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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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I've just built my monobloc 807 Williamson amp. I'm experiencing lots of problems with HISS (not HUM). My problem is the amp has too much gain. I only have like 3 usable notches on the preamp dial before it goes way too loud. I suppose having 104dB efficient speakers doesn't help.I have not employed any negative feedback and curious about how bad it is? Many swear it's the devil to use and I havn't came across many of those that insist some form of NFB should be used. However, a -20dB Feedback would help a lot in the abnormally high gain (which is probably where i'm getting so much hiss from).
Full schematic and details can be found here:
http://www.retrovox.com.au/A515.pdfBQ
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Topic - Too Much HIGH GAIN - Just Build 807 Williamson A515 - Use of NFB? - Super_BQ 14:11:51 12/02/06 (24)
- I've settled with 4.7kohm for now - Super_BQ 01:44:05 12/04/06 (0)
- I built a very similar version... - DaveInVA 08:32:10 12/03/06 (0)
- Re: Too Much HIGH GAIN - Just Build 807 Williamson A515 - Use of NFB? - Paul Joppa 21:19:04 12/02/06 (6)
- Re: too many flames for my comfort level! - Chris O 07:42:28 12/03/06 (5)
- Re: too many flames for my comfort level! - Tre' 09:27:37 12/03/06 (3)
- "I don't want it to sound good to me, I want it to sound right." - Chris O 11:09:51 12/03/06 (1)
- agreed. (nt) - Tre' 19:01:02 12/03/06 (0)
- too many flames - No Way 09:54:13 12/03/06 (0)
- Re: too many flames for my comfort level! - Eli Duttman 07:51:32 12/03/06 (0)
- Re: Too Much HIGH GAIN - Just Build 807 Williamson A515 - Use of NFB? - Steve O 18:50:19 12/02/06 (2)
- Re: Too Much HIGH GAIN - Just Build 807 Williamson A515 - Use of NFB? - Super_BQ 03:19:42 12/03/06 (1)
- Re: Too Much HIGH GAIN - Just Build 807 Williamson A515 - Use of NFB? - Steve O 17:45:33 12/03/06 (0)
- Re: Too Much HIGH GAIN - Just Build 807 Williamson A515 - Use of NFB? - lovetube 17:51:59 12/02/06 (3)
- Re: Too Much HIGH GAIN - Just Build 807 Williamson A515 - Use of NFB? - Super_BQ 01:51:36 12/03/06 (0)
- That's interesting! - Ray Moth 18:08:41 12/02/06 (1)
- Re: That's interesting! - lovetube 20:12:18 12/02/06 (0)
- Re: Too Much HIGH GAIN - Just Build 807 Williamson A515 - Use of NFB? - Jim McShane 14:55:35 12/02/06 (6)
- I Can't Believe the DIfference - Super_BQ 17:50:24 12/02/06 (5)
- Re: I Can't Believe the DIfference - Jim McShane 07:54:58 12/03/06 (0)
- Re: I Can't Believe the DIfference - sorenj07 19:01:10 12/02/06 (3)
- NFB does not reduse power - Ray Moth 03:33:07 12/03/06 (0)
- R25 - References - Super_BQ 02:38:33 12/03/06 (0)
- yes 3k is too low - lovetube 20:14:17 12/02/06 (0)
- Re: Too Much HIGH GAIN - Just Build 807 Williamson A515 - Use of NFB? - fatbottle 14:34:26 12/02/06 (0)
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