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Re: MP-3 tube life

Posted by Ralph (M) on May 2, 2006 at 08:30:44

In Reply to: Re: MP-3 DIY tweaking - possibility, resources? (long) posted by gordan on May 2, 2006 at 07:05:21:

The line section tubes last a very long time- if you run the preamp 24/7 they will go over a year with ease.

The phono tubes do not last as long- as they fade they become noisy. 24/7 operation will kill them in about 5 months. But if you are not using the phono, I would remove the rear 4 12AT7s (you need some of them in place, even though you are not using them).

If you do decide to use the phono the good news is that the 12AT7 is inexpensive.

Since you have been used to a transistor preamp, you have also been used to running the preamp all the time. You don't need to do this with the MP-3 or MP-1. Especially if equipped with Teflon caps and the regulators, the MP-3 will 'warm up' in a surprisingly short time 30-45 minutes.

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