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Finally i've retubed my Mark IV with 2 Sylvania 6l6gc, and 2 Mullards EL34 in outer sockets.Believe me it is not subtle.This is place where Mark IV wanna be. I have bunch of power tubes: Mesa, JJ, SED , etc. But this is expensive sound.No more experiments on power tubes for me.

Thanks!

It's a hand made.I've order it.

Mesa Boogie Mark IV head shell.

When combining two 6l6 and two 5881 tubes,in which sockets go 5881?In A or B sockets?Is it safe in both ways? Thanks!

Hi, is it possible to mod Mark IV inner tube sockets to run El34 like outer, with bias switch 6l6/El34? So if i wanna go with all four El34 or go back with 6l6. Thank you.

Thank you!

Hi, i have purchased ext.cab for my Mark IV combo.Cab is 8ohm and integrated speaker in combo is also 8ohm.Is it safe to leave integrated speaker on 8ohm tap on amp and ext.cab on 4ohm tap because sounds better to me that way?I know correct match is both speaker on 4ohm tap. Thanks!

Yes my Mark is A version and has dedicated reverb tube.I'm just curious can it be run safe without reverb tube.If anyone know for sure,please answer. Thanks!

My Mark IV is (a) version with reverb tube.I'm just curious can it be run safe without reverb tube.

Hi, is it safe to run Mark IV(a) without reverb tube pluged in? Best regards!

Hi, i need some advice.I have Mark iv(a) combo in very,very good condition and i am very satisfied with this amp.But, there is opportunity to add some cash and replace it with Mark v combo.Is it really worth it?Is it Mark v better amp?I ask this because Mark series are not plug and play amps and...

Thanks!

Just a simple question!Can i in any way damage something in the amp if i put 12ax7 tube instead 12at7 reverb tube?Thanks!

Hi,I'm new on board.Recently I've purchased Mark IVa compact combo in mint condition.Only issue is that is not original speaker in there.My combo is with Celestion V30.Unfortunately in my country there is no place where I can buy original speaker, but I'm very satisfied with V30. Best regards to...