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In Reply to: What's the better 5814a posted by kkak66 on July 9, 2015 at 22:28:28:
Unless a 12AU7 is used in follower mode (mu or cathode follower) with full degeneration ie 100% local feedback, they aren't a good audio tube at all. Not good for gain duty. Any working 12AT7 or AY& will eat them for breakfast.
This information has been around for a long time, and you haven't noticed?
If you want to improve the sound of a device with 12AU7s 'designed?' into them and used to provide signal gain, replace them with something else within the power transformer's heater limits.
If those limits won't allow you to do that, get rid of the device.
Rolling 12AU7s, in gain stages, is a waste of money and time.
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
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Follow Ups
- To worry about which variety of 12AU7 is better, seems a bit pointless to me - Timbo in Oz 00:37:32 07/10/15 (9)
- RE: To worry about which variety of 12AU7 is better, seems a bit pointless to me - Mechans 05:25:34 07/10/15 (8)
- I found that rolling it had less of an impact on the sound than I usually find - Timbo in Oz 14:40:49 07/10/15 (4)
- RE: I found that rolling it had less of an impact on the sound than I usually find - Mechans 17:55:59 07/13/15 (3)
- The 6SN7 is a fine tube, the 6CG7 is the noval/9 pin smaller version - Timbo in Oz 20:28:27 07/13/15 (2)
- RE: The 6SN7 is a fine tube, the 6CG7 is the noval/9 pin smaller version - Mechans 12:21:32 07/25/15 (0)
- RE: The 6SN7 is a fine tube, the 6CG7 is the noval/9 pin smaller version - Mechans 14:54:40 07/14/15 (0)
- RE: To worry about which variety of 12AU7 is better, seems a bit pointless to me - Eli Duttman 11:33:50 07/10/15 (1)
- OK that makes sense.sort of? - Mechans 13:51:50 07/11/15 (0)
- RE: To worry about which variety of 12AU7 is better, seems a bit pointless to me - Caucasian Blackplate 10:00:47 07/10/15 (0)