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MIG-50 

50W All Tube Guitar Amplifier 

 
Congratulations on your purchase of the Electro-Harmonix 

MIG-50

, an all tube, two 

channel,  50W  guitar  amplifier  head.  The  EHX  MIG-50  is  a  faithful  reissue  of  the 
Sovtek  MIG-50  with  modern  enhancements  to  both  the  electronics  and  mechnical 
design.  The  MIG-50  comes  installed  with  three  12AX7  preamp  tubes  and  two  5881 
power tubes. 

 
 

IMPORTANT SAFETY INSTRUCTIONS 

 

 

Read these instructions. 

 

Keep these instructions. 

 

Heed all warnings. 

 

Follow all instructions. 

 

Clean only with a dry cloth. 

 

Do not block any ventilation openings. 

 

Do not install near any heat sources such as radiators, heat registers, stoves, or 
other apparatus (including amplifiers) that produce heat. 

 

Do not defeat the safety purpose of the polarized or grounding-type plug. A 
polarized plug has two blades with one wider than the other. A grounding-type 
plug has two blades and a third grounding prong. The wide blade or the third 
prong are provided for your safety. If the provided plug does not fit into your 
outlet consult an electrician for replacement of the obsolete outlet. 

 

Protect the power cord from being walked on or pinched. 

 

Unplug this amplifier during lightning storms or when unused for long periods of 
time. 

 

WARNING

: To reduce the risk of fire or electric shock, do not expose this 

apparatus to rain or moisture. 

 

Do not expose this apparatus to dripping or splashing and ensure that no object 
filled with liquids is placed on the equipment. 

 

Maintain at least six inches of unobstructed air space behind the unit to allow for 
proper ventilation and cooling. Air must be capable of freely moving around the 
amplifier. 

 

This amplifier is capable of producing very high sound pressure levels which may 
cause temporary or permanent hearing damage. Use care when adjusting volume 
levels during use.  

 

Do not turn the amplifier on without a loudspeaker. 

 

Refer all servicing and maintenance to qualified service personnel including 
replacement of fuses and vacuum tubes. Changes and modifications not expressly 
approved by EHX can void the warranty. 

 

DO NOT attempt to remove the amplifier chassis. There are no serviceable parts. 

 

DO NOT use this apparatus near water. 

 

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, the apparatus has been exposed to rain or moisture, 
does not operate normally, or has been dropped. 

 

The ventilation should not be impeded by covering the ventilation openings with 
items, such as newspapers, tablecloths, curtains, etc. 

 

No naked flame sources, such as lighted candles, should be placed on the 
apparatus. 

 

Apparatus is not for use in tropical climates. 

 

Only use attachments/accessories specified by the manufacturer. 

 

The appliance coupler shall remain readily operable. 

 

 

 

The lightning flash with arrowhead symbol within an equilateral triangle, is intended to alert the 

user to the presence of uninsulated “dangerous voltage” within the product’s enclosure that 

may be of sufficient magnitude to constitute a risk of electric shock to persons. 

 

The exclamation point within an equilateral triangle is intended to alert the user to the presence 

of important operation and maintenance (servicing) instructions in the literature accompanying 

the product. 

 
 
GETTING STARTED 
 

BEFORE PLUGGING POWER INTO YOUR MIG-50 AMP MAKE SURE: 
 

1.

 

Both  the  POWER  and  STANDBY  toggle  switches  are  off,  set  to  their  DOWN 
position.  

 
2.

 

The  AC  voltage  marked  on  the  rear  panel  matches  the  wall  voltage  for  your 
region or the AC voltage powering your amp. 

 
3.

 

The LOUDSPEAKERS output on the rear panel should be connected via a properly 
rated  speaker  cable  to  a  speaker  cabinet  with  the  correct  impedance  (a  16Ω 
cabinet to the 16Ω jack or an 8Ω cabinet to the 8Ω jack, etc.). 

WARNING:

  Only 

connect one speaker output at a time! Running the amp into a speaker cabinet 
with mismatched impedances or with no cabinet at all could severely damage the 
MIG-50 and void your warranty. Be sure to select a cabinet that can handle the 
full rated 

50W

RMS

 power rating for your amp. 

 

Summary of Contents for MIG-50

Page 1: ... the provided plug does not fit into your outlet consult an electrician for replacement of the obsolete outlet Protect the power cord from being walked on or pinched Unplug this amplifier during lightning storms or when unused for long periods of time WARNING To reduce the risk of fire or electric shock do not expose this apparatus to rain or moisture Do not expose this apparatus to dripping or sp...

Page 2: ...osure that may be of sufficient magnitude to constitute a risk of electric shock to persons The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operation and maintenance servicing instructions in the literature accompanying the product GETTING STARTED BEFORE PLUGGING POWER INTO YOUR MIG 50 AMP MAKE SURE 1 Both the POWER and STANDBY toggle...

Page 3: ...oudness of channel I the normal channel VOL II Knob Controls the overall loudness of channel II the bright channel TONE Knobs TREBLE MIDDLE BASS and PRESENCE controls are used to alter the amplifier s frequency response Adjust to taste and experiment with different settings Lamp Lights when the POWER switch is on Replacement part Dial Lamp 47 T 3 6 3V 0 15A bayonet base REAR PANEL AC INLET Plug th...

Page 4: ...n case it falls HOW TO ADJUST POWER TUBE BIAS In order to adjust the bias of your tubes you will first need a digital multimeter capable of reading DC millivolts and a small flathead screwdriver If you are uncomfortable with using these types of tools or do not understand what power tube bias is please refer to a professional technician We also encourage you to research the subject yourself as the...

Page 5: ... the factory the power tubes were biased to around the middle setting of 62mV WARNING Setting the bias higher than 70mV may destroy your tubes and your amp and will void your warranty 4 Allow the amp to warm up for at least 5 10 minutes and readjust the bias to the desired setting 5 Plug an instrument in and play through the MIG 50 Adjust the bias to taste if necessary ...

Page 6: ...at info ehx com or 1 718 937 8300 USA and Canadian customers please obtain a Return Authorization Number RA from EHX Customer Service before returning your product Include with your returned unit a written description of the problem as well as your name address telephone number e mail address RA and a copy of your receipt clearly showing the purchase date United States Canada Europe EHX CUSTOMER S...

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