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It's in the manual under the reverb section. http://www.mesaboogie.com/media/User%20Manuals/Mark%20III.pdf

The matching of some online retailers are not at the plate or bias voltage of the Mark series Boogies, so they might not match when installed in your amp. I have seen this on more than one occasion, so buyer beware !

Save your money, beat the bushes and wait for some good used Sylvanias to come up for sale. You will be glad at the peace of mind when it comes to using your amp with the tubes it was designed around. A good used Sylvania is just as reliable as ANY new production tube, if not a bunch more. Just...

No serial # , no deal !

http://forum.grailtone.com/viewtopic.php?f=27&t=42596&p=306969&hilit=Stacked+pot#p306969 This is how you do it.

I have all Sylvania power tubes in my C+ Boogies. The ONLY way to go in my opinion. I have a box in the top of my closet that I have expressed to my family to NOT sell in a yard sale after my death. The 416's were much harder to come by, for sure. I bought one pair on Ebay that were listed as...

The Pentode/Triode switch affects the outer pair of tubes in Simulclass mode. Not sure how it works when the amp is switched to Class-A mode (outer tubes only).

Was it a 60W or a 60/100 set to 60W mode? Both of which are Pentode. If you like the "Pull Deep" use it on the C+. The only "triode" in the C+ is in the outer sockets of the Simulclass models, BTW.

MESA branded Sylvania STR-416's are the way to go. Yes they are expensive and hard to find, but WELL worth it. Nothing compares in my opinion. I have a pair of Phillips 7581A's that do the job nicely, as well.

It should fit. The original Mark I and IIA, along with some of the early IIB's had a wider bolt spacing on the chassis. Anything with the SUS4 mounting and beyond should be the same.

Touch your DVM to pin#3 on the PCB trace on the tube socket, and see what you get. That will tell the real story.

I do not know why your 105 PT is reading that much voltage. Are you measuring it at pin #3 with the tubes out of the sockets? It should be around 485v. The Coliseums will push around 530V if I remember correctly.

I have heard of the FX return jack contacts going bad if something is left plugged in for long periods of time. If running a short jumper cable from the FX Send to the FX return fixes the noise, then I would highly suspect that this is your problem.

Use the Post FX Level knob as the overall volume knob, and set the front panel Master at 4 or higher. Equal the channel volumes with the Lead Master front panel knob.

It is possible that the amp could have the X101 Power transfomer hard wired to the 120V taps, and have no voltage selector switch. I think that I saw one for sale on Ebay done this way.

It's not the output transformer, but the power transformer that you need to be concerned with. The 60 watt versions are supposed to send 448V to the plates of the power tubes. You will be fine.

The V1-V4 combination is what I run in mine, as well as the Sylvania power tubes. V-5 will be to taste, per application. I have a pair of MS-12's (from a metal grille 4x12) stashed away, because I can't part with them, as they are hard to find. I told you that it would sell fast! 8)

With all those tubes, and that speaker, that is a very good price. It will be gone soon. If I needed another one in the stable, I would be all over it. Good luck with the sale!

Oh, I know, but with a few others. 8)

I don't know about "Blackface" as the only one that I have ever used was an old Bassman, and that was over 30 years ago. What I will say is that the rhythm channel on the IIB was very nice, a bit more rounded sounding than the C+. The attack was not as immediate. With the "Post FX Level" mod...