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I have a 10A 125VAC switch here but I'm not sure if it is rated for that purpose ? Any suggestion ?

I'm thinking of a setup to switch the C23 cap on and off so I can have both the old and new Mark IV lead sound. See pics : http://pages.videotron.com/heliweb/MarkIV-c23mod.jpg I found a place to install the switch under the chassis, below the Loop Select switch. I would like to know if such...

Thanks for the infos ! I replaced all preamp and power amp tubes and changed the two 220uF/300V caps with new F&T and I ordered three 30uF/500V Atom to replace the old Mesa caps. See some pics here : http://pages.videotron.com/heliweb/MarkIV

1991 (6-26-91 Wa written on the chassis) Serial IV 2799

Boogiebabies, For the mod What is the cap number you are refering to in the Mark IV V3B schematic ? When you say sniping out, I assume you mean removing the cap and replacing it with a jumper wire ? Thanks

Sorry guys, I was wrong, the 12AT7 in my Mark IV is in V4 not V5.

I'm the owner of a used 1991 Mark IV (June 26, 1991) The tube configuration is written under the chassis with a black marker near each socket as follow : V1, V2, V3, V4 = 12AX7 and V5 = 12AT7 Is there anyone who own a Mark IV with same configuration as mine ? Normally, 12AT7s are used in the...

I bought a used Mark IV (1991) a year ago, I installed brand new Elctro-Harmonix tubes in the preamp stage and Svetlana in power amp (all 6L6) stages. I play with an Ibanez RG-42 with Dimarzio Evolution pickups and a Jackson RR-3 w/ Duncan Designed pickups. I found that my lead sound is a...