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JMI Vox AC 10 Chassis

Picture
I have been after an AC15 chassis for a long time to fit into the 1964 cab I have.  Then the opportunity of an AC 10 came along.  The top panel is narrower, but with a bit of plywood and fiddling, I made a plate to fit the gap.  The plate is a bit rough and is a temporary measure until I can get into a workshop, but its still a Vox!  The extra space in the cabinet should help it to breath a bit easier, as the early Voxes were prone to overheating. Another advantage is the 12" speaker, which really gives it some more poke!  It's fitted with a very old Fane 25 Watt, 15 Ohm speaker, which sounds great, but If I can ever afford a Celestion Blue, that's what I'd put in.

Not much has been done to this, other than give it a bit of clean and replace a microphonic ECF 82 for the tremolo / normal channel.  I couldn't believe my luck getting a NOS Mullard in original packaging for less than a tenner! I also added a couple of 100k resistors in parallel with the 220k input resistors to open up the gain, so it now has a low and high socket on both channels. It has made a massive difference and should help it to overdrive nicely.  They can easily be removed if needed.

Someone before me did a very good job of replacing most of the resistors, although I think they are carbon film rather than the original, noisier carbon composition resistors.  I really don't care about that.  Theres a lot of bull talked about carbon comp, but if you read the physics around them, they only distort in high voltage situations.  All the original Wima caps are in place and It sounds beautiful.  It has the original Albion transformers too. 

The only thing to do is replace the tired filter caps for peace of mind, and make sure there's plenty of ventilation around the mains transformer.  You can see in one of the pictures that some wax has melted at some point but nothing to worry about.  I got this from a great guy who had kept it for about 30 years and fired it up maybe once a year and had it serviced.  It spent it's earlier years powering a disco.


Update 8th Oct 2013
Both the original filter cans have just been replaced with F&T equivalents.  I also installed a decent footswich.  As expected the hum has virtually disappeared. (4 new pics)
Musicman RP 112 Sixty-five            JMI Vox AC 10
Elpico AC52                                     Carlsbro CS 60
Filmosound Amplifiers                      Hiwatt Lead 50R
Lab Series L2                                   Burns
Lab Series L5                                   Fender Twin Reverb
Selmer Constellation 20                   Fender Musicmaster Bass
Selmer Treble & Bass Mk 2              Impact 60
Schaller KV40                                   Northcourt 50
Fender 5F1 Champ                           RSC Bass Major
Traynor YGL 3 - Mark 3                     Mystery Amp
Watkins Westminster                         Denco 912-Plus
Denco 912-Plus                                 Interesting Waveforms
Wem Dominator Mk 3                        Mullard 5-10
Wem Watkins Copicat Mk 3               Decca Amp
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  • Repairs & Servicing
    • Guitar Amp Service & Repair
    • Business Card
  • Contact
  • Amps & Stuff
    • WEM / WATKINS >
      • Watkins Clubman
      • Watkins Westminster
      • Watkins Westminster Mk 9
      • WEM Control ER15 No. 1
      • WEM Control HR 30
      • WEM Dominator Mk3
      • Watkins Copicat Mark 2
      • Wem Watkins Copicat Mk 3
      • Wem ER100
      • Wem PA100
    • Baldwin Burns Amplifier
    • Carlsbro CS 60 PA
    • Elpico AC52
    • Leo Fender >
      • Fender Concert Repair
      • Fender Twin Reverb 1977 Silverface
      • Fender Twin Reverb 1972 Silverface
      • Fender Blues Deluxe
      • Fender Musicmaster Bass Amp
      • Musicman RP 112 Sixty-five
    • Gibson >
      • Gibson Mercury
      • Gibson Falcon GA19RVT
      • Lab Series >
        • Lab Series L2 Service and Repair
        • Lab Series L5 100W Combo (Gibson/Norlin)
    • Hiwatt Lead 50R Combo
    • Marshall >
      • Marshall Artiste
      • Marshall Superbass Mk2 100W Head and Cab Service Repair
    • Miscellaneous Amps >
      • Harmony H307x
      • Hotpup 5F1 Champ
      • Impact 60
      • Mystery Amp
      • RSC Bass Major
    • Orange >
      • Orange OR120 1970s Service and Repair
      • Orange TH 30 repair
    • Schaller KV 40
    • Selmer >
      • Selmer Constellation 20
      • Selmer Treble & Bass Mk 2
      • Selmer T&B 50R SV
    • Traynor YGL 3 Mark 3
    • Tripletone Amp Conversion
    • VOX >
      • Vox AC 10 (JMI)
      • Vox AC 30 TB Restoration
      • Vox AC 50 Repair and Overhaul
  • Blog
  • Other
    • Marconi C10A radio
    • Interesting Waveforms