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In Reply to: RE: If you are experiencing micro phonics with the 12au7(s) used in... posted by DeKay on July 01, 2017 at 13:36:26
Thanks for the suggestion. I'll experiment and keep that in mind. Are mine the long plates (based on the pictures)? Mine were all made in 1958 according to Brett Jesse and also the code numbers etched into the glass at the bottoms.
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"If you are the owner of a new stereophonic system, this record will play with even more brilliant true-to-life fidelity. In short, you can purchase this record with no fear of its becoming obsolete in the future."
Follow Ups:
As you have 4 of the LP's and assuming that only 2 of them are used for gain you could try the noisy tube in a non gain position (which would get you up and rolling right away assuming the other 3 are much less noisy).Ask your dealer about which positions/sockets do what within the preamp and then swap the tubes accordingly.
If this works then you have plenty of time to research backup tubes.
Edits: 07/02/17
I figured as much when inserting the JJs stopped the static sound through the headphones and what seemed like microphonics.I just reversed the matched pairs, so the pair that was in the diver sockets are now in the gain sockets and vice versa. The preamp sounds fantastic. No static through the headphones and a wonderful, rich sound with strong bass.
I bought the tubes through my local dealer, who sourced them from Brett Jesse, and it's been just under 30 days since I bought them (but maybe more since my dealer did) so I'll call my dealer on Wednesday and see what he/Jesse can do regarding the bad tube.
Sounds great though. Now I have a better understanding of the limitations to the JJs. Though they have a lovely tubey sound in the Rogue, the highs are a tad bright and the bass a bit flabby. The Mullards sound more neutral from top to bottom. Less bright but more defined treble and more extended and defined bass. At least that's how I hear it.
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"If you are the owner of a new stereophonic system, this record will play with even more brilliant true-to-life fidelity. In short, you can purchase this record with no fear of its becoming obsolete in the future."
Edits: 07/02/17
My personal taste (in my setup) goes to those and the much later production SP mentioned.
I have quite a few of the Blackburn Ecc82's produced in the interim between the "Two" which are labelled standard Mullard as well as IEC Mullard & Daystrom (sp?) and I much prefer the expensive LP's and the less inexpensive later SP versions.
However, considering excessive noise the later SP's, properly screened would be a fine alternative, IMO.
I've read about the "special" current production 12au7's, but as they cost more than I've ever paid for old production (including LP's) I've yet to try any.
If you click on my system you will see that the electronics are separated from the listening room by a wall, but even with this I've experienced a few problems with micro phonic tubes.
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