JANSEN: TR25 Transistor Guitar Amp

This is a fairly obscure solid-state guitar amplifier from New Zealand - I don’t know exactly when it was made, but it does scream the 1970s.   I bought it for $50 a few years back and have been using it as my test amp in the workshop/garage - it has been misbehaving a little lately, so I bought a Vox Pathfinder 15R as a replacement.

I haven't been able to track down a schematic, so this morning I pulled it apart to see if there was anything obviously wrong - there was quite a bit of corrosion, and some insects have been using it as a home at some stage (not uncommon in Australia for an old amp).  I gave the board a clean, and there was also a broken stabilising spring in the reverb tank, which I repaired.

It's rated at 25w, and it's not very loud.  Single 12" speaker of an unknown brand - not sure if it's original.  Controls for volume, bass, middle & treble, tremolo and reverb.  It does have a really nice tremolo and combined with the reverb it can do a pretty cool vintage-sounding clean tone. 

JANSEN TR25 SOLID-STATE GUITAR AMPLIFIER

Looks like they used quality parts back in the day, with a couple of massive 3,300uf capacitors across the power supply

Sanyo STK029 Power Amplifier 

One very dirty circuit board - gave it a good clean before putting it back together.

Small Accutronics 2 spring reverb

Broken suspension spring