2. amps-preamps
  3. 161387-96791

Constant noisy tubes maybe go solid state?

I have a Quicksilver Line Stage Preamp (12AT7) mated to an Odyssey Khartago Stereo. Overall I like it. Way too much gain but I digress. Weeks after receiving it I rolled in a few different tubes, kinda fun to color the sound signature. I liked rhe RXA black plates I got and those stuck around for more than a year. They started going microphonic and making noises so I ordered another pair (noisy) then another different vendor (blasts of white noise) and another set that arrived today (one is noisy as holy hell and one seems fine).

So where does one order preamp quality tunes that are quiet? Is there something I’m not requesting when ordering? Maybe dump
snd go solid state? I’m trying to be humorous because I’m pissed. Ha.
gochurchgo
rodman99999
6,030 posts
 
Q) "So where does one order preamp quality tunes that are quiet?    Is there something I’m not requesting when ordering?"      A) Some tube mongers test their wares for noise (some don’t) and- typically, you must request the best, of those that do.     At Upscale; they’re graded.     Ask for their, "Platinum" or, "Kevins’ Stash" rated, for the quietest.    ie:  https://upscaleaudio.com/pages/test-equipment     and:  https://upscaleaudio.com/pages/grading-matching      Brent Jessee Recording is another excellent source, for noise-tested valves.    His method is outlined, on this page (second vid):  http://www.audiotubes.com/12ax7.htm
mesch
3,410 posts
 
+1 russ69. I would start by calling Mike at Quicksilver. 
elliottbnewcombjr
5,214 posts
 
I think it might be time to suspect the device rather than a consistent/persistent problem from multi-sourced tubes.


hilde45's avatar
hilde45
4,820 posts
 
Forget about Raven. QS is good stuff. I have the same Line Stage. After talking with Mike, you might consider Brent Jessee or Jim McShane. Both reply quickly and are willing to help. 
yogiboy's avatar
yogiboy
5,487 posts
 
I have that same preamp. I like vintage Ge 12ax7WA/6201 tubes. You should be able to get a matched pair from any reputable seller on ebay for less than 50 bucks!

The GE JG-12AT7WA vintage tube is a rugged, American-made workhorse produced for the U.S. military and used for computers and targeting equipment. This tube is usually very low in microphonics due to its rugged construction. The GE JG-12AT7WA had to work well under arduous conditions and was made with solid support rods and short, gray plates.
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