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Yesterday I heard the dreadful, loud tearing cloth sound from my right mono block, a push-pull Mullard 5-20 circuit from diyaudio.com (see link).I played another set of tubes, EL-34s for an hour no issues. I put the same Gold Lion KT-88s back in and after 5 minutes, bad noise. I barely touched the right hand tube of the pair after it quieted, bad noise. Switched the tubes left and right, now the noise recurred from the same tube, again after a cool down and a few minutes of operation and the onboard meter pegged to the 100 mA limit.
So I again tested the "bad" tube in my ancient Eico 666 with the KT-88 parameters not on the roll but from the Alabama site. It test the same as before, Good.
A head scratcher?
Edits: 02/07/16
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Topic - Need help with KT-88 that tests good but plays bad - kitch29 08:21:23 02/07/16 (44)
- Can you post a schematic that doesn't require membership? - Triode_Kingdom 21:42:59 02/07/16 (32)
- RE: Can you post a schematic that doesn't require membership? - kitch29 05:37:13 02/08/16 (31)
- Here it is. - Eli Duttman 09:38:57 02/08/16 (29)
- Thanks & a Question - Triode_Kingdom 13:12:04 02/08/16 (28)
- RE: Thanks & a Question - Eli Duttman 14:05:09 02/08/16 (27)
- RE: Thanks & a Question - Triode_Kingdom 15:35:18 02/08/16 (26)
- RE: Thanks & a Question - Eli Duttman 16:55:53 02/08/16 (25)
- RFI - Triode_Kingdom 05:46:30 02/09/16 (24)
- RE: RFI - Eli Duttman 09:27:30 02/09/16 (23)
- RE: RFI - Triode_Kingdom 10:59:23 02/09/16 (22)
- RE: RFI - Eli Duttman 11:56:58 02/09/16 (21)
- RE: RFI - Triode_Kingdom 12:06:34 02/09/16 (20)
- RE: RFI - Eli Duttman 14:09:26 02/09/16 (19)
- RE: RFI - Tre' 09:04:22 02/10/16 (1)
- RE: RFI - Eli Duttman 10:18:02 02/10/16 (0)
- Conduction Angle - Triode_Kingdom 20:05:53 02/09/16 (16)
- RE: Conduction Angle - Eli Duttman 21:35:16 02/09/16 (15)
- RE: Conduction Angle - Triode_Kingdom 08:23:48 02/10/16 (13)
- RE: Conduction Angle - Eli Duttman 10:44:36 02/10/16 (12)
- I wasn't discussing what you hear - Triode_Kingdom 11:45:56 02/10/16 (11)
- RE: I wasn't discussing what you hear - Tre' 19:17:15 02/10/16 (10)
- RE: I wasn't discussing what you hear - Triode_Kingdom 07:13:27 02/11/16 (9)
- RE: I wasn't discussing what you hear - Tre' 07:30:51 02/11/16 (8)
- RE: I wasn't discussing what you hear - Triode_Kingdom 08:54:47 02/11/16 (7)
- RE: I wasn't discussing what you hear - Tre' 09:21:28 02/11/16 (6)
- RE: I wasn't discussing what you hear - Triode_Kingdom 13:15:40 02/11/16 (5)
- RE: I wasn't discussing what you hear - Tre' 14:17:00 02/11/16 (4)
- RE: I wasn't discussing what you hear - Triode_Kingdom 14:44:52 02/11/16 (3)
- RE: I wasn't discussing what you hear - Tre' 17:32:00 02/11/16 (2)
- RE: I wasn't discussing what you hear - Triode_Kingdom 18:53:08 02/11/16 (1)
- RE: I wasn't discussing what you hear - Tre' 20:24:27 02/11/16 (0)
- RE: Conduction Angle - Jim McShane 06:10:50 02/10/16 (0)
- RE: Can you post a schematic that doesn't require membership? - Eli Duttman 08:02:19 02/08/16 (0)
- RE: Need help with KT-88 that tests good but plays bad - tubular.well 10:21:42 02/07/16 (0)
- RE: Need help with KT-88 that tests good but plays bad - Caucasian Blackplate 10:05:36 02/07/16 (0)
- RE: Need help with KT-88 that tests good but plays bad - Jonesy 09:14:23 02/07/16 (7)
- RE: Need help with KT-88 that tests good but plays bad - Jim McShane 10:11:57 02/07/16 (6)
- RE: Need help with KT-88 that tests good but plays bad - Al Noakes 03:42:05 02/08/16 (5)
- RE: Need help with KT-88 that tests good but plays bad - Eli Duttman 06:57:36 02/08/16 (2)
- RE: Sockets and pins - kitch29 07:28:28 02/08/16 (1)
- RE: Sockets and pins - Eli Duttman 07:57:00 02/08/16 (0)
- RE: Need help with KT-88 that tests good but plays bad - Jim McShane 06:53:04 02/08/16 (1)
- RE: Need help with KT-88 that tests good but plays bad - Eli Duttman 07:01:05 02/08/16 (0)
- RE: Need help with KT-88 that tests good but plays bad - Michael Samra 08:58:21 02/07/16 (0)