March - July The picture above is from the Vox solid state catalogue of July The amp ilustrated is actually a pre-production model - note the position of the footswitch socket. For more on prototypes and pre-production amps, see this page. The normal channel had the tremolo along with switchable top boost.
The treble channel had the distortion and a mid range boost effects network. Reverb could be switched between the two. The speaker cab was a 2x12" containing two Celestion Ts 8ohms each wired in series, and a Goodmans Midax horn - see the examples below, on this page.
Side stands enabled amp and cab to tilt backwards. The latter could be fixed to the former with a chrome tongue and bracket arrangement. The Defiant's analogue in the solid state bass range was the " Foundation Bass ", which shared the same power section ie. From most angles, the amp section of the Defiant closely resembles a Supreme - the same number of vents on top, same size box, and so on.
If both those are missing, taking the back panel off should provide the clue: Covers were provided for both amp and cab, the latter being extremely rare these days. Production of the amps on this page began c. At first, the serial number is given solely as four digits xxxx. The sequence begins at After the first forty or so amps, the form of the number is given as ST..
As has been mentioned, "ST" stands for "Super Twin", indicating that cab and amp are separate. The first control panels are generally deep black. Fixings for the preamp are present on top of the wooden cases in the early amps at front, near the corner protectors.
Jack input sockets are at first metal and of open construction. Black plastic inputs superceded these. Logos initially simply state "VOX".
Lettering is in silver. Later the lettering is in gold, and then "VOX. Back panels are cloth covered and have angled corners. Post-JMI panels have square corners. Two indicator lamps are present - one for mains supply, one for the standby circuit. The standby lamp was done away with later.
Contrary to myth, the Beatles did not use Defiants at any time - only Conquerors see this page - but Freddie and the Dreamers did: Defiants just visible on stage. Pics from this thread. The serial numbers of those run from - Below, a register of surviving amps. If anyone knows of early Defiants that have not yet been included, do let me know. Serial number Serial number The cab, a Vox Sound Ltd unit which had Celestion greenbacks, was sold separately from amp.
Serial number A fantastic early amp. Pictures of the cab, which at some point in its life had been regrilled with Selmer cloth, are immediately below.
Sold on ebay UK in June - just a few pics from that auction. A set of pics of dated components inside the amp are now on this page. Cab probably originally from - currently in the UK? Evidently a working unit for many years, the recovering and regrilling themselves showing signs of much wear. The new tolex covers the holes for side stands and mounting hardware on top of the cab.
Inside, the original speaker wiring diagram and original speakers, though one was blown, along with the Midax horn. The cab is termed, as in the case of the cab above, an ST A good early Defiant with a later cab "Solid State" in the logo - the side stands are repros, designed for an AC30, but do the job.
On the amp, indicator lens replaced, and the Belling Lee mains input socket adapted as a cable pass-through. Serial number - currently in the USA Amp alone. All effects in order.
Serial number - currently in Australia A full rig in almost unbelievably pristine condition - complete with hang tags dated April , and covers. The cab is designated an "ST50". Thanks to Paul for the pictures.
NEW Serial number - currently in the UK Brown control panel, input jacks with white surrounds, and screws to secure the preamp by the upper front corner protectors. A bit of wear and tear externally, but apparently otherwise in good order. Serial number - currently in the USA? Images from two different auctions, the first with a reproduction Defiant cab bearing a 7-series style logo. The amp is complete with its cover, mains lead, and footswitch. Serial number - currently in the USA Serial number - currently in Europe A nice amp, cabinet mounting hardware still in place.
Original Celestion drivers still in cab. Also present, the guarantee slip with the type of amp stamped on, and the serial number hand written. Serial number - currently in the UK? A nice Defiant with a Foundation Bass cab. Thanks to Steve for the pictures. Serial number - currently in the UK A first set of pictures from the auction in The seller notes the serial number as being ST A second set of pics from the amp's re-sale in Serial number - currently in Germany Currently here.
Ignore the now standard fantasy - fantasy it is - about Defiants being used by The Beatles. NEW Serial number - currently in the Netherlands Superb condition, complete with original covers. Both amp and cab have plain silver VOX logos.
The cab retains its original drivers and wiring diagram. Rope carry handles added to the speaker cabinet. The screw threads for the side stands appears to have sheared off.
Plain silver VOX logo, white ring input sockets, twin indicator lamps, preamp screws on top of the box. The cab has a silver VOX logo too. Serial number unknown - currently in the UK? Brown control panel, preamp fixings on top of cabinet. Serial number unknown - currently in the USA? Serial number unknown - currently in France A good Defiant rig. Still metal jack sockets and top fixings for the preamp. Note the large hoods to the casters, also found in some Conquerors of the same period.
Currently on offer here. Serial number unknown - currently in the UK A nice rig. The cab is in a repro trolley for which it was not intended - note how low it sits in relation to the top bars.
Serial number unknown - currently in the UK Sold on ebay. Probably an early amp. White surrounds to jack sockets. Serial number unknown - currently in Scandinavian Possibly an early amp. Hard to tell, but probably white surrounds to jack sockets.