Vacuum Tube - 12BH7A-STR, Tube Amp Doctor, Premium Selected

Tube Amp Doctor (TAD)
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Vacuum Tube - 12BH7A-STR, Tube Amp Doctor, Premium Selected

In Stock
Quantity in stock: 79

Maximum of Reliability - Outstanding Tonal Quality!

The all-new TAD 12BH7A-STR combines the best sonic and mechanical performance of the NOS RCA black plate with advantages of the GE version. A maximum of reliability with outstanding tonal quality makes the new balanced selected TAD 12BH7A-STR the first choice for Ampeg SVTs, the Blackstar HT-5 and high-end applications.

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

Item ID:
Tube Amp Doctor Part Number:
Tube Amp Doctor (TAD)
Product Measurements by Type
Amplification Factor, Class A17
Body Height66 mm
Cathode Bias Resistance1 MΩ
Cathode Current (Ik)20 mA
Cathode to Heater Voltage≤ 100 V
D.C. Grid Voltage, negative-50 V
D.C. Grid Voltage, positive, AF Power Amp0 V
D.C. Plate Voltage, AF Power Amplifier330 V
D.C. Plate Voltage, Class A250 V
D.C.Plate Voltage On Vertical Deflection Amplifier500 V
Fixed Bias Resistor250 kΩ
Grid Voltage, class A (Ug)-10.5 V
Grid to Cathode Capacitance (cg/k)2.9 pF
Grid to Heater Capacitance (cg/h)2.9 pF
Grid to Plate Capacitance (ca/g)2.5 pF
Heater Current0.3 / 0.6 A
Heater Voltage6.3 / 12.6 V
Item Diameter22.5 mm
Item Height73 mm
Plate Current, class A (Ia)11 mA
Plate Dissipation, AF power amplifier (Wa)3.5 W
Plate Resistance, class A (Ra)5.4 kΩ
Plate to Cathode Capacitance0.5 pF
Transconductance, Class A (S)3.1 mA/V
Packaging Information
Packaging Dimensions0.878 in. × 0.878 in. × 2.688 in.
Weight (Packaging)0.04 lbs.

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PDF: Specification Sheet Specification Sheet320.48 KB

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