Built in Vacuum Valves
Russian Aviation grade:

6H2N-EB *6 and  6U4N-EB *4

Filament voltage: 6.3V

Input power supply: 200-250VAC Or 100-125VAC
　

Burn in time
　		 The unit had 100 hours in factory.
Another 100 hours burn in is recommend.

Warm time
　		 20 Minutes

Power on time
　		 Advice less than 8 hours every day

S/N Ratio
　		 Vacuum HE1 XLR: >96DB  (2V input，2VRMS output , Unweighted )

Output impedance
　		 <300 ohm
Frequency Response Single-ended (<-3DB) Balanced (<-3DB)
   
THD Single-ended (<0.05%) Balanced (<0.02%)
   
Single-ended (<0.05%) Balanced (<0.02%)
   
Input Sensitivity


1V RMS output：280MV
　

Gain
　

11DB
Power Requirement
 Version 1: 100-120V  AC 50/60 Hz

Version 2:  220-240V  AC 50/60 Hz
　
Power Consumption
90W (Vacuum HE1 XLR)
　
Package Weight
Approximately 22KG
　

Dimensions
　		 W430 X L445 X H125 (MM,with feet, full aluminum )
Accessories
AC power cord     X1

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