I am in the process of refurbishing a T4XB that has been significantly modified. (This is more like a detective story and whodunit or done what?)
The can electrolytic which I believe is a combination of C129 and C140 was removed from the T4XB and a metal plug was fitted to the chassis. I have a manual I downloaded and in the spare parts list is the following entry for a combination electrolytic C129 = 20 Mfd @ 250 Volts C140 = 10 Mfd @ 25 Volts The schematic from the same downloaded manual shows C129 as being 60 MFd. In this T4XB, C129 has been replaced with a 60 MFd @ 350 Volt radial electrolytic that was cable tied underneath the chassis to hold it in place. Thus two questions: 1) Which is the correct value? (I would think having the larger value of capacitance is more desirable especially since this is in the plate circuit of the 12AX7.) 2) I have no problem with having something different in the radio so long as it is electrically correct. But is there any chance the dual electrolytic originally installed is available from some source. The can as originally installed appears to have no insulating ring and the three ears on the can were simply bent over and soldered to the chassis. Or is on the "unobtainium" list? Thanks in advance. Pete N6QW
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