A low noise, super low microphonic selected version of the 12AX7 that meets all specifications required for the tube to be designated 7025 and SPAX7®
The TAD 7025WB Highgrade is tested and carefully selected for the lowest noise and microphony for use in the critical first preamp stages of high-gain guitar amplifiers where noise and microphony could be an issue.
Tube Amp Doctor The 7025 WB Highgrade has a balanced tone with a slight emphasis on the upper midrange that gives a nice string attack and clarity to the sound while maintaining a strong and defined bottom end. The 7025WB Highgrade will also perform equally well in vintage guitar amplifiers.
If the 7025WB is used in sensitive phono preamps, the tube adds freshness to the signal without being harsh or pointed.
TAD 7025 Highgrade can replace any ECC83, E83CC, ECC803S, 12AX7, 12AX7A, 12AX7M, SPAX7®, 12AX7WA/WB/WC/LPS/EH, 5751, 7025, CV492 and CV4004.
DIFFERENCE from RT010 7025 and RT030 7025 / E83CC HIGHGRADE:
Compared to RT030 and RT010, RT093-HG shows slightly more edge in the upper mid-range. As a result, it asserts itself tonally very well, which makes perfect sense in a band structure.
The RT030 emphasizes the midrange a little more, thus bringing more warmth and slightly less brilliance and depth definition than the RT010 and RT093-HG.
Due to their tonal structure, the RT093-HG and RT030 are even less prone to microphonics than the RT010, which qualifies for use with extremely microphonically critical amplifiers.
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