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13

12

8. MP3 / Line In

This is a stereo mini jack input. Connect the output of your audio device here and 

adjust the player’s volume to match that of your guitar to enable you to play along.

NOTE:

 This connection is stereo, and will remain stereo from the Emulated Output 

Stereo Jack Socket (6). All others outputs will mix the incoming stereo signal and 

output a mono version.

9. Effects Loop Level

The Effects Loop Level switch sets the effects loop to 4dBV/-10dBV, which 

enables you to use it with either professional equipment (+4dBV setting), or with 

guitar level effects such as effects pedals (-10dBV setting).

10. Effects Loop Return

Connect the (mono) output of an external effects unit here.

11. Effects Loop Send 

Connect the (mono) input of an external effects unit here.

12. Footswitch

A 2-way footswitch can be connected here. The footswitch will enable the selection 

of the Clean and Overdrive channels, and the two voices on each Channel.

NOTE:

 Using a footswitch will disable the front panel channel and voice switches. 

Therefore, full control via the footswitch is granted irrespective of how the amplifier 

is set.

EXTERNAL SWITCHING: 

This can also be used by people who wish to control 

the main features of the amp using an external switching device that connects via 

the TRS connection of the socket. 
The following external conditions will switch the channels and voices as follows:

TIP 

RING 

CHANNEL 

VOICE

Closed 

Closed 

Clean 

Voice 1

Closed 

Open 

Clean 

Voice 2

Open 

Closed 

Overdrive 

Voice 1

Open 

Open 

Overdrive 

Voice 2

English

English

13. Emulated Output USB Socket 

This B-type USB socket is for connection to a computer via a suitable lead (not 

supplied). The output will be a stereo, fully processed guitar signal complete with 

speaker cabinet emulation and stereo reverb.
Standard audio drivers are used to connect the amplifier to a PC, Mac or other 

applicable recording device. No specific drivers are required.
For a guide on low latency USB recording visit:
www.blackstaramps.com/usbrecording

NOTE:

 Always connect the amplifier via a main USB port, often found on the rear of 

the computer. The amplifier will appear as an audio capture device within recording 

software.

14. Kensington Lock

Also known as a Kensington Security Slot or K-Slot this is a specifically sized hole 

for  connecting  a  compatible  Kensington  Lock  to  secure  the  amplifier  to  a  fixed 

point.  For more information please refer to www.kensington.com 

Summary of Contents for JJN-20RH MkII

Page 1: ... www blackstaramps com Whilst the information contained herein is correct at the time of publication due to our policy of constant improvement and development Blackstar Amplification Ltd reserves the right to alter specifications without prior notice Designed and Engineered by Blackstar Amplification UK 126404M 1 02 19 JJN 20RH MkII ...

Page 2: ...pparatus 12 Only use attachments accessories specified by the manufacturer 13 Unplug this apparatus during lightning storms or when unused for long periods of time 14 Refer all servicing to qualified service personnel Servicing is required when the apparatus has been damaged in any way such as power supply cord or plug is damaged liquid has been spilled or objects have fallen into the apparatus th...

Page 3: ...e unused for long periods of time Before the unit is switched on the loudspeaker should be connected as described in the handbook using the lead recommended by the manufacturer Always replace damaged fuses with the correct rating and type Never disconnect the protective mains earth connection High loudspeaker levels can cause permanent hearing damage You should therefore avoid the direct vicinity ...

Page 4: ...esponsive chime with looser bottom for the British tone that can be pushed into a midrange overdrive when driven hard The Voice setting can also be selected via footswitch This amplifier also has two voices on the Overdrive Channel providing a broad palette of overdriven tones As with the Clean Channel each of these voices can also be selected by footswitch The Overdrive voices are characterised b...

Page 5: ...ic but hot rodded overdrive with medium power amp damping With the red LED lit the overdrive sound has a more modern voicing that includes a strong mid emphasised pre overdrive boost as well as a looser more aggressive sound due to reduced power amp damping 8 OD Volume This control adjusts the overall volume of the OD Channel Turning it clockwise increases the volume 9 Bass The Bass control adjust...

Page 6: ...cified on the rear panel Never use a fuse of the incorrect value or attempt to bypass it English English 4 Speaker Outputs The output marked 1x16 Ohm is for the connection of a single 16 Ohm extension speaker cabinet The outputs marked 1x8 Ohm or 2x16 Ohm are for the connection of either a single 8 Ohm extension cabinet or two 16 Ohm cabinets 1x16 Ohm output 1x8 Ohm or 2x16 Ohm outputs Internal 16...

Page 7: ...s set EXTERNAL SWITCHING This can also be used by people who wish to control the main features of the amp using an external switching device that connects via the TRS connection of the socket The following external conditions will switch the channels and voices as follows TIP RING CHANNEL VOICE Closed Closed Clean Voice 1 Closed Open Clean Voice 2 Open Closed Overdrive Voice 1 Open Open Overdrive ...

Page 8: ...15 14 Technical Specification JJN 20RH MkII Power RMS 20 Watts Valves 2 x EL84 2 x ECC83 Weight kg 9 6 Dimensions mm 473 x 244 x 222 Footswitch FS 16 included English English ...

Page 9: ...Japanese Japanese JJN 20RH MkII Front Panel JJN 20RH MkII Rear Panel 20 2W 20W INPUT TONE CLEAN VOLUME 10 0 VOICE 10 0 10 0 BLUES POWER SELECT VOICE VOLUME OVERDRIVE GAIN 10 0 10 0 10 0 10 0 10 0 OD EQUALISATION ISF TREBLE MIDDLE BASS LEVEL REVERB 10 0 VOLUME MASTER 10 0 POWER ON ...

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