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Quicksilver Audio KT Mono Amplifier 

Operating Instructions 

 

Thank you for purchasing the Quicksilver Audio KT Mono Amplifiers.  

 

These amplifiers have been engineered to have a very wide band width, extremely low distortion, 
and superior dynamic range.  
 
The output transformer used in this amplifier is based on the best designs of the past but uses 
superior new materials to achieve a very high level of performance. The high frequency 
characteristics of this transformer are very stable. Any KT series output tubes may be used 
without the need for circuit changes or compensation adjustments. 
 
This is an all-tube design and used no circuit boards or transistors. 
 

PLACEMENT 

The KT Mono Amplifiers should have at least 6 inches of ventilation space on either side and at 
least 6 inches oabove them. If this is not possible, then use a fan for colling. 
 

SPEAKER CONNECTION 

Five-way binding posts are used for speaker connection. For a better sonic performance, we 
recommend using the screw-down part of the post rather than banana plugs to connect your 
speaker wire. Make sure the ends of the speaker leads do not touch each other. The rating on the 
back of your speaker system will determine whether you use the 4 or 8 ohm tap for the positive 
lead. Connect the negative or ground to the black post. 
 
There is a diagram on the bottom of the amp that identifies the three posts labeled 4 ohm, C, 8 
ohm: 
 
 
Use the 4 ohm tap for speakers from 4 to 8 ohms impedance or the 8 ohm tap for speakers from 8 
to 16 ohms. 
 

4 AMP SLO-BLO FUSE 

Standard fuse value must not be exceeded. If a fuse blows, replace and check out tube bias. If 
there is a large change, then an output tube is probably damaged. If the bias has not changed, 
then the cause of the fuse blowing may be due to other problems, such as poor system grounding, 
unstable preamp, shorted speaker, etc. Interchanging the amps between channels will help 
localize the problem to either the system or the amplifier. 
 

TUBES 

The input tubes in this amplifier were chosen for their specific performance characteristics. 
These tubes should last between one and two thousand hours. We can only guarantee the 
performance of this unit when used with input tubes supplied by Quicksilver Audio. 
 

4      C     8 

Input 

100K 

Summary of Contents for KT Series

Page 1: ...an banana plugs to connect your speaker wire Make sure the ends of the speaker leads do not touch each other The rating on the back of your speaker system will determine whether you use the 4 or 8 ohm tap for the positive lead Connect the negative or ground to the black post There is a diagram on the bottom of the amp that identifies the three posts labeled 4 ohm C 8 ohm Use the 4 ohm tap for spea...

Page 2: ...transformer To adjust the bias you will a slot head screwdriver and a multimeter that reads millivolts Adjust by turning clockwise to increase bias counterclockwise to decrease bias Set the meter to read millivolts not milliamperes Insert the black and red probes from your meter into black and red pin jacks on the amp The millivolt reading on the meter is actually the bias current in ma through th...

Page 3: ...T88 KT90 KT120 or KT150 outputs Dimensions 5 high x 14 deep x 9 1 8 wide Finish Black chassis Chrome transformer covers Weight 38 lbs 44 lbs shipping Warranty 3 years parts and labor 90 days tubes POWER SUPPLY CAPACITOR INPUT TUBE 12AX7 DRIVER TUBE 12BH7 OUTPUT TUBES INSERT METER PROBES TO CHECK BIAS OUTPUT TRANSFORMER POWER TRANSFORMER INPUT CONNECTOR 100k SPEAKER TERMINALS POWER CORD 4 AMP FUSE ...

Page 4: ...free of charge as long as the failure was not caused by misuse accident or negligence Shipping to the factory is not included Retain at least one packing carton in case a unit needs to be returned for service Quicksilver Audio 7475 Murray Drive Suite 17 Stockton CA 95210 209 957 6640 fax 209 957 6641 info quicksilveraudio com www quicksilveraudio com ...

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