Vacuum Tube - PX300B, Genalex Gold Lion, Gold Pin

Vacuum Tube - PX300B, Genalex Gold Lion, Gold Pin

Genalex
Vacuum Tube - PX300B, Genalex Gold Lion, Gold Pin image 1
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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."
Starting at: $192.30
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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.

SKU:
T-PX300B-GOLD-GEN
Item ID:
039551
Brand:
Genalex
Part Numbers
Single or MatchedOur Part NumberUPC/EAN
SingleT-PX300B-GOLD-GEN841358102660
Matched PairT-PX300B-GOLD-GEN-MP841358102677
Matched QuadT-PX300B-GOLD-GEN-MQ841358102684
Product Measurements by Type
Amplification Factor3.85
Bulb Temperature250°C
Capacitance, Grid to Filament9 pF
Capacitance, Plate to Filament4.3 pF
Capacitance, grid to plate15 pF
Cathode Current (Ik)100 mA
Grid Circuit Resistance (Rg), Fixed Bias50 kΩ
Grid Circuit Resistance (Rg), Self Bias0.5 MΩ
Heater Current1.25 A
Heater Voltage5.0 V
Plate Dissipation (Wa)40 W
Plate Resistance (Ra)700 Ω
Plate Voltage (Ua)≤ 450 V
Transconductance (S)5.5 mA/V
Packaging Information
Packaging DimensionsMatched Pair versionT-PX300B-GOLD-GEN-MP7 in. × 5.28 in. × 2.67 in.
Matched Quad versionT-PX300B-GOLD-GEN-MQ7 in. × 5.38 in. × 5.28 in.
Single versionT-PX300B-GOLD-GEN7 in. × 2.75 in. × 2.75 in.
Weight (Packaging)Matched Pair versionT-PX300B-GOLD-GEN-MP2.738 lbs.
Matched Quad versionT-PX300B-GOLD-GEN-MQ5.476 lbs.
Single versionT-PX300B-GOLD-GEN0.349 lbs.
Product Measurements by Item
T-PX300B-GOLD-GEN-MP - Matched Pair versionAmplification Factor3.85
Bulb Temperature250°C
Capacitance, Grid to Filament9 pF
Capacitance, Plate to Filament4.3 pF
Capacitance, grid to plate15 pF
Cathode Current (Ik)100 mA
Grid Circuit Resistance (Rg), Fixed Bias50 kΩ
Grid Circuit Resistance (Rg), Self Bias0.5 MΩ
Heater Current1.25 A
Heater Voltage5.0 V
Plate Dissipation (Wa)40 W
Plate Resistance (Ra)700 Ω
Plate Voltage (Ua)≤ 450 V
Transconductance (S)5.5 mA/V
T-PX300B-GOLD-GEN-MQ - Matched Quad versionAmplification Factor3.85
Bulb Temperature250°C
Capacitance, Grid to Filament9 pF
Capacitance, Plate to Filament4.3 pF
Capacitance, grid to plate15 pF
Cathode Current (Ik)100 mA
Grid Circuit Resistance (Rg), Fixed Bias50 kΩ
Grid Circuit Resistance (Rg), Self Bias0.5 MΩ
Heater Current1.25 A
Heater Voltage5.0 V
Plate Dissipation (Wa)40 W
Plate Resistance (Ra)700 Ω
Plate Voltage (Ua)≤ 450 V
Transconductance (S)5.5 mA/V
T-PX300B-GOLD-GEN - Single versionAmplification Factor3.85
Bulb Temperature250°C
Capacitance, Grid to Filament9 pF
Capacitance, Plate to Filament4.3 pF
Capacitance, grid to plate15 pF
Cathode Current (Ik)100 mA
Grid Circuit Resistance (Rg), Fixed Bias50 kΩ
Grid Circuit Resistance (Rg), Self Bias0.5 MΩ
Heater Current1.25 A
Heater Voltage5.0 V
Plate Dissipation (Wa)40 W
Plate Resistance (Ra)700 Ω
Plate Voltage (Ua)≤ 450 V
Transconductance (S)5.5 mA/V

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet525.63 KB

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Product Reviews

5.00 out of 5 based on 2 reviews
David P - September 16th, 2021
5 out of 5

Bought these to initially have as a backup since my current 300's were 10+ years old. The positive of this tube is that it does sound good. Punchy low end, clean mids and airy top end. The very unfortunate thing is that the set barely lasted 7 months. Heaters failed on both tubes within weeks of one another. Put the 10+ year old tubes back in with no problems. Too bad the Genelex were just not reliable.

Paul Spiegel - July 8th, 2020
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.