In ‘theory’ you’ll get a bit lower noise and lower hum with a 7025. Difference Between ECC (7025 vs 12AX7) The ECC83 (12AX7) ValveĪ common question is “What is the difference between a 7025 Valve and an ECC83 valve?” You can put 12V across both heaters, or 6V across the individual heaters and ground the centre tap. So on the 7025 (ECC83) valve they put the heaters in series and bring out the two ends and a centre tap. But each valve also has a heater, so that would need another 4 pins. How on earth do they pack all that into one 9-pin envelope! 6 pins are taken up by the cathodes, anodes and grids. ‘Triode’ – the ‘ode’ part refers to electrode.The gain is about x 100 although in practice a workable gain of 60 is achievable. ‘High Gain’ – well, that speaks for itself.‘Dual’ – there are two valves in the one glass envelope.In technical terms, the 7025 valve is a “dual high gain triode”. The reason the 7025 valve is used so much is because it’s actually two identical valves in one envelope! So designers can get two gain stages using just one 7025 valve.
They are a significant upgrade to the valves that come with many amplifiers. We sell the Electro Harmonix and Sovtek 7025 valves, both of which will guarantee superb tone and performance. It is one of the few small-signal vacuum tubes in continuous production since it was introduced. Because it provides two handy amplifiers in one miniature glass envelope, the 7025 is still a much used and popular valve. It was developed around 1946 by RCA engineers and was released for sale as the 7025 shortly after. The RCA 7025 Valve is a 9-pin preamplifier valve with two identical triodes both of which have a high voltage gain. On many amplifiers, particularly Fender, the 7025 is the specified valve to ensure best performance. The 7025 valve is a low hum and low noise version of the ECC83, but will you hear the difference? 99% of valve amplifier manufacturers use the ECC83 (12AX7) as the first preamplifier valve but purists and professionals love to use the 7025 instead. The short answer is yes in that you can swap a 7025 valve for an ECC83 and your amplifier will work fine.
The 7025 Valve v ECC83 One question we are often asked is this: Is the ECC83 equivalent to the 7025 valve?
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