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OLDAMPS
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Traynor YGL3 Mark 3
Repair & Overhaul

Picture
Built around '73 or '74
When I purchased this as a "working" amp, all 4 EL34s were red plating.  I immediately switched it off, once I had played a chord or two to determine it just about worked.  After a thorough visual check, I replacing a couple of burned out and crumbled 10 Watt resistors and rewired the speakers back to 4 Ohm. The main Mallory "cigar" 40uf + 40uf caps were replaced with a JJ 50uf + 50ufs and the added on 32uf was discarded. Well that stopped the red plating.

Although the old valves were working, there was a horrible sounding under-note being generated, especially on a low b.  Time for a new set of Tung Sol EL34s.  Unfortunately they didn't work until I figured out someone had put a 58k in the bias supply.  It was running about -58V.  Should be around 37.5V.  I changed this for the 18k on the schematic, and checked the voltage again (37V about half way on the trim pot)  I set the bias quit cool (120mA for 4 el34s) and WOW! I discovered the most amazing amp I have ever played through!  Fender clean spanky and loud from chanel 1, and Marshall crunch from channel 2 with the gain up full.  There's a great clip on You Tube of someone playing a Les Paul through one of these along with Pink Floyd.  Who needs a tube screamer!

The reverb is just like my old Fender Twin and the the Tremolo is gorgeous. What about that brass plate on the back?  This is really a special amp.  Most owners of these say they are difficult to overdrive, but this one has it in spades, at least a low volume.  I haven't had chance to crank it yet.

Since these pictures were taken I have replaced all the electrolytics.  I haven't noticed any change in tone, but I know everything is good for another 20 years or so.
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
  • 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
    • VOX >
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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