Stevie ray vaughan experimented different amps throughout his musical career. He is known as the king of tone. His musical ability and the tone we hear is the experience and the music he called texas blues.
The most frequent effects that srv just is an old ibanez TS-808 tubescremer distortion box and a cry baby wah-wah pedal. You can get the exact spec for ts9/808 at analogman.com(check this website).
The 2 most favorite amps srv used: The blackface 1967 super reverb amp and tweed 1959 bassman.(you can find any of these ressiue amps at almost any music stores.
I am also a great fan of srv and i love to play his music.
MY GEAR FOR SRV(IN PROGRESS).
Amps: 1967 blackface ressiue super reverb amp
soldano slo 100 head(overdrive and distortion)
marshall cabinet
guitar: custom made: swamp ash body, vintage modern maple neck(one truss rod) kinman avn pickups single coil(best pickups for strat).heavy strings.13'' up is what srv used. later in life, he used .10' and up or .11' up. i personally prefer .10' up. The thickness of the strings contribute a whole lot to the sound.The thicker the warmer and sustain, the lighter dull loss of sustain.
effects: TS9/808 SPEC tubescreamer 2( treble boost)
RMC 3 wah pedal
Analog fuzz face(distortion combination with wah)
Digital delay(digitech)
Flanger
I have learned that the basic step in achieving great tone is the use of less effects, a good guitar and a tube amp. I necessary do not use noise gates.
Eventhough, you have the exact gear srv used you may not able to get the exact tone . It's all in emotion, the style and so many things that come to play to achieving the tone that we call srv tone.
His style of music reflects jimi hendrix ,albert collins and many more.
:)