Mesa IIC+ and STR-415's?

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Koadogg
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Mesa IIC+ and STR-415's?

Post by Koadogg » Mon Feb 27, 2012 9:46 am

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
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Re: Mesa IIC+ and STR-415's?

Post by MrMarkIII » Mon Feb 27, 2012 5:19 pm

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.

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Jackie
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Re: Mesa IIC+ and STR-415's?

Post by Jackie » Mon Feb 27, 2012 6:09 pm

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.
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Koadogg
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Re: Mesa IIC+ and STR-415's?

Post by Koadogg » Mon Feb 27, 2012 6:45 pm

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

MrMarkIII
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Re: Mesa IIC+ and STR-415's?

Post by MrMarkIII » Tue Feb 28, 2012 1:38 am

Koadogg wrote: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.

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tony777
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Re: Mesa IIC+ and STR-415's?

Post by tony777 » Tue Feb 28, 2012 10:36 am

is there a way to measure that the tubes run in the correct range?
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Re: Mesa IIC+ and STR-415's?

Post by dodger916 » Wed Mar 07, 2012 7:17 am

tony777 wrote: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.

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