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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Hello all,
I built an amp from the Decware site in one of the articles entitled "The Taboo of amplifier design". The amp sounds great but I get instant audible hum from the speakers the moment I turn the power on. The hum disappears the instant the power switch is turned off but the music can be heard for an additional 7-10 seconds after power off. Am I correct in assuming that the source of hum is in the PSU filter?
Thanks,
Jim
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Topic - Instantaneous hum - breadhead 04:08:33 04/05/07 (38)
- What's your source? - cawa 11:54:03 04/09/07 (0)
- It hums because it doesn't know the lyrics. - floydandrews 12:02:35 04/06/07 (1)
- Ha! - AndrewLloydWeber 02:32:30 04/07/07 (0)
- Sorry, hum can happen due to MANY different cause... - Thomas Martens 19:27:23 04/05/07 (3)
- Which Jones Book? - Perseo 05:48:05 04/06/07 (1)
- Re: Which Jones Book? - Mahatma Kane Jeeves 18:21:14 04/06/07 (0)
- Re: Sorry, hum can happen due to MANY different cause... - breadhead 03:40:09 04/06/07 (0)
- More hum info - breadhead 16:35:28 04/05/07 (10)
- Hmmmmm... - Triode_Kingdom 07:42:39 04/06/07 (1)
- Re: Hmmmmm... - breadhead 09:13:34 04/06/07 (0)
- Then you have built yourself some sort of earth (hum) loop into... - Allen Wright 03:20:27 04/06/07 (7)
- Re: Then you have built yourself some sort of earth (hum) loop into... - breadhead 03:42:29 04/06/07 (6)
- " I am currently using a 12ga. bus for ground" - Allen Wright 07:54:03 04/06/07 (5)
- Implementation mistake - breadhead 11:04:39 04/06/07 (3)
- "I noticed that the signal input is not referenced to ground in any way" - Allen Wright 12:41:45 04/07/07 (2)
- Guess what I meant was... - breadhead 16:40:10 04/08/07 (0)
- Been doing some online studying - breadhead 16:36:45 04/07/07 (0)
- Re: " I am currently using a 12ga. bus for ground" - breadhead 09:19:03 04/06/07 (0)
- Is it a tube amp? If so, and it hums before the tubes have even... - Allen Wright 05:54:53 04/05/07 (10)
- Link to schematic - breadhead 16:17:30 04/05/07 (6)
- I take it you've noticed the mix-up between g1 and g2? - Ray Moth 16:09:15 04/08/07 (1)
- Re: I take it you've noticed the mix-up between g1 and g2? - breadhead 16:37:08 04/08/07 (0)
- Huh? Where is that cathode of the upper output tube going? - arend-jan 02:55:24 04/06/07 (1)
- Re: Huh? Where is that cathode of the upper output tube going? - breadhead 03:47:16 04/06/07 (0)
- Re: Link to schematic - 2wo 20:22:04 04/05/07 (1)
- Re: Link to schematic - breadhead 03:49:52 04/06/07 (0)
- Re: Is it a tube amp? If so, and it hums before the tubes have even... - breadhead 15:45:10 04/05/07 (2)
- Then you have made some sort of earth loop in the wiring and that's... - Allen Wright 03:16:23 04/06/07 (1)
- Re: Then you have made some sort of earth loop in the wiring and that's... - breadhead 03:52:53 04/06/07 (0)
- Re: Instantaneous hum - Mahatma Kane Jeeves 05:02:29 04/05/07 (6)
- Re: It happened to me - stephen graham 08:25:50 04/05/07 (0)
- Could be, but what if he's linked the speaker gnd via heater gnd... - Allen Wright 05:57:08 04/05/07 (4)
- Re: Could be, but what if he's linked the speaker gnd via heater gnd... - Mahatma Kane Jeeves 06:52:09 04/05/07 (3)
- Re: Could be, but what if he's linked the speaker gnd via heater gnd... - breadhead 15:48:18 04/05/07 (1)
- Re: Could be, but what if he's linked the speaker gnd via heater gnd... - bpur 13:14:59 04/06/07 (0)
- Re: Could be, but what if he's linked the speaker gnd via heater gnd... - pipo 08:16:03 04/05/07 (0)
- My guess would be grounding. - Bas Horneman 04:22:27 04/05/07 (1)
- Re: My guess would be grounding. - b 15:50:52 04/05/07 (0)
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