Okay, this is pretty embarassing but in the interest of promoting a great tube, I thought I'd share it anyway. Around a year ago I re-purposed a PP KT88 monoblock pair into a pair of SE 300B amps (yes, new OPT, driver, etc.). I used an EL84 driver, set the 300B to around 350v and 70ma, DC heaters. When I first listened I thought it sounded really nice, the bass was especially tight compared to other 300B amps I've built. Everyone who has heard it has enjoyed it. This weekend I took them to an audio buddy's house because he wanted to hear 300Bs. He commented on the 2A3s I had plugged into the amps. No, I said, they are 300B's. Well, sure enough, I had grabbed a pair of JJ 2A3s from the bench and used those instead of 300Bs. They are the same tubes I've been running in this since I built it about a year ago. I never caught the big red lettering: "2A3-40". That means I've been running them at 24 watts, but more interesting is that I had 5v on the fils, not 2.5 - talk about a stress test! Once I get them hooked back into the system, I'll swap in some 300Bs and see how they sound with the right tube. :-)
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Topic - Amazing JJ 2A3-40's - SteveBrown 08:09:56 03/09/15 (28)
- Could someone summarize all this? - Frihed89 16:15:31 03/13/15 (5)
- RE: Could someone summarize all this? - Caucasian Blackplate 12:42:21 03/14/15 (4)
- RE: Could someone summarize all this? - Tre' 13:30:13 03/14/15 (3)
- RE: Could someone summarize all this? - vinnie2 05:33:59 03/15/15 (2)
- RE: Could someone summarize all this? - SteveBrown 07:45:31 03/15/15 (1)
- RE: Could someone summarize all this? - Tre' 12:57:33 03/15/15 (0)
- RE: Amazing JJ 2A3-40's - Paul Joppa 12:22:33 03/09/15 (0)
- RE: Amazing JJ 2A3-40's - drlowmu 11:08:58 03/09/15 (20)
- RE: Amazing JJ 2A3-40's - RC Daniel 13:17:33 03/11/15 (19)
- RE: Amazing JJ 2A3-40's - Chip647 06:39:17 03/12/15 (18)
- RE: Amazing JJ 2A3-40's - Tre' 07:54:16 03/12/15 (17)
- RE: Amazing JJ 2A3-40's - Palustris 18:18:22 03/12/15 (5)
- Yes, obviously I am spewing sophistry. Heresy! - Chip647 19:23:18 03/12/15 (4)
- RE: Yes, obviously I am spewing sophistry. Heresy! - RC Daniel 19:47:18 03/12/15 (3)
- RE: Yes, obviously I am spewing sophistry. Heresy! - Palustris 11:22:31 03/13/15 (2)
- RE: Yes, obviously I am spewing sophistry. Heresy! - Paul Joppa 12:53:30 03/13/15 (1)
- RE: Yes, obviously I am spewing sophistry. Heresy! - RC Daniel 15:43:19 03/13/15 (0)
- RE: Amazing JJ 2A3-40's - kyle 09:40:27 03/12/15 (10)
- RE: Amazing JJ 2A3-40's - Tre' 14:25:21 03/12/15 (9)
- RE: Amazing JJ 2A3-40's - SteveBrown 15:28:07 03/12/15 (8)
- RE: Amazing JJ 2A3-40's - dave slagle 18:52:37 03/12/15 (7)
- Measurements - SteveBrown 16:06:58 03/13/15 (6)
- RE: Measurements - dave slagle 21:52:39 03/13/15 (1)
- RE: Measurements - SteveBrown 14:22:59 03/14/15 (0)
- RE: Measurements - kyle 17:53:03 03/13/15 (3)
- RE: Measurements - Tre' 07:52:43 03/14/15 (2)
- thanks. - kyle 11:25:10 03/14/15 (0)
- RE: Measurements - SteveBrown 09:26:58 03/14/15 (0)