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Old 26th July 2006, 12:20 AM   #1
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Default 12ax7a replacement

Hi, I have loooooot of tubes, but I couldnt find 2x 12ax7a for my bass preamp (Bass guitar preamp)

What tube can I use for replacement?

there are some examples of what I have but dont know if I can use them.

6x ECL82
4x 6AQ5
2x 12au7
2x EF86
3x 6B6A
2x 6CG7
2x 6BZ6
2X 6CB6
2x 12BA6
5x 12AV6

thanks!!!
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Old 26th July 2006, 02:19 PM   #2
KBK is offline KBK  Canada
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12ax7a, 12DF7, 12DT7, 7025*, 7025a*, 12AD7 (filament issues possible), 12AU7 (in a pinch, may not work), 12AU7a (same warning), 12bZ7 (filament), 12DM7(filament).

*=exact replacement-cross

Then the Euro equivalent numbers for a true 12AX7 cross. ECC83*, CV492*, E83CC*, etc.

There is also a Russian one out there, can't quite remember right now.

Depending on how the heaters are powered in the circuit, other crosses are 'potentially' possible.

Be it known, though, that 12ax7's are common as grass and as cheap as it gets. Best to buy the proper tube.
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Old 26th July 2006, 02:23 PM   #3
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Quote:
Originally posted by KBK
12ax7a, 12DF7, 12DT7, 7025*, 7025a*, 12AD7 (filament issues possible), 12AU7 (in a pinch, may not work), 12AU7a (same warning), 12bZ7 (filament), 12DM7(filament).

*=exact replacement-cross

Then the Euro equivalent numbers for a true 12AX7 cross. ECC83*, CV492*, E83CC*, etc.

There is also a Russian one out there, can't quite remember right now.

Depending on how the heaters are powered in the circuit, other crosses are 'potentially' possible.

Be it known, though, that 12ax7's are common as grass and as cheap as it gets. Best to buy the proper tube.
thanks you a lot!!!!!11

I found a place that still sells 12ax7a at u$s11, I will buy them today!!

thanks again!
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Old 26th July 2006, 03:44 PM   #4
Giaime is offline Giaime  Italy
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Quote:
Originally posted by KBK
There is also a Russian one out there, can't quite remember right now.
Hello KBK,

you're refering to 6N2P - 6SS41. But beware heater is different than 12AX7.

http://www.giaime.altervista.org/china_eng.html
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Old 26th July 2006, 04:28 PM   #5
Sheldon is offline Sheldon  United States
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5751 has slightly lower gain specs., but it's close enough to work well in virtually any circuit that calls for a 12AX7.
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Old 27th July 2006, 06:45 AM   #6
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The 12AV6 double diode triode is regarded by some to be 1/2 12AX7 plus a couple of diodes, and as such, could be used in the circuit you are making. Provided, you allow for the12v heaters, the extra heater current needed, B7G not B9A sockets required, and double the amount of sockets needed.( single not double triodes).
All in all more work..... But if you're desperate.
Dont forget to tie the diodes to ground.

thyratron
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Old 27th July 2006, 12:37 PM   #7
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Thanks for the replies!!

I found a place that sells 12ax7 and i bougth 2 brand-new 12AX7 so there is no need to use remplacements.

thanks again!!

Jorge.
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Old 27th July 2006, 01:26 PM   #8
Ryssen is offline Ryssen  Sweden
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Is ECC803 an ekvalent?
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Regards Åke
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