Mark III simull class head how do i know which version is?

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mxr2000
Mark III
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Mark III simull class head how do i know which version is?

Post by mxr2000 » Sun Jul 27, 2008 12:45 pm

just found a mark III simul class 100 watts sounds great but i would like to know Which version is and how to date it? its a small black head s/n 22999

Psyence88
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Post by Psyence88 » Sun Jul 27, 2008 2:44 pm

It should have a color stripe above the power cord and it's dated right on the chassis.

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mxr2000
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Post by mxr2000 » Sun Jul 27, 2008 6:32 pm

according to this info, mine is blue stripe but i can't find the date of the amp yet

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Mark Fore
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Post by Mark Fore » Sun Jul 27, 2008 7:21 pm

To find the date you will need to open her up and remove the chassis. The date should be written inside like the picture below of my Mark III:

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mesaboogie6L6
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Post by mesaboogie6L6 » Sun Jul 27, 2008 7:45 pm

If you look under the chassis by the first preamp tube (V1) there might be a date, mine is marked 10/90 in red sharpie.
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phyrexia
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Post by phyrexia » Sun Jul 27, 2008 9:37 pm

FYI if it's simul class it's not 100w.
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IXIStreakIXI
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Post by IXIStreakIXI » Sun Jul 27, 2008 11:21 pm

Yes it is. My Simul-class is 60/100.

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Post by MrMarkIII » Mon Jul 28, 2008 1:46 am

IXIStreakIXI wrote:Yes it is. My Simul-class is 60/100.
Sorry, no.
The "Simul-Class/Class A" switches on heads are often mis-labeled "Half/Full Power".
Simul-Class is 75 watts Simul (all four tubes), 15 watts Class A (outside pair). The outside pair (ONLY) may be EL-34s or 6L6s. Green stripes go up to 85/25 as the outside pair is wired pentode.
There is no such animal as a 60/100 Simul-Class. It's either 60/100 -OR- Simul-Class.
Never both. Never. NEV-ER.
You can't run EL-34s in the outside pair of a 60/100. It's got to be all 6L6s.

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Post by mxr2000 » Mon Jul 28, 2008 12:28 pm

mine says on the back simull class and the half and full power switch is the front face plate and the reverb control is on the front face plate too

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Post by MrMarkIII » Mon Jul 28, 2008 1:16 pm

mxr2000 wrote:mine says on the back simull class and the half and full power switch is the front face plate and the reverb control is on the front face plate too
You have a "long" head. "Short" heads are 18.5 inches wide and the reverb knob's on the back like the combo. Eight knobs on the front = "long" head.
The "Simul-Class/Class A" switches on heads are often mis-labeled "Half/Full Power". This switch actually means:
Simul-Class is 75 watts Simul (all four tubes, "Full Power"), 15 watts Class A (outside pair of power tubes, "Half-Power"). The outside pair of power tubes (ONLY) may be EL-34s or 6L6s.

mincy
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Post by mincy » Mon Jul 28, 2008 1:20 pm

mxr2000 wrote:mine says on the back simull class and the half and full power switch is the front face plate and the reverb control is on the front face plate too
Mine is the same. Simul class label on the back, half/full switch and reverb on the front. It's a red stripe head.

Image
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mxr2000
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Post by mxr2000 » Tue Jul 29, 2008 3:16 pm

mincy wrote:
mxr2000 wrote:mine says on the back simull class and the half and full power switch is the front face plate and the reverb control is on the front face plate too
Mine is the same. Simul class label on the back, half/full switch and reverb on the front. It's a red stripe head.

Image
Image

Hey thats how mine looks too. but sure with the blue stripe :D

mxr2000
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Post by mxr2000 » Tue Jul 29, 2008 3:20 pm

MrMarkIII wrote:
mxr2000 wrote:mine says on the back simull class and the half and full power switch is the front face plate and the reverb control is on the front face plate too
You have a "long" head. "Short" heads are 18.5 inches wide and the reverb knob's on the back like the combo. Eight knobs on the front = "long" head.
The "Simul-Class/Class A" switches on heads are often mis-labeled "Half/Full Power". This switch actually means:
Simul-Class is 75 watts Simul (all four tubes, "Full Power"), 15 watts Class A (outside pair of power tubes, "Half-Power"). The outside pair of power tubes (ONLY) may be EL-34s or 6L6s.
Man this most be the loudest 15 watts on earth.. :lol:

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goodwill559
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Post by goodwill559 » Tue Jul 29, 2008 3:39 pm

Should be 25 watts with the EL's wired pentode, IIRC.

mxr2000
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Post by mxr2000 » Tue Jul 29, 2008 3:47 pm

goodwill559 wrote:Should be 25 watts with the EL's wired pentode, IIRC.
thanks for the tip :D

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