@paulread2922 As those monitors have been stored in damp conditions you might consider 'warming' the line output transformer to drive out any moisture that's been absorbed over the years. On valve sets the symptoms of moisture are reducing width after 30-45 mins of operation and the transformer running hotter than it should, effect is almost like a shorted turn. Passing a small current through the transformer for 24 hours or so drives the moisture out. On valve sets it's easy, connect between line output anode valve top cap and EHT rectifier cathode, you want about 1 to 2 watts which your bench supply will do.Transformer should feel just slightly warm to the touch when the current is passing through it. More awkward with transistors as they may need disconnecting.Anyway,just a thought.
dear God im a cameramen ( joined in 1990 ) and all i have to do is point glass at stuff, tho i can remember when we had people employed who could actually understand this video and follow circuit diagrams, not its all IT people
Horizontal intermittent faults are always fun to chase.
Well done, thank you.
Those red capacitors are notorious for problems, think they were made by Plessey.
Are they dual standard 405/625 monitors?
So we found! These monitors will also do 525/60. Truly multi-standard.
@paulread2922 As those monitors have been stored in damp conditions you might consider 'warming' the line output transformer to drive out any moisture that's been absorbed over the years. On valve sets the symptoms of moisture are reducing width after 30-45 mins of operation and the transformer running hotter than it should, effect is almost like a shorted turn.
Passing a small current through the transformer for 24 hours or so drives the moisture out. On valve sets it's easy, connect between line output anode valve top cap and EHT rectifier cathode, you want about 1 to 2 watts which your bench supply will do.Transformer should feel just slightly warm to the touch when the current is passing through it.
More awkward with transistors as they may need disconnecting.Anyway,just a thought.
Good tip, Hugh
dear God im a cameramen ( joined in 1990 ) and all i have to do is point glass at stuff, tho i can remember when we had people employed who could actually understand this video and follow circuit diagrams, not its all IT people