
Valves man, expensive ones. PX4s were used as output pairs in many of the best home audio devices from the 1930s onwards.
Here's what they look like and they're worth more on their own than the value of the radiogram is in its present, fully working condition:
HiFi snobs (audiophools) build entire amps around a pair of these in the mistaken belief that they sound better (than modern valves like the ECL86),
fortunately the folks' radiogram has its originals. Fortunately because new ones cost around £800
EACH!
On the late, great Sir Jimmy, country music legend and unfeasibly tall, thin man:
http://en.wikipedia.org/wiki/Jimmy_Shand
And where Fifty Cent comes into it, scoring 21st century chart success with a sampled Scottish country tune written by Sir Jimmy: