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East-West Guitars

Tube Amp Doctor 7025/E83CC ‘Redbase’, Highgrade, Premium Selected


9 in stock


The all new TAD 7025 / E83CC REDBASE HIGHGRADE Selection – Powerful Gain, Warm and Airy Tone and Zero Microphony

PREMIUM HIGHGRADE selected quality for the most demanding amp stages. This tube works greatly for warm clean tones and creamy overdrive. We recommend this tube for the 1st gain stage and as input tube for all applications. It upgrades any 12AX7A and ECC83 tubes and replaces E83CC tubes.

This HIGHGRADE Selection is the tip-of-the-top quality at the lowest noise (microphony, hum, hiss) level. Typically only 2-5% out of the whole production of this tube meets the HIGHGRADE requirements.

Fine, unobtrusive highs, complex, dense mids and clear real bass. Selected for demanding applications for maximum smoothness and zero microphonics – even with very sensitive input stages of high-gain amplifiers.
Ideally suited and our clear recommendation for the 1st gain stage of guitar amps, headphone amps, tube microphones and for the extremely sensitive phono preamp-stages of audio amplifiers.

In terms of sound, this TAD 7025 / E83CC REDBASE® stands for maximum transparency and depth definition and puts an end to musty or sappy highs. Airy, silky highs combined with tight but by no means overemphasised bass are the hallmarks of this 7025 HIGHGRADE.
Thus the TAD 7025 / E83CC REDBASE® as V1+V2 ideally supports the traditional Fender® sound and also brings more liveliness and brilliance to an AC30®. It’s clear that these characteristics also bring any Boogie® or Marshall® to the fore.

The TAD 7025 / E83CC REDBASE® can replace any ECC83, E83CC, ECC803S, 12AX7, 12AX7A, 12AX7M, 12AX7WA/WB/WC/LPS/EH, 5751, 7025, CV492 and CV4004. Also replaces the MESA® SPAX7-A

DISTINCTION from RT093-HG 7025WB and RT030 7025 / E83CC HIGHGRADE:
Compared to the RT030 and RT093-HG, the RT-7025 has a smoother overall response and better linearity qualifying for natural clean tones and relaxed HiFi audio listening. The RT093-HG shows a little more edge in the high-mid range. As a result, it asserts itself tonally very well, which might make perfect sense in a band structure.
RT030 is emphasising the midrange a bit more and thus brings more warmth and a little less brilliance and depth definition than the RT-7025 and RT093-HG.
The RT-7025 has the lowest microphony of these 3 which might be especially important for use in tube microphones, audio system input stages and as input stage tube in any guitar amplifier.


Q: When does a preamp tube become a Premium Selected tube?

A: All preamp tubes labeled Premium Selected have passed the following tests:
– Low Noise Test
– Microphonic Test
– Gain Test
– Sonic Tests
– Shock Tests
– Listening Tests
– Balanced Output Test

But only those tubes which pass these tests best are labeled Highgrades. Typically this is approx. 3-10% from a production batch that qualifies for the HIGHGRADE rating from TAD.
Due to the very high selection requirements, this article is temporarily only available to a limited extent! Please note our shop-information on availability.

Matching and Selecting Options for Preamp Tubes
Matching in Pairs for preamp tubes means that two tubes show identical gain, hence, four characteristically identical systems.
This matching method includes our Balance-Selection. We highly recommend this matching method for hi-fi systems and all stereo applications.

TAD Premium Selected/Highgrade tubes are guaranteed for a period of 6 months (according to terms of warranties)
for the quality criteria mentioned above.
Tube Type: 12AX7/ECC83/7025
Socket: 9 Pin(Noval)
Selection: Highgrade

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