• Mains Voltage Frequency: 50~60Hz
• Dimensions: 19” x 3 1/2” x 10” (chassis occupies 2u) Power transformer protrudes 3.5" out the back of the chassis.
• Shipping Weight: 23 lbs.
• Unit Weight: 14 lbs