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Old 19th Sep 2020, 12:43 am   #1
FStephenMasek
Pentode
 
Join Date: Jul 2011
Location: Mission Viejo, California, USA
Posts: 142
Default PX4 substitutions

The volume from my HMV468 is low. I replaced the capacitors, some resistors, both diodes and the less expensive valves, so that leaves the PX4.... I found some older threads regarding substitutions. What is your current thinking? Of course, if I can find a decent used PX4, that is the easiest approach. I'm not inclined to replace the socket, as this is a somewhat rare radio, although the chassis was used in several different cabinets. This one has the later version of the chassis, with a fuse in the high voltage winder center tap return, a nice feature to save the power transformer. Making an adapter might be a good approach. I do not have any transformer winding equipment, so getting 6.3 volts for the filament of a 6L6 or some such seems impractical.
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