| Show A tubes use less currett than old style thousands of broadcast listeners who haye have radio receivers consisting of detector and two stages of audio fre quency amplification are still using the original UV tubes purchased when they installed their sets these tubes have been superseded by the UV As als which consume less leas current than the old stylo tribes consequently when the inevitable change Is made to the new tubes a greater resistance must be provided in tile the rheostats it the amell amplifying yang unit hns has a rheostat for each ach tube as Is lly the case there lew t A f to mbye 10 b ca row how the low resistance rheostats of a standard amplifier aro ara connected up to be used with 01 A vacuum tubes Is a simple way to do this without substituting sti new rheostats adding outside or changing the appearance of the set audio frequency amplifying tubes are not critical I 1 oue one control will therefore do for both tubes remove all connecting wires from both rheostats except the current supply wire to the first rheostat connect tho the rheostats together as shown bridging across the adjacent posts with bus wire or it if more resistance Is wanti want ed than Is afforded by the combined rheostats with a section of resistance wire from a discarded resistance unit A connection Is then run from the remaining binding post of the joined rheostats rheo stata to each of the two sockets taking the place of the original connections the combined of tile the rheostats rheo rheostats will make the proper resistance a si I 1 for two 1 2 1014 X tubes when connected in this marmer manner besides allowing ample variation using either cither or both knobs to secure brilliancy of the filaments |
