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5150ii 12AX7 functions?

 
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samikaze



Joined: 30 Jul 2005
Posts: 2

PostPosted: Sat Jul 30, 2005 3:45 pm    Post subject: 5150ii 12AX7 functions? Reply with quote

Hi, before I replace the preamp tubes in my 5150ii, does anyone know the functions of each tube from left to right?

This will help me select the tubes for the gain stages, clean stages, and if there's a phase inverter

I would guess V1 would most likely be gain stages 1 and 2 for both channels??

Thanks in advance for replying!
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samikaze



Joined: 30 Jul 2005
Posts: 2

PostPosted: Sat Jul 30, 2005 8:38 pm    Post subject: Reply with quote

found the answer. thanks
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gto1968



Joined: 23 Dec 2008
Posts: 6

PostPosted: Wed Dec 24, 2008 1:28 am    Post subject: Reply with quote

Please share your info, Is V1 the phase inverter?
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Pete
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drolaw



Joined: 29 Sep 2008
Posts: 56
Location: San Antonio, TX

PostPosted: Fri Dec 26, 2008 8:42 pm    Post subject: Reply with quote

V1 which should be next to the power tubes is the PI..I think. Maybe I can find a schematic somewhere. If I find it I'll post it here.
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drolaw



Joined: 29 Sep 2008
Posts: 56
Location: San Antonio, TX

PostPosted: Fri Dec 26, 2008 8:50 pm    Post subject: Reply with quote

Here you go

found it here:

http://www.fjamods.com/5150Models.html

In order:

Power tubes, V4, V3, V5, V2, V1, V6

V4 is the PI.

5150II/6505+ Signal Path

Clean and Crunch uses

V1 (one half)
V6
V3
V4
Power Tubes



Lead channel uses

V1
V2
V5
V3
V4
Power Tubes
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gto1968



Joined: 23 Dec 2008
Posts: 6

PostPosted: Sat Dec 27, 2008 12:46 am    Post subject: Reply with quote

Thanks for the info!
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Pete
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