There was plenty of clean headroom with the stock “AB763” tube configuration (12AT7 phase inverter and GZ34 rectifier) for funky chords and stingin’ clean notes at volume between 3 and 4.
If we wanted to get more breakup from the amp for some raw blues tones and keep he same volume, we did the following: Playing the amp around volume 5 and 6 gives a raw, unfiltered texas blues tone out of the single 10″ Weber 10A150.
Speakers The blackface and silverface Vibrolux came with several different production speakers; Blackface amps had Jensen C10q (1,25″), C10ns (1,5″) or Oxford 10L5 while the silverfaces could have Oxford 10L5 or CTS ceramic.
Having played all of these speakers our favorites are, not surprisingly, the Jensen and CTS speakers.
The 2×10″ speaker configuration with open back cabinet is convenient, efficient and powerful “enough” for us.
Sonically, it offers everything we look for in a Fender amp; A dynamic and sensitive touch, brightness, volume, ambience, spread and a decent weight.
It was loaded with one Weber 10A150 and one Jensen C10q delivering together a decent, loud clean sound and with firm lows.
The speakers we chose were Weber 12F150 12″ and a Jensen Jet series Tornado 10″.From a player’s perspective, you’ll get more value for the buck with a CTS silverface amp than with a blackface.Swapping speakers is the easiest and most effectful change you possibly can do to your amp.A stock VR offers a wide range of tonal possibilities and can be both big and small with just a few minor tricks.
Out of the box the silverfaces and blackfaces will fit many occasions and are therefore not widely discussed in terms of serious mods like, for instance, the Princeton Reverb.
You’ll need schematics to implement some of these mods. We usually start with explaining a mod from a functional perspective where we relate to components in the logical schematics diagram.