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1

 

Input Jack: Guitar cable goes here (the other end should 
probably be in the guitar) 

2

 

CLEAN Volume: Adjust the amount of volume that the 

amplifier produces in the CLEAN Channel.  The CLEAN 

channel is designed for maximum headroom, so don’t be 

afraid to turn it up! 

3

 

BASS: Part of the CLEAN channel 3-band EQ for adjusting low 

frequencies 

4

 

MID: Part of the CLEAN channel  3-band EQ for adjusting 
middle frequencies 

5

 

TREBLE: Part of the CLEAN channel  3-band EQ for adjusting 
high frequencies 

6

 

CRUNCH Gain: Adjust the amount of gain (distortion) that 

the amplifier produces in the CRUNCH Channel.  Keep it low 

for crystal clear cleans, or dial it up for some tube overdrive. 

7

 

BASS: Part of the CRUNCH channel 3-band EQ for adjusting 
the low frequencies. 

8

 

MID: Part of the CRUNCH channel 3-band EQ for adjusting 

the middle frequencies. 

9

 

TREBLE: Part of the CRUNCH channel 3-band EQ for adjusting 

the high frequencies. 

10

 

CRUNCH Master Volume: Lets you adjust how loud the 

CRUNCH channel’s output will be. 

11

 

REVERB: Adjusts the “depth” of the built in reverb. 

12

 

PRESENCE: Adds an overall brightness, which can be handy 

when trying to cut through in a ‘dead’ room. 

 

13

 

STANDBY switch: Used in conjunction with the main POWER 

switch (item 12).  Use the STANDBY to “warm up” your amp’s 

tubes before turning on the PWER switch.  Always put the 

amp in STANDBY before turning the main power switch on or 

off! 

14

 

POWER switch: This is the main power switch for the entire 

amp.  Be sure that your amp is switched off AND unplugged 

before moving it! 

15

 

Power Indicator Light: The pretty light glows blue when your 

amp is on. 

 
TUBE AMP BASICS

 

 

1.

 

Can you really die from messing around with the guts of 
tube amp? 

Yes, you can.  Tube amps carry significant voltage, even 
when turned off.  DO NOT mess with the insides of a tube 
amp unless you are a trained tech. 

 

2.

 

OK, question 1 scared me.  Can I safely change my own 
tubes? 

Yes, you can.  The dangerous voltages are only a problem if 
you start messing with wires and transformers.  It is perfectly 
safe to change your own tubes. 

 

3.

 

How often should I change tubes? 

There is no set timeline for changing tubes.  If you play ever 
day, a good rule of thumb is to replace your power tubes 
once a year and your preamp tubes every other year.  
However, it is entirely possible for tubes, particularly preamp 
tubes, to last decades. 
 
Here are some signs that you need to change your tubes: 
 

 

Excessive noise like squealing, humming, or hiss 

Summary of Contents for JCA5212RC

Page 1: ...ms If the product needs to be modified or adapted in order to comply with technical or safety standards on a national or local level in any country which is not the country for which the product was n...

Page 2: ...et City 2 Warranty Jet City Amplification warrants the mechanical and electronic components of this product to be free of defects in material and workmanship for a period of one 1 year from the origin...

Page 3: ...openings Install in accordance with the manufacturer s instructions 6 Do not install near heat sources such as radiators heat registers stoves or other apparatus that produce heat 7 Protect the power...

Page 4: ...metimes called load 3 OK how does that relate to my JCA5212RC Your amp has outputs on the back marked 16 ohm and 8 ohm You need to pick the correct output for your speaker configuration To be specific...

Page 5: ...as the speaker cabinet s resistance to an amp s power The higher the cabinet s impedance the more the amp has to work to push power through it The goal in any amp cabinet configuration is the 5 The Je...

Page 6: ...h can be handy when trying to cut through in a dead room 7 13 STANDBY switch Used in conjunction with the main POWER switch item 12 Use the STANDBY to warm up your amp s tubes before turning on the PW...

Page 7: ...uct is used Damages defects caused by force majeure or any other condition that is beyond the control of Jet City Amplification Any repair or opening of the unit by unauthorized personnel user include...

Page 8: ...n hearing loss Ear plug protectors in the ear canals or over the ears must be worn when operating this amplification system in order to prevent a permanent hearing loss if exposure is in excess of the...

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