Tube Amp Doctor - 5751 Premium - Preamplifier Tube
Low-noise tube for best clean, smooth and true vintage tone
The TAD Selected 5751 is our first choice for noticeably improved clarity, smoothness, and a true vintage tone character for most guitar amps! There will still be plenty of gain - so if you own a high-gain preamp that does not have these classic crunch characteristics, the 5751 tube will work wonders. In hi-fi preamps and CD players, the TAD selected 5751 will lower the noise floor and sound smoother and clearer than many 12AX7 tubes.
Especially this low-noise tube is recommended for best clean tone with big bottom, warm midrange and silky top end. Performs great for HiFi too! Replaces any 12AX7A/WA, ECC83, 7025 etc.
NOTE: SRV used a 5751 to improve his clean tone with vintage Fender amps producing that thick and three-dimensional bold tone.
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
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.
TAD Premium Selected/Highgrade tubes are guaranteed for a period of 6 months (according to terms of warranties) for the quality criteria mentioned above.
- Voltage (AC or DC) - 12.6V +/- 1.0 (Series), 6.3 +/- 0.5 (Parallel)
- Current - 0.175(Series), 0.375 (Parallel)
Heating - Indirect
Cathode-to-heater potential, max - 90V
Direct interelectrode capacitances, max***
- Grid to plate - 1.7pF
- Grid to cathode - 1.6pF
- Grid to heater - 1.3pF
- Plate to cathode - 0.3pF
- Operating position - Any
- Base - E9-1, small buton 9-pin
- Dimensions - 56.3mm(height), 49.2mm(seated height), 22mm(diameter)
- Cooling - Conventional
- Approximate net weight - 13g
AF Power Amplifier
- DC plate voltage - 30V
- Positive DC grid voltage - 0V
- Negative DC grid voltage - -50V
- DC cathode current - 5mA
- Plate dissipation - 1.0W
- Bulb temperature (surface hottest point) - 180 degrees celcius