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Vintage Asylum Classic gear from yesteryear; vintage audio standing the test of time. |
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Vintage Asylum Classic gear from yesteryear; vintage audio standing the test of time. |
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In Reply to: phono noise floor posted by David Smith on February 23, 2015 at 20:15:19:
Fact: S/N in phono is poorer than line level sources, especially digital. You may be running into some fundamental limits.
1st, buy a pair of culled phono grade 12AX7LPS tubes from AA sponsor Jim McShane. 2nd, clean your switches with Caig DeOxit. You may get adequate relief by installing superior noise factor 'X7s and switch cleaning.
If, as I fear, top notch tubes and switch cleaning do not provide sufficient relief, reengineering may be needed. Do you exploit the multiple EQ capabilities of the unit? If not, as is so frequently the case, getting switches out of mV. level signal lines is very much in order. A single pair of RCA jacks hard wired to the low level mag. preamp permanently configured for RIAA is the way to go. All source selection occurs at line level, where it is less likely to cause grief. Fewer mechanical connections in the signal path NEVER hurts.
Passive EQ phono sections exhibit better overload behavior than active EQ setups. The tweaked RCA setup I've uploaded exhibits superior bass extension and it REALLY can drive the recording O/Ps. ;>) A little TO92 case LR8 regulator in each channel takes care of the 250 VDC requirement and makes for good channel separation.
Eli D.
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Follow Ups
- RE: phono noise floor - Eli Duttman 21:56:26 02/23/15 (7)
- Dang - Awe-d-o-file 07:47:13 02/24/15 (3)
- RE: Dang - David Smith 09:47:12 02/24/15 (2)
- RE: phono noise floor - David Smith 22:14:41 02/23/15 (2)
- RE: phono noise floor - Eli Duttman 22:35:59 02/23/15 (1)
- RE: phono noise floor - David Smith 22:37:28 02/23/15 (0)
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