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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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I Have VAC CPA-1 Preamplifier and am using it in passive buffer mode. There is a capacitor per channel between volume (replaced by attenuator) and input to the grid of 12AX7. I bypassed the capacitors and the output from attenuator was directly connected 12Ax7. It sounds better after the bypass but VERY LOUD TICK NOISE whenever the attenuator is stepped up or down and INCREASED HUM (sounds like AC hum). No hum or noise before the bypass.Shouldn't the capacitor be bypassed? Can the hum or noise be removed?
I would appreciate your help.
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Topic - Is it a redundant capacitor? - yhm23280 03:34:02 01/15/06 (8)
- Re: Is it a redundant capacitor? - pkell44 10:33:07 01/17/06 (0)
- Re: Is it a redundant capacitor? - DeanKS 12:56:32 01/15/06 (0)
- Re: Is it a redundant capacitor? - zanash 04:02:50 01/15/06 (5)
- Re: Is it a redundant capacitor? - yhm23280 04:36:37 01/15/06 (4)
- Tubed preamps often have DC Voltage on the input of the 1st gain stage. The Y-S Audios... - jeffreybehr 08:31:17 01/15/06 (3)
- Re: Tubed preamps often have DC Voltage on the input of the 1st gain stage. The Y-S Audios... - yhm23280 15:04:37 01/15/06 (2)
- "Do you think that the preamp input signal contains DC despite it passed a 8uF cap before exiting DAC?" - jeffreybehr 18:18:05 01/15/06 (1)
- Re: "Do you think that the preamp input signal contains DC despite it passed a 8uF cap before exiting DAC?" - DeanKS 10:01:15 01/16/06 (0)
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