Emission Labs PX25 Rør - Parret par/2 stk.

The PX25 is one of the all time classic audio output triodes. Designed in England in 1932, it was the first tube, designed for larger output power.

Guarantee program for first owner.

The first owner can register the tube within 4 weeks after receival, at the Emission Labs website, to participate in the 5 years guarantee program, which is additional to the legal obligations of the seller.

Features

• Gold Plated Grid (Note8)
• Soft rubber suspended tube base
• Hard metal Construction (Note1)
• Extra large getters
• Hand blown Glass bulb
• Anti-microphonic Anode- and grid suspension
• These tubes are shipped in a high quality dual box
• Tube printing with 24k gold, and red color burned into the glass
• Gold Plated, black ceramic socket.

The Character of the EML PX25

The PX25 is one of the all time classic audio output triodes. Designed in England in 1932, it was the first tube, designed for larger output power. In the old Marconi Numbering System, P stands for 4V heater, and X stands for Power Tube. In Japan, 4Volt heater tubes have always been more preferred for their sound. Moreover, PX25 is a tube with higher gain, it is around 9x unloaded, which is more than twice as much as 300B. This makes driver circuit easier, and PX25 needs less than 30V RMS signal on the grid, for full output signal. The higher gain of PX25 was achieved by Marconi, by increasing the plate distance. We did the same.

Sound of the PX25

We need to understand the design principle of the PX25 tube. This is a tube with much larger plate distance as usual. We just adopted this from the vintage designs. The larger distance will catch your eye immediately, when looking inside the bulb. Not only will this make the glow picture nicer. Also the higher anode distance results in higher gain, and higher plate impedance. Which is what PX25 sound is about. Generally speaking such tubes have a more silkier sound, and a tendency to develop best efficiency at somewhat higher plate voltage. As with all higher gain tubes, there is a higher influence of the tube itself, to the final sound. For the same reason, a good quality transformer is needed, and a good quality PX25 tube is needed, with original specifications. When these factors come together, sound becomes as intended by it's designers, now almost 100 years ago.

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