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Tube Option

eru

Member
Messages
717
Self-biased SE A amp, so don't yell at me about biasing.

what exactly is involved in changing preamp/poweramp tube types (stock is 12ax7/el84) and what kind of variety is actually an option?
 

rockon1

Platinum Supporting Member
Messages
13,228
Self-biased SE A amp, so don't yell at me about biasing.

what exactly is involved in changing preamp/poweramp tube types (stock is 12ax7/el84) and what kind of variety is actually an option?

As far as pre amp tubes use can try 5751's,12AT7's 12AY7's,12AV7's,12Au7's(in order of gain reduction) no problem. Bob
 

drbob1

Gold Supporting Member
Messages
28,327
Quick summary: any 12A_ tube (12AX7, 12AY7, 12AU7, 12AZ7, 12AT7) and their military derivatives (you have to check a tube compatibility list, I can only remember the 5651, 7025 off hand). No real substitute for the power tubes, the 7819 is just a military EL84, not significantly different... If you're handy and can rewire the socket for octal preamp tubes (and if the PT can handle the voltage and the OT is somewhere in the ballpark for output resistance) you can open up a lot of possibilities...
 

rockon1

Platinum Supporting Member
Messages
13,228
Quick summary: any 12A_ tube (12AX7, 12AY7, 12AU7, 12AZ7, 12AT7) and their military derivatives (you have to check a tube compatibility list, I can only remember the 5651, 7025 off hand). No real substitute for the power tubes, the 7819 is just a military EL84, not significantly different... If you're handy and can rewire the socket for octal preamp tubes (and if the PT can handle the voltage and the OT is somewhere in the ballpark for output resistance) you can open up a lot of possibilities...

Yeah I left out some equivelents... 6072(12AY7),6021(12AT7)6681(12AX7) 7025(low noise 12AX7), 7247(12DW7)5965(12AV7)5963,6189(12AU7)
Bob
 

eru

Member
Messages
717
Thanks, guys.

I finally put in a 12AT7 today and it made a big difference. I was trying to find a 12AU7, but I don't think I need it.

Between this and the RC Booster out front that really adds something nice to the clean tone, the speaker/cab is by far the weak point of my rig and will probably be the thing upgraded next.

-eru
 




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