Fuchs Audio Technology Blackjack-21-II Operation Manual Download Page 9

are using, an effects loop device may not be needed. You can try any unit you like, and 

see if the tone and performance is acceptable to you without damage to the unit.  

 

Footswitch Jack:  

This is a stereo ¼” phone plug. The tip is overdrive select, and the ring activates a gain 

boost, which does not disable tone controls, and works on both clean and dirty 

channels.

 

 

 6

   Biasing the amplifier power tubes & other technical info 

 

The  circuit board is shown earlier in the manual with the chassis sitting on its 

transformers, and front panel facing you. There are exposed high-voltages in this 

chassis, even with the amplifier shut-off! If you are not familiar with tube amplifiers 

and/or high voltages, do not attempt to remove the chassis from its cabinet or to 

attempt to service this amplifier. Refer servicing to the factory or to someone with 

experience servicing these types of amplifiers. 

  

DISCLAIMER:

 There are exposed high-voltages within this amplifier. Do not attempt to 

service, repair or conduct tube biasing unless you are qualified to do so. Please contact 

Fuchs Audio beforehand with questions in this regard. Fuchs Audio takes no 

responsibility or shall be held liable for any personal harm caused or damage to this 

amplifier as a result of unauthorized service, repair or internal adjustments 

made to this amplifier. 

 

 

 

FCC COMPLIANCE STATEMENT: This equipment has been tested and 
found to comply with the limits of Part 15 of the FCC Rules. These limits 
are designed to provide reasonable protection against 
harmful interference in a residential installation. This equipment generates, 
uses and can radiate radio frequency energy and, if not installed and used 
in accordance with the instructions, may cause harmful interference to 
radio communications. However, there is no guarantee that interference 
will not occur in a particular installation. If this equipment does cause 
harmful interference to radio or television reception, which can be 
determined by turning the equipment off and on, the user is encouraged to 
try to correct the interference by one or more of the following measures: 
•Reorient or relocate the receiving antenna. •Increase the separation 
between the equipment and receiver. •Connect the equipment into an outlet 
on a circuit different from that to which the receiver is connected. •Consult 
the dealer or an experienced radio/TV technician for help.

 

 

 

 

 

 

Summary of Contents for Blackjack-21-II

Page 1: ...II Lucky 7 II Four Aces heads combo Fuchs Audio Technology 407 Getty Ave Clifton NJ 07015 973 772 4420 fax 973 772 4460 Website www fuchsaudiotechnology com Email info fuchsaudiotechnology com 2000 2...

Page 2: ...tremendous musicality of this new series Please read this manual carefully Although these amps were created to be simple amplifiers to operate they will perform to fullest glory by your full understan...

Page 3: ...fore powering up your amp 3 Diagrams FRONT REAR panels Tube bias diagram 4 Front panel Controls inputs their functions 5 Rear Panel controls inputs outputs 6 Biasing power tubes other technical info 7...

Page 4: ...itry are on the circuit card while the power tubes and transformers are mounted on the chassis A detachable power cord is standard By using single point grounding the amp is quiet and free of hum at a...

Page 5: ...tall instrument cable from guitar into front panel INPUT 5 Be sure both POWER switch front panel is in DOWN 0ff position and standby is in off down position 6 Install power cord to amplifier AC POWER...

Page 6: ...3 Diagrams of FRONT REAR Panels Tube Bias Diagram Front Panel Rear Panel Tube Bias diagram Biasing for various models...

Page 7: ...dals effects input is also inserted to this input in series with your guitar Clean Gain Control The gain control sets the overall gain volume for the amplifier in the clean channel 1 mode Adjust to vo...

Page 8: ...sis and make sure you are supplying the correct AC voltage to the unit Damage from incorrect voltages is not covered by warranty AC power Fuse This fuse protects the amplifier if any malfunction occur...

Page 9: ...questions in this regard Fuchs Audio takes no responsibility or shall be held liable for any personal harm caused or damage to this amplifier as a result of unauthorized service repair or internal ad...

Page 10: ...an to replace your obsolete outlet Do not defeat the safety purpose of this plug Protect the power supply cord from being pinched or abraded This product should only be used with a cart or stand that...

Page 11: ...This does not apply to Fuchs amplifiers that have been tampered with damaged by shipping carriers reverse engineered or modified Your warranty form information must be returned to Fuchs Audio Technol...

Page 12: ...________ Model ___________ Serial Number ___________________________________ Date of Purchase ___________________________________________________ Dealer Name __________________________________________...

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