18-04-2012, 02:04 PM
Hi Paula, PX4, common as muck in its day, rare or cost prohibitive now, yes they are on Ebay, but silly prices for a valve that might be duff. Triodes were at the start of radio, after cats whisker etc, a Dr Flemming valve, and perhaps one of the best valves, no matter what you may think, the PX4 was chosen for its " tonal quality", i guess now its fidelity. It can handle a fair output, was replaced by more modern counterparts, its a shame it was not continued, your amps link shows its versitility, and Quality, lovely Amps...regards...Alan.
