![]() Let us talk about one of our most precious collector amps the “Texas Flood Vibroverb amp”. Finally we point out location of components in the physical layout diagram. We usually start with explaining a mod from a functional perspective where we relate to components in the logical schematics diagram. ![]() You’ll need schematics to implement some of these mods. We are not saying you will be happy with the tone or be able to play anything like Stevie, but there are a couple of key learning points in doing what Cesar Diaz did. ![]() If you want to increase the clean headroom and do all the tricks Cesar Diaz did, Stevie Ray Vaughan’s guitar tech, we will try to explain all of this. If you also invest in implementing the tremolo disconnect mod, you can really make the Vibroverb break up at practise volumes. Tube mods (pulling V1 out and a 12ax7 PI) will take you a long way. Many of the mods described below will make your amp break up earlier and reach the sweet spot at a lower volume. Of course this is a matter of taste, but a guitar tone with strong mids will contribute to a rich overall melodic footprint in an electrical band. It will not interfer with the bass like a 4×10″ setup does. The mids will blend in nicely with the bass, drums, piano and horns. Mid frequencies is exactly what you need on stage in an electrical band. The 15″ speakers are firm in the bass and have lots of sparkle but most importantly, they have an enormous spread carrying the lower mids to anyone on stage. The Vibroverb did score among steel guitar players at the time. Players probably thought the amp was suited for bass amps, we’re not sure. The Vibroverb did not sell very well in 64 and 65. It is powerful and loud, but in a different way than the 10″ and 12″-amps. The Vibroverb belongs to the 6L6 Fender family. In fact, there aren’t any different features or technical improvements in the Vibroverb that justifies its popularity. Beside the speaker the blackface Vibroverb is very similar to the other blackface and silverface AB763 Fender amps. While most guitar amps have multiple 10″ and 12″ speakers the Vibroverb came with a big Jensen C15n or a JBLd130f, the last one with a huge magnet, aluminium dust cap and flat speaker cone that can be hard to tame in terms of treble, punch and attack. So, what is so special with the Vibroverb? First, the 15″ speaker sets it apart from most guitar amps. Given the hype and popularity, these few Vibroverbs are extremly valuable and collectable. Since Fender did not continue the Vibroverb after the CBS takeover in 1965, most likely because players didn’t desire 1×15″ amps at that time, there are only a few blackface Vibroverb amps out there. See our SRV page for more information about Stevie’s tone. Though the Vibroverb is closely associated with SRV you can reproduce his tone with most Fender amps given the right speakers. ![]() Because of him the Vibroverb has become the most expensive and sought after blackface amp on the vintage amp market. Stevie Ray Vaughan’s musical influence has really hyped the blackface Fender Vibroverb. V4 12ax7 = 1/2 Reverb recovery and 1/2 gain stage for vibrato channel.AA763/AB763 Tube layout (Seen from behind, V1 is to the right side)
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