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12AX7 Tube Pinout

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1. Plate
2. Grid 
3. Cathode
4 & 5. Heater (usually tied together)
6. Plate
7. Grid
8. Cathode
9. Heater tap 



12AX7 PINOUT DIAGRAM     



























Substitute Data

Preferred Substitutes ......................... 12DF7 12DM7
Substitutes ........................................ 12AD7

Mechanical Data

Bulb .......................................... T-6 1/2
Base .......................................... Small Button 9-Pin
Outline ....................................... 6-2
EIA Base ...................................... 9A
Mounting Position ............................. Any

Electrical Data

Heater Voltage ................................ 6.3/12.6 V
Heater Current ................................ 0.3/0.15 A

Direct Interelectrode Capacitances (approx)

Each Triode
Input ......................................... 1.8 pf
Output ........................................ 1.9 pf
Grid to Plate ................................. 1.7 pf

Maximum Ratings (Design Center Values)

Each Triode
Plate Voltage ................................. 330 V
Plate Dissipation ............................. 1.2 W

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 250 V
Grid No. 1 Voltage ............................ -2 V
Amplification Factor .......................... 100
Plate Resistance (approx) ..................... 62.5K Ω
Transconductance .............................. 1600 µ
Plate Current ................................. 1.2




          



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The vacuum tube is, without question, an ancient electrical component. RCA sold the first tubes commercially back in 1920, almost 100 years ago! That being said, the vacuum tube is still the standard when it comes to building guitar amplifiers. As DR. Z said, "tubes have a warmth that solid state can’t match."







Hot Rod Deluxe channel switch problem 
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My friend's Hot Rod Deluxe no longer switches channels. He said when he pushed the control panel button last week, it seemed like it was switching back and forth quickly, the LED flickered with it, and then it just stayed where it stopped, which is the LED is off. The amp still works fine.....HOTROD DELUXE






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