. QST . ventilation of the compartment. Several j^-int-hholes are also made in the box top directly overthe 6146. Wiring The power su))pl> is wired first. The centertaps of jfi and tlu; high-voltage winding of T^are connected together and soldered to the low-voltage terminal of Sz. A lead is connected from LiSTTTX one of the 5Y3 filament terminals to the high-voltage terminal on Sz. One lead from L4 is con-nect<^d to the arm of iS3. Many Novices maywonder why the two 8-/if. electrolytic capacitorsare connected in series. This is to double theworking voltage of the filter. Next, the beiow
. QST . ventilation of the compartment. Several j^-int-hholes are also made in the box top directly overthe 6146. Wiring The power su))pl> is wired first. The centertaps of jfi and tlu; high-voltage winding of T^are connected together and soldered to the low-voltage terminal of Sz. A lead is connected from LiSTTTX one of the 5Y3 filament terminals to the high-voltage terminal on Sz. One lead from L4 is con-nect<^d to the arm of iS3. Many Novices maywonder why the two 8-/if. electrolytic capacitorsare connected in series. This is to double theworking voltage of the filter. Next, the beiow-chassis portion wiring of section is completed. The oscillator will work\\ ith less capacity for Ci but the crystal current is ■001 ,-,^.„ S4. Fig. 1 — Circuit diagram of the 6146 oscillator. Li — ^h. (Ohmite Z-144) choke. L2, L3 — See text and photograph. L4 — henrys, 110 ma., 225 ohms. S3—1-pole 6-position (2 used) wafer switch, non-shorting (Centralab 1401). Si — 1-pole 6-position (2 used) steatite wafer switch,nonshorting (Centralab 2501). Ti —• Filament transformer, volt, —Power transformer, 360-0-360 volts, 120 ma., volts amp., 5 volts 3 amp. (StancorPC8410).Unless otherwise specified, all capacitor values aregiven in microfarads. Fixed capacitors except 8-/if. elec-trolytics and Ci are disc ceramic. August 1955 27 likely to run higher than desired. No socketshould be used for the 2-volt GO-ma. dial lamp inseries with the crystal. A 5^-inch rubber grommetis used to hold the dial lamp in place. The insidediameter of the grommet is ^g inch, just largeenough to accommodate the glass envelope of thelamp. Connections are made to the lamp bysoldering leads to the base point an
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradio, bookyear1915
