Show A tubes use less current than old style thousands of broadcast listeners who havo have radio receivers consisting of d elector detector and two stages of audio fre quency amplification are still using the original UV tubes purchased when they Instill installed idd their sets seta these tubes have been superseded by alio UV As which consume much less current than the old style tubes consequently when the inevitable chaffoo Is made to the new tubes a greater resi resistance must be provided in the rheostats it K the amplifying unit has a rheostat for each tube as Is usually the case there Is a simple way to do this without substituting sti atI now new rheostats adding outside or changing the appearance of the set audio frequency amplifying tubes ore are not critical one control will therefore do for both tubes remove all connecting wires from both rheostats except the current supply wire to the first rheostat con LON reily tore IC 9 to XIO how the low resistance rheostats of a standard amplifier are connected up to be used with vacuum tubes I 1 hect the rheostats together as shown bridging across the adjacent posts with bus wire or if more resistance Is wanted than la Is afforded by the combined rheostats with a section of resistance wire from a discarded resistance unit A connection to Is then run from the remaining binding post of the joined rheostats to each of the two sockets taking the place of the original connections the combined of the rheostats will make ohp proper tosi resistance for two A tubes when alien connected in tills this manner besides allowing ample variation using elther either or both knobs to secure brilliancy of the tae filaments |