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Re: 453 trace finder location


 

Pat,

The trace location is under the graticule intensity knob on the left. Likely the contacts are dirty. C1194 and/or C1181 is the one you are talking about with the corroded lead. The first one I put in a film type. The output decoupling, I used a 56mfd 100V Nichicon UHE type since I had these in stock. C937 could be bad giving you the higher ripple than you want on the negative supply for the crt. If you replace it, use a high temperature, low ESR type that is 35V, e.g. Nichicon ULD or UHE type. The capacitance is not critical so if you put in a larger value, it is fine. Do not lower the capacitance. A 47mfd to replace a 50mfd is close enough, not something like 33mfd or less. You could increase the value of C966 to lower the ripple.

The slow warming could be the 8393 Nuvistors are weak, if yours is old enough to use them.

Mark

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