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FDP Forum / Fender Amps: Vintage (before 1985) / 1983-84 London Reverb ribbon cable heads-up

Stratopastor

Stockton-on-Tees

now even awesomer
Nov 11th, 2017 04:11 PM   Edit   Profile   Print Topic   Search Topic

I've just replaced the input jack on my London Reverb - the new one is spaced off the pbc with a short piece of shielded cable making the connection. In the process I had to disturb the ribbon cables, and that's where extra patience was called for.On reassembly and only after warm-up, the overdrive channel was dead. Chassis out again, tap and poke everything... one ribbon-cable in one on pcb had a tiny cracked joint. Reflow'em all, reassemble, overdive channel now fine, graphic EQ now dead. Chassis out again, tap and poke the relevant ribbon cable reflow all the joints on the pcb,that ain't it. Continuity test pin-to-pin; that, plus close inspection, reveals a break in one conductor. Scrape away some insulation, solder a little hookup wire to bypass the break, test before reassembly this time darn it, all well, reassemble, soak test, all OK.

It's a testament to a 33-year-old, well-gigged solid-state amp that all the actual pcbs and components are doing fine - well done, the Gulbransen Organ factory in Hoopeston, Illinois. But if you ever have to go inside one of these, or its sisters the s/s Showman and Montreux... don't handle them ribbon cables any more than you have to... :-)

FDP Forum / Fender Amps: Vintage (before 1985) / 1983-84 London Reverb ribbon cable heads-up




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