Re: [Harp-L] Fender Vibrosonic

[Special20 <special20harp@xxxxxxxxx>]

Why would you change the Phase Inverter tube?

-Spec20

On Fri, Mar 7, 2008 at 7:43 AM, David Harris <snakehead_1@xxxxxxxxx> wrote:

> Jim,
>  My research show that this is the standard layout of the tube layout for
> the Vibrosonic:
>
>
> http://bb.steelguitarforum.com/viewtopic.php?p=1095549&sid=9b8d27feec6f14b61cf9263c596f73f2
>  (Stock tube layout facing the rear of the amp)
> 4 6L6GC Power Tubes
> 12AX7A 1st stage gain
> 12AX7A 2nd stage gain
> 12AT7 Reverb Driver
> 12AX7A Reverb Return
> 12AX7 Tremolo
> 12AT7 Phase Inverter
>
>  Is that close to your current setup?
>  What I would suggest is concertrate on changing the Gain tubes and the
> Phase Inverter.  Don't even use the Reverb and Tremolo for harp.  You
> should, however, make sure that you replace any blown or worn out bulbs.
>  Especially since you mentioned intermittent performance for the tremolo.
>
>  Here are my suggested tube types:
>
>  12AX7 1st stage gain
> 12AU7 2nd stage gain
> 12AU7 Phase Inverter
>
>  or
>
>  12AT7 1st stage gain
> 12AU7 2nd stage gain
> 12AU7 Phase Inverter
>
>  or
>
>  12AT7 1st stage gain
> 12AU7 2nd stage gain
> 12AY7 Phase Inverter
>
>  Try those and see how they sounds.
>
>  Dave Harris
>  http://www.myspace.com/superdharris
>
>
> "Priest, Jim" <Jim.Priest@xxxxxx> wrote:
>  Anybody have any experience of, or views on, a Fender Vibrosonic Reverb
> as a harp amp? I just acquired one of about mid-70s vintage. It's in
> just-about-working order but has been in the wars somewhat and needs some
> TLC. It has a single 15-inch speaker (which looks like a replacement but has
> no discernable id), tubes are 4 x 6L6 power, MESA brand (one of which has
> blown) and 6 assorted pre-amp. It has in-built reverb (working) and tremolo
> (intermittent). And it weighs a ton!
>
> Any suggestions on tube config or upgrades/mods that will suit it better
> for harp?
>
> Cheers
> Jim
>
>
>
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