Shep
Well-known member
Hey here is a little right up on the mk IV amp!!
MkIV A 1991-1994
serial 0000-around the 6XXX's
-two mono FX loop's (normal And Switchable) The four plugs form a box shape.
-12at7 in V4 ( the reverb tube slot)
-No reverb foot switch on the back.
-older style tolex and LED's.
-Smaller power transformer than the B.
Voiced alittle brighter than the later models which seem to give them a closer to C+ sound to the newer models ( in no way am i trying to start hype)
Mk IV B 1994 to 2008
6000's onwards
-has a 3 plug stereo FX loop replacing the two mono ones..these plugs are in more of a line
-12at7 is replaced with a 12ax7 for V4
-reverb foot switch jack added on back of chasis.
-satellite send function..
-slightly bigger power transformer than the A.
Also
-The B was voice to have a darker lead tone and more gain on the rhy2.but i think the difference is still Very Little.
-Reverb switch on the A could be made by adding a RCA Y splitter to the input of the reverb tank with one side going to the reverb tank and the other side to a ground to tip short pedal. this shorts the reverb tank to ground effectively creating a on/off switch.WORKS GREAT!
Tubes- Power mesa types that work great are the Str 420 and of course the 415. But other non mesa brands that sound great and last ages and don't cost $400 for 4 are JJ 6L6 and =C= are Great! Pre amp i would be going in V1 and V3 a 1950's/1960's (rca mullard or FRT) these sound amazing! the bass is huge! and you can really push it on your amp but it NEVER sounds tubby at all.cheaper nice sounding tubes are JAN, TUNG Sol, JJ and EH.
Speakers,
Everyone is pretty same in this department you ether like the traditional 4x12 with vintage 30's OR a 1x12 theile with a EV200 watt speaker. There are others which sound good too like C90's and other black shadow model's but i reckon these sound the best!
MkIV A 1991-1994
serial 0000-around the 6XXX's
-two mono FX loop's (normal And Switchable) The four plugs form a box shape.
-12at7 in V4 ( the reverb tube slot)
-No reverb foot switch on the back.
-older style tolex and LED's.
-Smaller power transformer than the B.
Voiced alittle brighter than the later models which seem to give them a closer to C+ sound to the newer models ( in no way am i trying to start hype)
Mk IV B 1994 to 2008
6000's onwards
-has a 3 plug stereo FX loop replacing the two mono ones..these plugs are in more of a line
-12at7 is replaced with a 12ax7 for V4
-reverb foot switch jack added on back of chasis.
-satellite send function..
-slightly bigger power transformer than the A.
Also
-The B was voice to have a darker lead tone and more gain on the rhy2.but i think the difference is still Very Little.
-Reverb switch on the A could be made by adding a RCA Y splitter to the input of the reverb tank with one side going to the reverb tank and the other side to a ground to tip short pedal. this shorts the reverb tank to ground effectively creating a on/off switch.WORKS GREAT!
Tubes- Power mesa types that work great are the Str 420 and of course the 415. But other non mesa brands that sound great and last ages and don't cost $400 for 4 are JJ 6L6 and =C= are Great! Pre amp i would be going in V1 and V3 a 1950's/1960's (rca mullard or FRT) these sound amazing! the bass is huge! and you can really push it on your amp but it NEVER sounds tubby at all.cheaper nice sounding tubes are JAN, TUNG Sol, JJ and EH.
Speakers,
Everyone is pretty same in this department you ether like the traditional 4x12 with vintage 30's OR a 1x12 theile with a EV200 watt speaker. There are others which sound good too like C90's and other black shadow model's but i reckon these sound the best!