12DW7 / 7247 TAD Premium Selected
Asymmetric double triode as used in old Ampegs.
Q: When does a power tube become a
Premium Selected power tube?
A: All power tubes labeled
Premium Selected have passed the following tests:
- Plate Current (PC) and Amplification (TC)
- Low Noise Test
- Microphonic Test
- Sonic Tests
- Shock Tests
- Listening Tests
- Shorts & Leakage Tests
Matching and Selecting Options for Preamp TubesMatching 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.
TAD Premium Selected/Highgrade tubes are guaranteed for a period of 6 months (according to terms of warranties)
for the quality criteria mentioned above.
RohS Compliant
