Vox SS Royal Guardsman Super Reverb schematics??

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6/8/2005 7:55 PM
anonymous	Vox SS Royal Guardsman Super Reverb schematics?? Anyone have a schematic for this amp?   What a nightmare - built like a science project!     Thanks,   Derek

 

6/8/2005 11:05 PM
Enzo	WHat specifically are you trying to do there? One thing about their SS amps is that they were so much alike, so one of my othre schemos might cover the part you need. Or if you have access to other SS Voxs of the era, see if they relate.     Is this one with all the smallish boards in a row? They all pivot at one edge so you can flip them over without removing the wires.

 

6/9/2005 7:07 AM

Derek

The footswitch is not working properly - doesn't switch channels, lights don't work, and it looks like it has been messed around with quite a bit. the switches have been changed, all look different, probably wired incorrectly, etc. I haven't completely tested it yet, but expect many more problems than that.     It has a single board in the pre-amp housing which has an etched circuit on the bottom, but uses wire wrap posts for all component connections. Rats nest.     Just one of those things where you open it up and just know that it will be a headache. It would be handy to have a schematic of the switching circuitry - would probably cut my time in half. This is the first SS Vox I have encountered.     Derek

 

6/9/2005 2:09 PM

R.G.

I'm something of a Thomas Vox nut.     You may want to read the Thomas Vox pages at GEOFEX (http://www.geofex.com) for some background.     I do have the schematics, but I'm not sure that is what you need.     The 113 and 1131 Royal Guardsman footswitches all connect to ground through the coil of a relay to do the internal switching. The switching contacts are on relays internal to the amp head. The 1131*6 is JFET switched internally. The relays run from +24V.     They *are* mechanically difficult. It's easy to snap an interconnect wire off the board if you're not careful.     A few words of advice. It is so difficult and time consuming to open these things up that if you ever do open one up     **>> CHANGE OUT ALL THE ELECTROLYTIC CAPACITORS WHILE YOU HAVE IT OPEN <<**     Just do it. It's a pain, but you'll then have an amp that's semi-reliable again. And you won't have to go back in next month.     Read the GEO Vox pages, then write me with any questions.     k-e-e-n-@-g-e-o-f-e-x-.-c-o-m but leave out all the dashes.

 

6/9/2005 7:27 PM
loudthud	I agree with RG's suggestion on replacing all the electrolytics. It's well worth it in the end. Furthermore, I suggest replacing all the 1uF and 2uF electrolytic caps with film types.

 

6/9/2005 9:24 PM
R.G.	Yep, get those electros out of there.     Some variants use 10uF NP. No chance to fit film for those.     Also, you cannot replace the NP electros with polar ones. The way they're used in the circuit, the polar ones will die.     Radio Shack, of all places, supplied the 1uF and 2uF film caps for recapping my last Beatle. Mouser's a lot cheaper and virtuous.

 

6/10/2005 8:46 AM
Derek	Thanks everyone for your info.     RG,   The amp has no relays, looks like it is the FET swithed version. Do you have the schematics for this one?   Thanks,   Derek

 

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