Genz-Benz provalve 100 オーナーマニュアル

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1.  Never, never operate this or any other tube amplifier without a speaker 

connected to it!  An open or “no load” condition on output transformers 

can lead to internal damage. 

2.  Never use shielded speaker cables.  Use only non-shielded, 18 gauge 

or lager speaker cables. 

3.  Use speakers capable of at least 80 watts RMS (although this amp is 

rated at 50 watts per channel, typical overdrive conditions require 

higher wattage speakers).  MANUFACTURER IS NOT RESPONSIBLE 

FOR ANY SPEAKER FAILURE WHILE USING THIS EQUIPMENT. 

4.  For maximum output volume, use proper impedance.  A single 8 ohm 

speaker or cabinet should be plugged into the 8 ohm jack.  If you use 

two 8 ohm cabinets on a channel, plug each of them into a 4 ohm jack 

(two 8 ohm speakers paralleled equal 4 ohms).  Of course, a single 4 

ohm load should be plugged into one of the 4 ohm jacks.  A 16 ohm 

speaker should be plugged into the 8 ohm jack.  Mismatched speaker 

loads will generally  not damage either the amp or your speakers, but 

will affect maximum output power and acoustic volume. 

5.  It is not possible to power bridge this amplifier.  Neither is an input 

bridging switch provided.  This was done to ensure that the potential of 

one channel being operated without a speaker load would be 

eliminated.  For mono (200 watts with two speaker cabinets) it is 

necessary to purchase a “Y” input converter cord.  Be sure to have a 

speaker plugged into each channel. 

6.  Provide adequate ventilation.  Although a cooling fan for the power 

tubes is provided, take care to allow as much air flow as possible.