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Orange TH 30 Repair

Picture
This Orange TH 30 looks like a British built amp but is made in the PRC like so many modern amps these days.  As such, it shares the same "feature" of every wire connection terminated with a spade connector.  These often make poor and sometimes intermittent connections and are a cause of all sorts of problems.  I hate them!

That said, it's a heavy beast with decent looking components and a solid build quality.  It features 2 channels clean and dirty, has 4 different power settings, with a three position standby switch offering full and half power, and on the rear you can switch between 2 and 4 power valves.  This makes it highly versatile.
It had a broken jack socket and the drive channel hummed a lot, had poor volume and the tone controls didn't work very well.  I tested all the pre-amp valves and one was significantly weak.  Replacing that cured the problem with the dirty channel.  However, whilst chop-sticking around I noticed some glitching on the scope.  A couple of those spades were loose so they all got to feel the heat of my soldering iron.  Whilst in there, all the tube socket joints to the PCB were reflowed, adding a little extra lead free solder to each just to make sure.
 
As the input jack socket is fixed to the PCB and I couldn't find an Orange replacement part, the loose ferrule had to be bonded in place.  Superglue is not appropriate here so I used a solvent based contact adhesive.  This dries like rubber and is strong enough and flexible but will allow the ferrule to be removed if required.

All in all, not a bad amp with a great clean channel and some seriously raunchy overdrive!

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  • Repairs & Servicing
    • Guitar Amp Service & Repair
    • Business Card
  • Filmosound
    • Filmosound Guitar Amps
    • Filmo New Style
    • Filmonator Prototype
    • Testimonials
  • 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
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      • Vox AC 30 TB Restoration
      • Vox AC 50 Repair and Overhaul
  • Blog
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  • Other
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    • Interesting Waveforms