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Sylvania Bad Boy 6SN7GT Matching Pair 1950 Rare Low Noise Preamp Tubes 3 - Rivet




Item History & Price

Information:
Reference Number: Avaluer:19863174
Original Description:
Very rare pair of 1950 3 rivet Sylvania 6SN7GT black plate "Bad Boy".Rare first run, 1950 C0M on glass and 039 on base. 95% + of these are from late 51' to early 53'Excellent Sound!! Listening tested in a preamp and Maxi-preamp noise tester for noise and low microphonics.Test in NOS range @ 3000/3000 & 3000/3050 where 1640 is min good for gm on a calibrated Hickok 539B.  Listening tested for low noise and microphonics.All tubes are guaranteed good or may be returned....Please see our other items for more vintage tubes & audio.No 1st class shipping to China, Russia, Oceania and some other countries, email for details.We combine orders for shipping.We don't change values for customs, please don't ask.Thank You.  

 


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