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Re: AirTight ATM 2 Amplifier Help

71.111.66.8

Posted by who on August 21, 2005 at 08:42:42

In Reply to: Re: AirTight ATM 2 Amplifier Help posted by clennard on August 21, 2005 at 00:17:39:

Hi Clennard,

You turn the Bias (#2 and #4) to approximately set the overall bias to the middle area, and then you turn the Balance (#1 and #3) to give each tube the exact & equal bias level.
You use the front meter to monitor this procedure. It should take no more than a minute when you are familiar with it.
Be careful and insulate your screwdriver with some kind of tape because you COULD touch the amp interior in this process.
Please experiment with the bias level to your liking, but no lower than 3 dots from the bias “bubble”, where distortion appears.
I use Magnepan speaker, so the bass is still pretty fast at the lower bias setting.
Some people think this amp does not sound like a typical tube amp, and I agree. It has strong bass and does not roll off the treble.
For your reference, I use Telefunken 12AX7 and 12AU7, GE 12BH7, Electro-Harmonix KT88 and 6550.
You could also use Electro-Harmonix 12AX7/12AU7/12BH7 for a lot more bass and treble at a cost of a little more graininess.
I believe this amp was rated Stereophile class A 10-12 years ago.

I hope this helps.
Regards,
-who (my real name :) after the English translation)

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