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Alpha 250 kOhm linear

Description

Panel Mount Potentiometer

Sicherheitsinformation

Safety Information for Electrical Components, Especially for Tube Amplifiers

For all electrical, electromechanical, and mechanical components, the specifications and operating parameters defined by the respective type standards generally apply.
Further information, where available, can be found in the respective data sheets and product descriptions included with the product.

General Information

NOT SUITABLE FOR CHILDREN – choking hazard due to small parts
NOT SUITABLE FOR UNTRAINED PERSONS – danger to life due to high voltages
The safety and processing requirements applicable to the component must be observed
CE conformity applies only when installed professionally
Warranty becomes void in case of improper handling
The operator is responsible for proper installation
Local regulations and VDE provisions must be complied with
Never exceed the rated power
Never exceed the rated voltages and currents

Required Expertise

Use of measuring instruments (multimeter, oscilloscope) and evaluation of measurement results
Safe handling of high voltages (up to 500V and more)
Reading and understanding circuit diagrams
Selection of appropriate tools
Knowledge of electrical components and their characteristics
First-aid knowledge for electrical accidents
Knowledge of VDE regulations and safety requirements

Specific Safety Instructions by Component Groups

Amplifier Tubes

Hazard due to high voltages
Hazard due to very high heat generation
Hazard due to glass breakage
Hazard due to UV radiation in case of defective tubes

Transformers & Chokes
For qualified personnel only! Installation and removal of power transformers, chokes, output transformers, and switching power supplies may only be carried out by qualified specialists.

Hazard due to high voltages
Risk of electric shock
Hazard due to heavy weight
Risk of injury
Fire hazard in case of overload

Capacitors

Explosion hazard if electrolytic capacitors are connected with incorrect polarity
Never exceed the rated operating voltage
Hazard due to high voltages
Risk of electric shock
Capacitors can store voltage for hours

Resistors

Hazard due to high heat generation
Hazard due to high voltages
Fire hazard in case of overload
Hazard due to hot surfaces
Risk of burns

Fuses

Replace only with identical ratings
Never bypass or "repair" a fuse
Identify the cause of fuse failure before replacement
Fire hazard when using incorrect fuse ratings

Relays & Switches

Hazard due to switching sparks
Contact damage in case of overload
Fire hazard due to defective contacts

Potentiometers & Rotary Switches

Hazard due to high voltages at the contacts
Fire hazard in case of overload
Mechanical damage may lead to short circuits

Diodes & Rectifiers

Hazard due to high voltages
Heat generation
Risk of burns
Observe correct polarity
Malfunction in case of incorrect polarity
Heat sinks required for power diodes

Sockets, Connectors & Cables

Hazard due to high voltages
Check insulation for damage
Ensure proper strain relief
Fire hazard due to undersized cables
Touch protection required for high-voltage connectors

Heat Sinks & Fans

Risk of burns due to hot surfaces
Risk of mechanical injury from moving fans
Electrical hazard in case of defective fan motors

Circuit Boards & Turret/Lug Terminals

Hazard due to sharp edges
Fire hazard during soldering
Hazard due to solder fumes
Adequate ventilation required
Observe ESD protection

Housing Parts & Mounting Hardware

Risk of injury due to sharp edges
Electrical safety must be ensured
Observe proper grounding
Provide adequate ventilation openings
Ensure protection against contact with live parts

Measuring Instruments & Indicators

Hazard due to high voltages in analog instruments
Fragile glass front
Risk of injury

Documents

Alpha 24mm RV Series (637.95 KB)

Manufacturer

EU-Wirtschaftsakteur | EU Economic Operator
Tube-Town GmbH, Rumbergring 37, 66969 Lemberg, Germany, info@tube-town.de

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Electrical Characteristics

Total Resistance Tolerance: +/- 20%
Rated Power
- B/Lin Taper: 0,125 W
- A/Log Taper: 0,1 W
Max. Operating Voltage
- B/Lin Taper: 150 V AC
- A/Log Taper: 150V AC
Noise: 47 mV max.
Insulation Resistance: 500 V DC 1000MOhm
Withstand Voltage: 1 minute 500 V AC
Rotational Life: 15000 Cycles

Mechanical Characteristics

Shaft Diameter 6 mm
Shaft Type: Split Shaft
Shaft Length: ca. 9 mm
Bushing Length: 6,5 mm
Body Diameter: 16 mm
Connectors: Solder Lugs
Total Rotational Angle: 300° +/- 5°
Rotational Torque: 30~200gf.cm
Solder Heat Resistance: 300°C, 3 S

Material

Shaft: Cast Iron (Aluminium Zinc)
Bushing Material: Cast Iron

0,75 €

TT 12AT7 / ECC81

Warm and balanced overall sound, paired with high resolution and brilliance, which is why the TT12AT7 achieves the best results in both instrumental and audio/high-end amplifiers.

Features:

Warm and balanced sound
Excellent sound resolution and brilliance
Ideal for instrumental and audio/high-end amplifiers

Hint;
Often, 12AU7 and 12AT7 types are used instead of 12AX7 tubes in order to either reduce the overall power of the amplifier or just take back the overdrive of the preamp. Especially the 12AU7 brings a very large tonal difference compared to a 12AX7, which is usually much greater than when switching from a 12AX7 to 5751 or 12AT7.

When using a 12AU7 in a driver stage that is normally designed for 12AX7, the overall power of the power amp is usually reduced. How big this difference is depends on the amplifier or circuit. For example, a Marshall with a 12AX7 in the phase inverter stage set to volume 5 will then reach the same volume with a 12AU7 set to volume 6 (perceived volume, not measured).

Electrical Characteristics

Heater Voltage (Uf): 6.3V or 12.6V
Heater Current (If): 300mA at 6.3V, 150mA at 12.6V
Anode Voltage (Ua): Maximum 300V
Grid Voltage (Ug1): -2V (typical)
Anode Current (Ia): 10mA (typical)
Anode Power Dissipation: Maximum 2.5W per triode
Anode Resistance (ra): 11kΩ
Amplification Factor (μ): 60
Transconductance (S): 5.5mA/V
Input Capacitance (Cin): 1.6pF
Output Capacitance (Cout): 1.6pF

Mechanical Characteristics

Socket: B9A (Noval)
Number of Pins: 9

Pin Configuration

1 Anode (Triode 1)
2 Grid (Triode 1)
3 Cathode (Triode 1)
4 Heater (f)
5 Heater (f)
6 Anode (Triode 2)
7 Grid (Triode 2)
8 Cathode (Triode 2)
9 Center Heater (f)

Application Notes

Heater Operation: The tube can be operated with either 6.3V or 12.6V, depending on the circuit design.
Grid Resistors: It is recommended to use grid resistors of at least 1MΩ to ensure stable operation.
Coupling Capacitors: Capacitors with low capacitance (typically 0.1µF) are recommended to minimize high frequency disturbances.

16,90 €