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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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In Reply to: What "recipe changes" brought the treble back? posted by andy evans on July 22, 2006 at 02:53:27:
My tech found I was running the tube too low. I had it biased at 9MA per half(as per the tube manual) and that was rolling off the top end. That was the main cause but he also put a 47UF cap after the 100 ohm resistor. That in itself lowered the impedance of the power supply. It is drawing 20 MA per half and it sounds awesome. I know some are saying the tube life will be shortened considerably but who cares? This preamp sounds awesome. Besides, 6SN7's are cheap. I haven't listened to anything but CD since it was changed and I hate CD, but not any more. I am actually looking foward to getting a good player and DAC.
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Follow Ups
- Re: What "recipe changes" brought the treble back? - xaudiomanx 07:39:18 07/22/06 (8)
- 47uf on the plate of the tube to ground ? - lovetube 04:15:56 07/23/06 (0)
- How do you define "cheap"? - Lew 09:18:42 07/22/06 (6)
- Re: How do you define "cheap"? - xaudiomanx 18:42:39 07/22/06 (0)
- Yes - what's the treble rolloff issue with book currents?? - andy evans 11:07:38 07/22/06 (4)
- I'll bet it's due to a high value volume control ... - Naz 04:39:03 07/23/06 (3)
- Possible but doubtful.... - JimL 12:57:06 07/23/06 (2)
- Re: Possible but doubtful.... - Naz 01:26:44 07/24/06 (1)
- Re: Possible but doubtful.... - xaudiomanx 05:07:59 07/24/06 (0)
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