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In Reply to: Retubing recommendation posted by RogerT on March 11, 2012 at 14:30:26:
Low noise is EVERYTHING at MC μV. signal levels. Russian 6Н23П-EB (6n23p-ev) stock that's been carefully culled gets my nod. Tubes labeled 6922 sold under the ElectroHarmonix (EH) brand are 6Н23П-EB.
Noise is a primary consideration in MM phono sections too. The Sovtek 12AX7LPS is clean and quiet, which makes it a prime candidate for the job. The fact that it is priced modestly is icing on the cake.
Noise is not the driving factor for line stage tubes. Here, tone matters. "Reissue" Mullard long plates (also Russian) will provide some of the famous midrange accent.
The sonics of tubes used in regulators is of no particular importance. A EH labeled EF86 should do nicely for that "hole", should the tube currently in situ test weak. The EL86/6CW5 may be a problem. Test what's in the unit now. If it's still strong, leave it be.
Contact AA sponsor Jim McShane and explain your needs. Excellent service and fair prices are what you'll get.
Eli D.
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Follow Ups
- RE: Retubing recommendation - Eli Duttman 15:28:27 03/11/12 (4)
- RE: Retubing recommendation - RogerT 15:48:46 03/11/12 (3)
- RE: Retubing recommendation - Sondek 17:27:23 03/11/12 (2)
- I own a Jadis DA -60 - Mechans 16:12:09 03/13/12 (1)
- Correction the 2493 is also called E88CC-01 not ECC88-01 - Mechans 08:01:35 03/16/12 (0)