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Re: Also, how often to check bias?

I have heard most people say 2, maybe 3 times/year. Recently I had a Mullard el34 (New Sensor-Russia) go bad which had me checking the bias every few weeks. The sound slowly got worse, so I checked it's bias to see that it ran up 15-20mA. I re-biased it a few times over the next month only to watch it finally not hold at all. The tube was only 4 months old.

I bias my Triode Corporation TRV-35SE at 40mA. I know of people running their el34s at 50-60mA and getting a decent lifespan out of them(over a year).

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