captainbeefheart Posted April 21, 2022 Share Posted April 21, 2022 These are actually extremely nice tubes, they test lower than simulation for distortion so they were either screened or the manufacturing process was dialed in well and on average they are very linear. I had less of these to match up so I was able to make a really nice pair with no noise, triode sections are matched, gain matched and as mentioned they have very low distortion for all sections. These bested the simulated distortion spec which is pretty impressive, I rarely see that. Mind you gain was strong also which double rare, usually when I see higher gain distortion increases but these are actually quite impressive. $60/pair includes shipping Thanks! Quote Link to comment Share on other sites More sharing options...
captainbeefheart Posted April 21, 2022 Author Share Posted April 21, 2022 From Brent Jesse Recording: "Very fine sounding, very rare blackplates from the 1940s. These are virtually identical to the JAN Raytheon VT231 orange label tubes above, but you pocket the savings. Most have the extra plate support rods. These rival the RCA 5692 redbase in quality, and are just as scarce. " Quote Link to comment Share on other sites More sharing options...
mikebse2a3 Posted April 21, 2022 Share Posted April 21, 2022 I’ll take these if still available …. sending a pm Quote Link to comment Share on other sites More sharing options...
captainbeefheart Posted April 21, 2022 Author Share Posted April 21, 2022 SOLD Quote Link to comment Share on other sites More sharing options...
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