12AX7A-C / ECC83 TAD Premium Selected (~ 7025, 12AX7WA, E83CC)
Perfect V2+ Preamp Tube - Good Gain - Tight Deep Bass - Fat Mid-range!!
Very good gain, tight deep bass, fat mids and silky top end with overall definition and brightness. Selected with balanced systems and recommended for guitar amps to improve overall response.
Best for clean tones as well as for sounds requiring deep-bass power like any modern preamp. Recommended for all positions in amps with medium gain level or High-Gain Amps for V2+ positions.
As for V1 in general, but especially for higher gain amps or phono/audio-amps, we recommend the RT010 7025 Highgrade or the RT030 E83CC/7025 Highgrade.
The TAD 12AX7A-C can replace any 7025, 12AX7WA, 12AX7WB, 12AX7LPS, 12AX7EH, ECC83 or E83CC.
1st choice for: Boogie®, Brunetti®, Diezel® , Engl®, Fender®, Hughes & Kettner®, Koch®, Laney®, Marshall®, Soldano®, Trace Elliot® and so many more.
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
TAD does all TAD Tube
quality control processing in-house under strict control of their technical
staff. Their techs which are also musicians and guitar players, developed and
constructed their custom tube testing systems and aging rigs to run tubes in
real amplifier circuits and operation conditions.
For TAD, real tube
quality control is way more than just a simple test. Before a TAD Tube gets
accepted at all the techs perform extensive sample evaluation testing for
consistency, power test, shock resistance test, soak test (long term operation
at full power) and of course a musical test in known amplifiers to learn about
its sound character in different styles. The main tests are made after a proper
pre-aging to stabilize the cathode emission. While most tube test equipment
does work at 250V as a maximum TAD built their test rig to operate at voltages
of 360 to 600V depending on the tubes being tested. Every TAD Tube is tested by
their qualified staff. Each pentode is inspected and tapped while operating and
listened for noise floor, hum and odd noise.
Finally measured for a
set of parameters and matched by Ia (PC) and Gm (TC). TAD tests batches of 400
to 500 pieces per run to allow tightest tolerances of typically 0.5mA for PC.
All TAD Tubes and boxes get labeled with the PC and TC test results and a
unique serial number to identify every tube they’ve ever tested. TAD techs
permanently verify and monitor selected and matched TAD Tubes by using them
every day in their own amp service department and in the TAD Amp Kits they
assemble. This is the most complete quality control system they can imagine.