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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: TY both VM. I haven't noticed a difference in gain among the four... posted by jeffreybehr on October 11, 2014 at 15:13:43:
Measured these installed in my WAVAC MD-805ms driving (full-range) only the MR and treble of my Serenity Super-7s. Used broadband pink noise; measured with A-weighting to reduce the affects of low-frequency traffic noise, at the listening position. Amps' level controls (already set to c. 9:30-o'clock) were tweaked slightly to equalize the 2 channels' output levels using the original GE 5751s. That setting proved excellent--the average left-to-right level difference averaged 0.1dB (no, I can't measure noise that accurately, but that's the result of the arithmetic using raw numbers to the 1/4dB).
-----------------------------L--------R-------Av.
GE5751........................75.........75..........75
Mullard CV4024.........73-1/2...73-3/4..73-5/8
JJ ECC81......................73.......72-3/4...72-7/8
Old Tung-Sol 12AT7..72-3/4...72-3/4..72-3/4
Philips E180CC...........71-3/4...71-1/4..71-1/2
FWIW.
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Follow Ups
- So I measured five '12AT7s'. - jeffreybehr 16:34:31 10/11/14 (0)
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