Belmont-Radio-Corp-6D121 电路原理图.pdf

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1、MANUAL OF 1949 MOST-OFTEN-NEEDED RADIO DIAGRAMS R. F. AMP CONVERTER I2SK7 I2SA7 I.F. AMP I2SK7 2ND DET AV.C. !?TS/9Jo USfi-fiiB a *! MODEL 6DI2I Jpfl SERIES A wr A.C.OR O.C. A Tee cio (cti . T T Pl*-T “ NOTE: On some sets slug tuned I.-F.s are used instead of trimmer tuned I.-F.s. 108-140H and 108-1

2、45 are trimmer tuned. B-13A-12023 and B-13B-12022 are slug tuned. The slug tuned 1-F.s are tuned from the top and bottom (secondary NOTE: TMMMCRS ARE UhOCR C2 - CHASSIS. 2SK7*W%H .H TMf l yTFTp ( |jwt1| rP O 12SA7 l 4S K.C. I 1 4M K.C. I r OUTSIDE ANTENNA CUP *0 CHASSIS VIEW, SHOWING TUBE LOCATIONS

3、(See note above ou I.-F.s) on top, primary on bottom). Slug tuned I.-F.s cannot be used to substitute trimmer tuned I.-F.s but trimmer tuned I.-F.s can be used to substitute slug tuned I.-F.s. Part Schematic Description No. Symbol CONDENSERS r-RD-10963 C17 .15 MFD X 400 volts. C-8D-19778 Cl, C15 .00

4、2 x 600 volts, +40%. 15% C-8F3-12 C3 470 mmfd., mica, 20% C-8D-10760 C4 .1 x 400 volts, +20% C-8D-10775 C5 .25 x 200 volts, 20% C-8F3-8 C6, C8, C19 .001, mica, 26% 11994 or Electrolytic (for 50-60-cycle sets), A-8C-10077 C9, CIO, Cll 40 mfd. x 150 volts, 20 mfd. x ISO s- o volts, 20 mfd. x 150 volts

5、. r-RD-10770 C12 -05 x 200 volts, 20% 129161 C13, C14 Dual .0001, mica- i0% C-8D-10774 C16 .02 X 400 volts, 20% C-8D-10778 C18 .004 x 600 volts, 26% RESISTORS C-9B1-13 R1 1000 ohms, 14 watt, 20% C-9B1-31 R2 1 megohm, 4 watt, 20% O-9B1-50 R3 100 ohms, % watt, 10% C-9B1-26 R4 150,000 ohms, 14 watt, 20

6、% C-9B1-42 R5 22 ohms, 14 watt, 10% C-9B1-70 R6 4700 ohms, 14 watt, 10% C-9B1-25 R7 100,000 ohms, 14 watt, 20%r C-9B1-28 R8, R14 47,000 ohms, 14 watt, 20% C-9B2-53 R9 180 ohms, 1 watt, 10% C-9B2-63 R10 1200 ohms, 1 watt, W% 0-9B1-34 Rll 2.3 merohms, 14 watt, 20% C-9B1-52 R12, R13 150 ohms hi watt, 1

7、0% C-9B1-29 R16 470,000 ohms, 14 watt, 20% C-9B1-27 R17 220,000 ohms, 14 watt, 20% C-9B1-35 R18 4.7 megohms, 14 watt, 20% C-9B2-44 R19 33 ohms, 1 watt, 10% C-8D-10963 C-8D-10778 C-8F3-12 C-8D-10760 C-8D-10775 C-8F3-8 11994 or A-8C-10077 C-8D-10770 129161 C-8D-10774 C-8D-10778 C-9B1-13 C-9B1-31 C-9B1

8、-50 C-9B1-26 C-9B1-42 C-9B1-70 C-9B1-25 C-9B1-28 C-9B2-53 C-9B2-63 C-9B1-34 C-9B1-52 C-9B1-29 C-9B1-27 C-9B1-35 C-9B2-44 ALIGNMENT PROCEDURE No aligning adjustments should be attempted until all other possible causes of trouble have been checked. Chassis must be removed from cabinet for proper align

9、ment. Slight adjustments of the oscillator and antenna circuits can be made, without removing the chassis, through two holes provided on the bottom of the cabinet. The two adjustment screws can be reached with a long insulated screwdriver. It Is important that during alignment the loop antenna be ma

10、intained at the same distance from the chassis as when the chassis Is installed in the cabinet. e Turn volume control to maximum for all adjustments. Connect ground post of signal generator to B of radio through a 0.1 mfd. condenser. Connect dummy antenna value in series with gener ator output lead.

11、 Connect output meter across primary of output trans former. Grid of 12SA7 Grid of 12SA7 Rotor full open (plates out of mesh) Rotor full open (plates out of mesh) Set dial at 1400 Kc. 4 trimmers on input and output I.F. transformers (See note)_ Oscillator trimmer C7 on bottom of radio Antenna trimmer C2 on bottom of radio Note A: Lay output lead of generator In back of loop antenna. Turn up generator output. Loop antenna will pick up 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN