Elsewhere on this website, Tim wrote a very interesting account of his repair to a table radiogram.
http://www.vintage-radio.com/recent-...n-391trg.shtml
The use of a PCF80 as a phase splitter is interesting. Old 'uns like me will remember these valves being used as frequency changers in 405 TV's. My theory is that the heater/cathode insulation is better than that of an ECF80 because of its original use in series heater chains in AC/DC sets of the time. Therefore if it is directly coupled to the EL84 as in this present application, it's cathode is running at a much higher voltage than normal. It was probably felt that the greater heater/cathode insulation would be more reliable.
I remember a record player being manufactured by Philips that used an EL84 and a UL84 in cascade. The UL84 cathode was directly coupled to the anode of the EL84. The UL84 was chosen because the cathode was running at about 100V and the heater/cathode insulation was able to withstand this.
Rich