#21
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how does it sound now with the 6550we?? |
#22
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Actually, after 150 hours, it sounds really good and I have no complaints. What I need to do is compare the 6550WEs to the originally shipped Sed 6550C directly. I just happen to have a new matched pair of the "Cs" waiting for trial, but it'll take me awhile to get around to it.
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#23
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I'm curious if you have the same experience as i had.
After 200 hours i also thought the 6550we was not so bad after all. It was pretty good actually. But when i installed the original 6550c it was a different story. What if you have the same experience? Should we all complaine and protest against ARC for this 6550we tube? |
#24
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"The Owner's manual has a typo error. It should read 6550WE. The 6550C has been out of production for about one year." I have a REF10 with the 6550we and no issues, I love the sound, no cons. regards, Nelson |
#25
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So... have run in a pair of SED 6550 "C" for 50 hours, and without doing a back to back comparison with the WE's (don't want to overflex the main board), I like the "C's" better. WE's are neutral; C's are natural. The WE's are not bad. They are just a little dry sounding in the upper mid and treble, don't have quite as much 3-D body, and not as big a soundstage. The WE's may have just a bit more leading edge definition. Tonal balance seems roughly about the same despite the difference in presentation.
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#26
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Sent from my iPhone using A.Aficionado |
#27
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__________________
Source:Michell Gyro, Garrard 301/401, Spirit of 75, Lenco, SME 309/IV.Vi, 3009 & 3012, Dennesen air bearing, Odyssey RP1 9' & 12', Fidelity Research fr-24, Zyx 4D/Bloom, Lyra Skala/Kleos, Denon 103/103r soundsmith OCL, Fidelity research MC201 Preamp/amp:Audio Research Ref Ann, Ref Phono 2se, PH3, SP-10, D-250, ARC ST-70C3, Pilot sa-232/260, Dynaco Mk 2, Quad II Speakers:Proac, Sonus Faber, Harbeth, Rogers, Spendor. Others: Conrad Johnson, Unison Research, Audionote. |
#28
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As far as I know, Audio Research selects the 6550 tubes for optimum values of transconductance and plate intensity in the power supply. Alternative tubes can have a wide variation in these parameters. How can we be sure you are listening to sound differences due to the tube type and not to the tube parameters when swapping tubes?
Last edited by microstrip; 02-11-2013 at 07:49 AM. |
#29
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Good question and a possibility. Tubes I used are very tightly matched at 450V @ plate/screen (ARC PS measured value - tube appears to be used as a triode mode regulator) with a G1 bias for both tubes almost within 1%. They have identical matching GMs. I was not able to measure the cathode or plate current at idle which would be highly desirable (I'm working on it) and that would answer your question. Can you measure the idle cathode / plate current or can you interpret values marked on the ARC tubes?
The WE's had about 60 hours on them when I listened and did improve a bit with break in. Last edited by Barry1; 02-11-2013 at 01:01 PM. |
#30
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