[DIY pedal] Replace 12AU7 with 9AU7 ?? - diyAudio
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Old 23rd October 2012, 02:05 PM   #1
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Default [DIY pedal] Replace 12AU7 with 9AU7 ??

I'm going to implement matsumin valvecaster like this.
But 12AU7 is much expensive than 9AU7.
Can I replace it with 9AU7?
BTW, any suggestion for putting a tube inside a pedal?
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Old 23rd October 2012, 02:11 PM   #2
TheGimp is offline TheGimp  United States
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You would need to drop the heater voltage from 12.6V to 9V. Be aware the 9V version pulls more current to achieve the same wattage in the heater as the 12.6V version.

What are you going to power it with?
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Old 23rd October 2012, 03:16 PM   #3
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Of course, I power it with 9V DC adapter. But I'll try to power it with a battery if the battery can supply large current.
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Old 23rd October 2012, 03:45 PM   #4
TheGimp is offline TheGimp  United States
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The 9AU7 will take 225mA of current for the heater alone. batteries won't last long unless you use something like 1500mA/Hr Li-ion batteries.

The DC adapter is probably the best solution.

I believe that ost pedals have the tubs horizontally mounted.
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Old 23rd October 2012, 04:28 PM   #5
kevinkr is offline kevinkr  United States
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All musical instrument related threads belong in Instruments and Amplifiers. Relocated to the correct forum.

PLEASE SEE:
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Tubes / Valves All about our sweet vacuum tubes Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum
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Instruments and Amps Everything that makes music, Especially including instrument amps.
These sub-headers are located at the top of the respective forum. Thanks..
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Old 24th October 2012, 02:10 PM   #6
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Roger that!
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Old 24th October 2012, 02:16 PM   #7
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Default It's originally powered in 9V

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Originally Posted by TheGimp View Post
You would need to drop the heater voltage from 12.6V to 9V. Be aware the 9V version pulls more current to achieve the same wattage in the heater as the 12.6V version.
The schematic is originally powered in 9V which means that I don't have to change the voltage, is that right?
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