Mesa IIC+ and STR-415's?

Koadogg · Feb 27, 2012

I have a mesa IIC+ 60W and want to get a set of 415's. I found a decent set of Sylvania 6L6GC STR-415's but need to know what I need to look for to ensure that they will work in my IIC+ without having to bias them. Any information will be helpful.

Thanks in advance!

MrMarkIII · Feb 27, 2012

Mesa Mark amps were designed around those tubes.
The only issue might be how much they were used and/or abused.
But I'd bet even old STR-415s are better than most of the stuff available.

Jackie · Feb 27, 2012

If you're buying used tubes there isn't much you can do to "insure" it will work. You can visually inspect it for any cracks, holes, white/gray dust etc. to see if the tube is completely bad or not but that's about all you can do without popping it in and playing an amp.

Koadogg · Feb 27, 2012

So long as they are a matched pair, I should have no issue with biasing?

MrMarkIII · Feb 28, 2012

Koadogg said:
So long as they are a matched pair, I should have no issue with biasing?

No issue. It's what Mesa amps are famous for. Or infamous.
Tubes with the Mesa label are matched to the fixed bias of the amp.

tony777 · Feb 28, 2012

is there a way to measure that the tubes run in the correct range?

dodger916 · Mar 7, 2012

tony777 said:
is there a way to measure that the tubes run in the correct range?

Yes, but you'll need a tester that will run similar plate voltages to your C+. Many testers top out at 400 volts, or 50 to 60 volts short of the C+. Though you should be safe using Mesa STR415's, tube performance does drift over time.

Mesa IIC+ and STR-415's?

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