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Vacuum Tube - PX300B, Genalex Gold Lion, Gold Pin

Vacuum Tube - PX300B, Genalex Gold Lion, Gold Pin image 1
Customer image:<br/>"My home brew SE amps."
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Vacuum Tube - PX300B, Genalex Gold Lion, Gold Pin image 1
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Customer image: "My home brew SE amps."
Item ID: 039551
Starting at: $143.95
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Genalex Gold Lion PX300B power triode tube with gold pins. Made in Russia. In Europe during the 1930s the GEC (Genalex)/Marconi-Osram PX4 and PX25 power triodes were considered the finest audio triodes of their day. In keeping with the tradition of Genalex to provide the highest quality tubes, New Sensor has released the Genalex Gold Lion PX300B audio power triode. This tube is the highest quality 300B type available and is considered to be an upgrade in any 300B amplifier.

Part Numbers
Single or MatchedOur Part NumberUPC/EAN
Matched PairT-PX300B-GOLD-GEN-MP841358102677
Matched QuadT-PX300B-GOLD-GEN-MQ841358102684
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Product Reviews

5.00 out of 5 based on 1 reviews
5 out of 5

The Gold Lion Genalex PX300B matched pair are easily superior to the tubes I replaced. I had been using lower priced tubes from PSVANE and JJ. The Gold Lions are clearer, richer, smoother, and more balanced. The Gold Lions provide that lovely bloom you expect from SE 300B's.

For context, my amps are self built using the One Electron UBT-3 3K output transformer, also purchased from AES. Per the Western Electric guide for lowest distortion I'm running the tubes at 300v plate to cathode with -66v bias for 50ma idle current. Power is between 6 and 7 watts. The driver is a 6C45 with a CCS load direct coupled. Filaments are 5v dc current regulated.

Based on my limited sample, the Gold Lion Genalex 300B is a wonderful sounding tube. It's reportedly of rugged build and run conservatively as in my application I expect it to last many years. Enjoy.

- July 8th, 2020

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