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Could be a lot of things.Its very possible its just a dirty, oxidized tube socket.Or a bad tube, as wildschwein says.Another likely cause is plate caps.You say the amp has sat unused for over a year.This practice is not good for your power supply filters.They will actually wear faster when not...

Is the amp still stock?Ever had the filter caps changed?

I have used them in my IIC+ with no problem.They are sturdy tubes, but you will be using them above their rated voltage and I wouldnt recommend it.

Depends on what you mean by "kicks ***"

If its been sitting since 94 unused have the power filters changed before you have serious problems.At this point its not "proactive",that ship sailed 10 yrs ago.

It happens.Especially with these current production tubes.Glad you got it sorted out.Looking at the "new" pic,I see a loose red wire hanging by those 220uf's.

Although its not absolutely necessary to "pre-form" electros,its not a bad idea,I do it with all new caps.But thats not likely the problem.It is possible that because you changed the main supply caps the voltage downstream to those old caps is stiffer and after a while the extra voltage is...

I've no experience with the Canabis Rex,but it would seem to me that the EV would be the most suited for the clean jazz tone you are looking for.

They build great speakers so I would think a re-cone would be a simple job for them.I never had them re-cone one,but when I did my first re-cone years ago when Ted was still around he was very helpful with advice.A Jensen 15".When I got halfway thru I found the coil post was crooked.He had me...

Gotta look at what was done when they did the mod.Some techs put a resistor in series with the bias pot.When I do a bias adj mod,I dont use a resistor in series with the pot.As a rule of thumb,I use a pot that is 2x's the value of the stock resistor that is there.i.e if theres a 50k stock...

Its been a while since I've been in a MKiv,but when I was I dont recall any mistakes in that schem.Most of the iv's I've worked on were cap jobs but a few I did adjustable bias mods and one had a blown 6L6 that took out that screen resistor.I would still replace those 470 ohm screen resistors...

Did somebody alter things in there before you got it?

I would just replace the "open" 470 ohm resistors and pay no attention to the resistors whose values dont seem "right" unless you have other problems after you get those inner sockets to stop red plating.

That "20ma" you posted means nothing without knowing the plate voltage and calculating the dissipation wattage.Mesa does bias very cold.I like mine to be about 70% of total plate dissipation,which is typical for 6l6GC in class AB.So if plate volts are at,lets say,425vdc I adjust to about...

Like I said in my previous post,that 0 volts on your screens is a problem.I suspect the screen resistors are "open" and not letting the voltage thru to your screens.

That 0 voltage at pin 4 is the problem.Those 220k resistors wont block all the voltage,or as you "prevents an accumulation of charge to sustain a readable voltage",they are "open" and need to be changed.

A big factor in any amp is where the power tubes are biased.I remember,years ago,Tony Bruno was still developing his line of amps and doing work for the Cars.I had a Gauss speaker he wanted so he agreed to re-tube 3 amps I had in exchange.One of the amps was my 2C+ which I had just gotten from a...

Seriously doubt the courtesy outlet had anything to do with it,just a coincident.The tube blew and took out the fuse,as it should.If you really feel it had something to do with it,just dont use the outlet anymore.

And you aint wrong,at least for you.Tone and feel of an amp is totally subjective.One of the main reasons why I wont repair or mod an amp that requires shipping.

Before you go any further bridge the effects loop with a cable.