Fuchs Audio Technology Blackjack 21-II Operation Manual Download Page 10

various other aftermarket devices for this purpose. Depending on the outboard unit you 

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. 

 

 

6.

 

BIASING THE AMPLIFIER POWER TUBES, WARNINGS AND TECHNICAL INFO 

 

The circuit board is shown in Section 4 of the manual should be viewed as having 

the chassis sitting on its transformers, and front panel facing the user.  
 

!!! WARNING – ELECTRICAL SHOCK HAZARD!!! 

 

T

HERE ARE EXPOSED POTENTIALLY 

DEADLY

 HIGH

-

VOLTAGES IN THIS AMPLIFIER

,

 

EVEN WITH THE AMPLIFIER SHUT

-

OFF

!

 

 
If you are not familiar with servicing tube amplifiers and/or high voltages, 

do not 

attempt 

to remove the chassis from its cabinet or to attempt to service this 

amplifier. 

Do not attempt to service, repair or conduct tube biasing on your 

amplifier unless you are qualified to do so. 

Refer servicing to the factory or to 

someone with experience servicing these types of amplifiers. 

 

DISCLAIMER: 

Fuchs Audio Technology, LLC®, its subsidiaries, affiliates and/or 

agents shall have no responsibility for, nor shall they be held liable for 

any

 harm 

of any kind to any person/s or property (including damage to this amplifier) as a 

result of improper and/or 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: ...se 50 and Wild Card 100 head combo Fuchs Audio Technology 407 Getty Ave Clifton NJ 07011 USA 973 772 4420 fax 973 772 4460 Website www fuchsaudiotechnology com Email info fuchsaudiotechnology com 2000...

Page 2: ...dous 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 by your full understanding of thec...

Page 3: ...powering up your amp 3 Diagrams FRONT REAR panels Tube bias diagram 4 Front Panel Controls Inputs Functions 5 Rear Panel Controls Inputs Outputs 6 Technical Information Service Information Tube Biasi...

Page 4: ...cord is standard And through Fuchs single point grounding the amp is quiet and free of hum at all operating levels A single instrument input and 3 speaker outputs for 4 8 16 ohms are provided An effec...

Page 5: ...l 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 IN...

Page 6: ...3 DIAGRAMS OF FRONT REAR PANELS TUBE BIAS DIAGRAM Front Panel Rear Panel Tube Bias Diagram...

Page 7: ...AT7 Phase inverter driver tube 4 FRONT PANEL CONTROLS INPUTS THEIR FUNCTIONS Input Jack Input jack is a 1 4 phone plug designed for 1 Meg impedance guitar level signal This input will readily accept p...

Page 8: ...the amount of reverb return to the amp Reverb Decay The Reverb decay adjusts the time it takes for the reverb signal to decay Counterclockwise is the shortest decay and turning all the way clockwise...

Page 9: ...being used but being warmed up place amp into standby mode Effects Loop Patch jack This is a stereo The tip is the return to the power amp The ring is the send from the preamp This may be used with an...

Page 10: ...ponsibility for nor shall they be held liable for any harm of any kind to any person s or property including damage to this amplifier as a result of improper and or unauthorized service repair or inte...

Page 11: ...h a polarized plug one blade wider than the other This is a safety feature If you are unable to insert the plug into the outlet contact an electrician to replace your obsolete outlet Do not defeat the...

Page 12: ...ervicing to qualified personnel only Fuchs amplifiers and loudspeaker systems are capable of producing very high sound pressure levels which may cause temporary or permanent hearing damage Use care wh...

Page 13: ...the original purchaser This excludes tubes which are covered for 90 days by Fuchs and whatever period the manufacturer of the tube provides This does not apply to Fuchs amplifiers that have been tampe...

Page 14: ...his form so we may register you for future warranty repairs or future upgrades should they become available Purchasers Name Address City State Zip Country Phone Number E Mail address Model Serial Numb...

Page 15: ...72 4420 fax 973 772 4460 Website www fuchsaudiotechnology comEmail info fuchsaudiotechnology com All Fuchs Products are Distributed in the EU through Audiowerk Distribution andLogistics AUDIOWERK e Kf...

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