PYE Monitor Mayhem Part 1 – Paul makes a start on bringing a number of Pye monitors back to life.
Published 2024-03-14
Long-time storage in damp conditions makes the task difficult however a basic surface clean is enough to enhance the looks of the cabinet. As you might expect a preliminary look at the electronics points to much work being required – more to be seen in later videos. Stay tuned!
All Comments (6)
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Aquadag, my friend, don't you peel away so easy?
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A labour of love, sweat and tears.....
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Bad news on the CRT. Probably an "air-tube" (down to atmosphere) The centre burned phosphor dot is from an undeflected beam during switch off. Usually the driving electronics would hold the CRT in grid cut-off long enough for the EHT to decay. The capacitor in that circuit probably failed first. The CRT can only be saved by cutting and rebuilding. The centre "halo" is possibly damaged phosphor from ion bombardment. For this vintage CRT there is/was an ion-trap permanent magnet on the CRT neck (which may have fallen off?) CRT design progressed to "aluminized screens", a thin layer of metal deposited behind the phosphor, that blocks ion bombardment and also increases light output (acting as a mirror) Not sure if this tube has that feature? These phosphor faults are not related to loss of vacuum.
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That second monitor CRT looks like it may have gone to air. The dark circle and the missing phosphor in the center is indicative of vacuum loss.
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Video on PL259s not BNCs that's pretty heavy duty British eng.
