While looking over a Matchless Spitfire schematic I noticed a difference in the way V1 is wired. The picture on the left is the Spitfire and the right is from a Fender Princeton. Is the Spitfire only using one-half of the 12AX7 or is it series vs parallel?
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Originally posted by jeremy View Postits wired in parallel. i have an amp my friend an i built. one 12ax7, both sides in parallel->longtail pi-> cathode biased pair of 6v6. it sounds amazing
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correct. a 12ax7 is two triodes in one glass enclosure. most of the time you use them independently. such as a typical bf fender amp, input->1st triode->volume/tone stack->2nd triode. the pins that are joined on the right diagram are the heaters (pins 4&5). for the left diagram, the heaters are also connected but so the two plates are connected, the two grids are connected, and the two cathodes are connected.
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Originally posted by jeremy View Postcorrect. a 12ax7 is two triodes in one glass enclosure. most of the time you use them independently. such as a typical bf fender amp, input->1st triode->volume/tone stack->2nd triode. the pins that are joined on the right diagram are the heaters (pins 4&5). for the left diagram, the heaters are also connected but so the two plates are connected, the two grids are connected, and the two cathodes are connected.
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not sure. my amp only has volume and tone. how did matchless do it on the spitfire? a buddy of mine has an old one and its a great little screamer of an amp. i know matchless used a parallel wired 12ax7 on the chieftain and mojave did it on the coyote too if i recall
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