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Can you substitute a 6L6GA for a 5881? What is the difference between a 6L6GC and A 6L6GA?
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Thanks!
Like chris says it depends on the amp..I run 6L6g tubes in my mc240 a lot of times and even tho the plate voltage can run at 435 or 465 depending where I set the switch,the 240 is easy on those tubes because it runs mostly in class B but if you raise the neg bias voltage in your amp, and you can do this many times by changing the bias resistor to a smaller value,you can then somtimes run tubes like the 6L6ga or 6L6g.
You can replace a 5881 with a 6L6GC. The 6L6GA/GC has a larger bulb diameter and may not fit in a space designed for a 5881.Note: The 6L6GA/GC has higher plate and screen dissapation ratings than the 5881; In other words, you can replace a 5881 with a 6L6GC/GA, but not visa versa.
Regards,
Mike,The GA has a 19 watt plate dissipation and the GC has a 30-32 watt plate dissipation - they are very different tubes. The GA could have an ST envelope but I'm pretty sure no GCs did - and some GCs have the same envelope as 5881s. But you're right, in general, these take up more space than 5881s (6L6GWB).
Look them up on the Duncan site. He has a very nice tube datasheet reference.To answer your question, it depends on the parameters of your amp. If your amp is wringing the life out of a 5881 (high voltage and high current) the GA will fail. If your amp is running things pretty easy, then you can substitute.
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