Radio and Television Today (Jan-Nov 1941)

SERVICE NOTES ZENITH CONSOLTONE CIRCUIT (Continued from page 36) resistor being out of phase cancel and no degeneration takes place except at the high frequencies. This arrangement produces a bass-boost circuit which gives an acoustic output more nearly like that obtained from a console with a large diameter speaker. Rider's Manual with Simplified Circuits The new Perpetual Trouble Shooter's Manual twelve published by John Rider, 404 4th Ave., New York, has added another new feature that will be a welcome help to servicemen. One of the troublesome features of modern complicated circuits is the wiring of the rotary deck switches used to change the tuning bands. The intricate connections of these switches and tuned circuits are broken down and re-drawn into a simplified schematic which includes only those components which are active on each particular band. These simplified schematics are all grouped into one section of the book and are cross referenced Combination of feedback and degeneration produce a boost of the low audio frequencies for more realistic tone in table models. with the circuits to which they apply. The big book includes the circuits of receivers built in the past 12 months. GE Plans to Help Jobbers' Tube Business Servicemen of the. U.S. are now being invited by General Electric Co. to take their old tube stocks (of any brand) to GE distributors, and to earn valuable certificates by purchasing an equivalent number of new GE tubes. The certificates are to be redeemed by the jobbers for test equipment, or such premiums as typewriters, clothing, furniture, cameras, etc. The plan was worked out by GE manager of tube and special receiver sales, Howard Bennett, who makes the invitation via mailed broadsides to servicemen. The suggestion is, "Don't Junk Your Old Tubes" — and it's the opener of a campaign; to help jobbers ■'.vs* HOME RECORDING The New HOWARD DURO-BOARD DISCS Type 6F — 6h" Retails 10c (Full Discounts Apply) The new economy DURO-BOARD Recordino Discs have the same superior quality Type "C" Coating as the famous HOWARD Metal Base Discs. This thick, special coating, an exclusive HOWARD development, enables the cutting needle fo make clean, even grooves without tearing — a factor vital to quiet, long life reproduction. A special die-punched center prevents warping and provides extreme flexibility without injury to the disc. Order a supply today! Famous HOUJMlRD Metal Base Discs Now Packed in Albums Outstanding and in constant demand since their introduction a year ago, HOWARD Metal Base Discs now come packed five each in attractive utility albums. You'll build the maximum in customer satisfaction and repeat busi ness with HOWARD Discs. The handy counter dispenser kept filled with HOWARD Discswill make money for you. Long Playback Life Clear, Quiet Reproduction Flame Proof Safety Listed by Underwriters' Aerobe* ,000 ypC Type 16 oil-filled capacitors. Submersionproof terminals. Ideal for aircraft, policeradio and other severe-service usage. 200, 400, 600 and 1000 v. D.C.W. Unit illustrated measures only lui,i" high x IV wide x "m" deep. NOW aucUlalde toYOU . . . • Yes, you can now have those extra-heavyduty oil-filled capacitors such as the popular Type 16 here shown, as a standard Aerovox item. There is also available to you the Type 18 with side terminals and flat mounting, and the Type 30 "bath tubs," for quality assemblies. • Ask your Aerovox jobber about these commercial-grade capacitors. • Or write us direct for literature. FfCQVW CORPORATION NEW BEDFORD, MASS. IN CANADA: AEROVOX CANADA. Llmlt.d Hamilton. Out 38 RADIO TOD A Y