Help understanding tube position in amps..

[billyg121]

I know pretty much nothing about this...the way preamp tubes positions are labeled in amps. V1, V2, etc. Are the standard names? Do they mean the same for different amps..as far as what they do? Thanks for any info.

[Evansexcellent]

http://proguitarshop.com/andyscorner...1-preamp-tube/
This should help a little.

[Sean French]

V1 is the first pre-amp tube that is usually located closest to the amp' input.
Next tube is V2 etc, etc.
V1 being the first gain stage of an amp.

[BCJek]

The topology of most amps is similar, but not the same. A V1 that is a 12AX7 is usually the first TWO gain stages of an amp, as it is a twin triode - two halves in one glass envelope. If you look at amp schematics, the two halves of the tube are typically named V1a and V1b.

Don't forget paralleled triodes at input - the two halves of a 12AX7 in parallel.

[BCJek]

In the schematic below, V1a is the first gain stage, the other half of the same tube is the second gain stage, V1b. Both halves of V2 are used as a phase inverter, and V3 and V4 are the output tubes, in push-pull configuration.

[billyg121]

Very cool. Thanks for the info. Also, does the V actually mean something in tube jargon? And , typically does the input stage have the most impact on tone?

[Sean French]

Originally Posted by billyg121

Very cool. Thanks for the info. Also, does the V actually mean something in tube jargon? And , typically does the input stage have the most impact on tone?

I think V stands for valve.
Yes, V1 typically has the most tonal impact of the pre-amp.

[CharlyG]

V for Valve. You can tell which tudes are which in a guitar amp easily. The two big tubes that are together are the power tubes. Next to it is the phase inverter (12AX7), the next tubes are the preamp, V1 typically furthest away from the power tubes. If there is another big tube, it is the rectifier. If there is a 12AX7 size socket not in the row of the others, it usually is the reverb tube.

[smolder]

check this out:

http://www.kcanostubes.com/content/f...ecommendations