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Dirty-South Blues Harp forum: wail on! >
To Trade or Not to Trade My Amp
To Trade or Not to Trade My Amp
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tmf714
1950 posts
Sep 08, 2013
1:26 PM
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Rick- Refer to my post at 11:39 am-
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5F6H
1665 posts
Sep 09, 2013
3:50 AM
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@Rick "A 12AU7 tube produces only 19% of the gain of a 12AX7 tube. If you swap out the 12AX7 tube for a 12AU7 your 5 watt amps just became a 1 watt amp. Your power tube may still have the potential to make 5 watts, but it can't with the reduced signal it is receiving. Using the sports car analogy, you still have the big motor but it isn't making 500HP any more. There is a kink in the fuel line."
I see what you are saying here Rick, but typically 5W amps are still built with enough gain to make maximum power with a 12AU7. If you are going to use an automotive analogy, then gearing might be a better fit?
Swapping a 12AX7 for a 12AU7 is like fitting high gearing for touring, no good for off road. 12AX7 is like low gearing - fast, snappy response? Just like gearing doesn't affect power output at the wheel, it does affect response and top speed vs road loads in a given real world situation...too high - loose, sluggish pick up (too soft a tone), in extreme cases you won't have the torque to pull a very high gear and top speed (loudness for the amp) will suffer.
Too low and you have to be more careful with the throttle, you might end up red-lining the revs (distortion/feedback) in top before potential top speed (loudness) can be hit?
Just the way I see it...
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5F6H
1666 posts
Sep 09, 2013
3:50 AM
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Double post.
Last Edited by 5F6H on Sep 09, 2013 3:50 AM
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MN
272 posts
Sep 09, 2013
4:08 AM
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In about 1999 or so, I sold off my SF Princeton Reverb. I've sold or traded a ton of gear over the years, but I regret that boneheaded move more than anything else. Not even close.
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