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In Reply to: RE: Fixed bias problem "fixed" or when it rains it pours. posted by DAK on January 19, 2017 at 16:14:33
A bad transformer is freaky. Usually lasts a 100 years or more.
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which made a troubleshooting even more challenging. I suspected the fil trans early on but was loathe to change it out since that took the most work to deal with. And in combo with the LED, which i am sure caused some instability because it made the driver tube amplify some very high frequency signals.
LED's are not created equal, some are remarkably noisy. The low impedance, 'standard' Red LED from Agilent is among the best in terms of delivered impedance and noise. The 'high intensity' variants are all higher impedance vs the standard sort.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
I dont see any part numbers or manufacturer marks.
Until you pull too much current through them once.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
And that came back to haunt me. I thought that it would be a case where either it worked or it didn't. Instead it worked when it wanted to for about 4 to 10 minutes and then increased current demand sent it packing. As with everything, you learn the most by solving problems and making mistakes.
Used = unknown
"As with everything, you learn the most by solving problems and making mistakes."
Amen to that!
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
x
you only have to screw up "new lead outs" once to abandon that ship.
after my failure I pretty much threw out everything I'd replaced leads on...
(chokes, filament transformers, a nice power transformer I ruined)
I have seen it done countless of times other than the additional wire marring the color scheme, i have found little to show that adding some wire jeopardized the functioning of a transformer.
And with 30 years of designing TV broadcast systems and equipment I have found nothing to show that replacing manufacture supplied component lead-outs is of any benefit whatsoever.
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