Heathkit GR-61 Assembly Manual

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This chart is a guide to commonly used types of elec- tions should prove helpful in identifying most parts and tronic components. The symbols and related illustra- reading the schematic diagrams. i I RESISTOR aAA/v!- ffi ;l^"o"'-o"Rr@ PLATE SUPPRE$OR lilo'* ruBE CATHOOE F ILAM EN T POTENTIOMETER ( coNrRoL )c ELECTROLYTIC CAPACITOR +ll- -lt-- COLLECTOR TRANSISTOR EMITT ER COLLECTOR EM ITTER m f-lpaxsroRuER f'..'o"'| RECTIFIER (DloDE) c-emi":,l3PER <> ! PoWDERED rnol I V1',J ! cone) ennow I li' .',t Lrh'i^H'$*nM BATTERY I l- NEON EULB I !Z rnr*sroRMER ||t_,^,**t**. PHONO (r'o"^ Y 'ttx,Jl|''ffi lf l_ PowER | > TRANS- lL FoRMER ...

RAD IO MODEL GR-61 '===*=, HEATH COMPANY BENTON HARBOR, MICHIGAN TABLE OF CONTENTS Specifications. . . . Introduetion. Circuit Description. Parts List. Step-By-Step AssemblY Circuit Board AssemblY. . . Right End Plate Parts Mounting. Left End Plate Parts Mounting. Circuit Board Mounting. . . Wiring Circuit Board To End Plates. . .. Final Wiring Final Assembly. . . Initial Test And Adjustment. . . Cabinet AssemblY. Operation. In Case Of DifficultY Troubleshooting Chart. Introduction To Transistors. . . Glossary Of Radio Terms. Circuit Board X-RaY View. (fold-out from Page). . . . . Cqyrlghto t962 12/3O/66 2 3 ...

Sensitivity. Controls. Transistors. Antenna. Speaker. Batteries. Normal Battery Life. . Accessory Jack. . Size. . Net Weight. The Heath Company reserves the right to discon- tinue instruments and to change specifications at any time without incurring any obligation to 88 to 108 megacycles. 10.7 megacycles. 3 uv for 20 db quieting (average), 5 uv for 20 db quieting (maximum). (Measurements takenin aligned condition. ) Volume, Tone, and AFC. 3 - 2N174? 4 - 2Nt274 1 - 2N24e5l 1 - 2N26711 in FM tuning unit 1 - 2N26541 Collapsible whip with provisions for external 300 Q antenna. 4r x 6t' oval, p ...

able 10-transistor circuit, housed in an attractive imitation-leather case. The front of the case is made of durable high-impact plastic. Exceptionally high quality is designed into this Radio, as evideneed by ttre preassembled and prealigned FM tuning unit, and the prealigned IF and ratio detector transformers. -ThreJIF- limiter stages, plus a ratio detector combina- tion with AFC, provide stable FM reception. The push-pull audio power amplifier circuit delivers more than adequate power for the 4" x 6" speaker to give large-room sound coverage. CIRCUIT DESCRIPTION The preassembled ...

sis network to compensate for high frequency pre-emphasis that was added to the transmitted audio signal; it thus provides a flat audio fre- quency response. This network also attenuates frequencies above the audio range. The audio output signal of the ratio detector is applied both to Q7, the emitter follower and, as an AFC voltage, to Q2 oftheFMtuning unit. Any shift of the IF from the 10.7 megacycle center frequency appears as a DC voltage which is ap- plied to diode D1; this is commonly called AFC voltage. The DC voltage shift on D1 in turn changes the oscillator capacity, thereby ef- fecti ...

are keyed to the numbers in the Parts drawings to aid in parts identification. PART No. PARTS Per Kit DESCRIPTION 4.7 Q (yellow-violet-gold) 10 Q (brown-black-black) 68 A @Iue-gray-black) 220 Q (red-red-brown) 820 A (gray-red-brown) 1 KO (brown-black-red) 1.2 KO (brown-red-red) 2.? KO (red-violet-red) 3.3 KO (orange-orange-red) 4.1 KA (yellow-violet-red) 6.8 Kft (blue-gray-red) 10 KO (brov'n-black- orange) t2 KQ (brown'red-orange) 15 KO (brown-green-orange) 18 KO (brown-gray-orange) 22 KA (red-red-orange) 68 Kf) (blue-gray-orange) 1 00 KO (brown- black- yellow) 1 megohm (brown-black- g ...

ing four part no.417-21, type 2N1214 transistors 3-48 x 1/4" screw 4-40 x 1/8" setscrew 6-32 x 3/16" screw 6-32 x l/4" screw, phillips head 6-32 x L/4" sctew, binder head 6-32 x 3/8" screw 6-32 x 3/8" self-tapping screw 6-32 x l/2" screw (in (in (in Hardware (cont?d. FM (18) 254-? I (1e) 254-e 2 FM (20) 254-1 1 (2r) 254-14 2 FM (22)254-4 1 #3 lockwasher #4 lockwasher #6 lo ...

(1) mA:IFI0--T------Tntenna bracket (2) 205-M391 (3) 205-M392 (4) 46e-Ml3 85-51F831 92-9 93-8 110-14 391 -23 401-19 (6) 431 -6 (?) 434-110 (8) 436-16 462-81 462-r8r 462-89 462-175 490-1 490 -2 3 tr42-42 390 -1 58 (e) 214-30 (10) i214-31 (1 1) ?3-4? 331 -6 595-593 Right end plate Left end plate Batterv contactor 1 1 1 I I 1 1I 1 1 1 7I 1I 1 2 1 1 1 1 1 2 3 1 P.E.C. (packaged electronic circuit) Circuit board Cabinet front Leather case FM tuning unit Nameplate Spealer 2-screw terminal strip Transistor socket Earphone jack Small tuning larob Large tunlng knob Volume knob Tapered knob Align ...

@@ 11. ( ) Conn AFC. circr ( ) Referring length of CUT THE CAE BELOW. PRE TAKING CAR€ OF THE SHIEI INSULATION. PEEL OFF TI' THIN WIRES ( Defoi Detoil lA dj, BE INSERTED FROM THE TOP (LETTERED} SIDE OF THE CIRCUIT BOARD. THIS IS THE SIDE OPPOSITE THE METALIC FOIL. ,,1,:: ir REMOVE THE SMALL IYIRES AMOUNTS OF LEAD ANO TH SOLDER --{ v L2. ( ) Ator w'ire (s-1) othe: heat may resu leadr conn KEYWAY ...

mount the I circuit boal lettered si< socket Posi of the circu align ProPe all four Pir lrcard. Be r unused hole ( ) Referring tapped spa the circuit These spac keep it le' rePositione Proceed to Pic steps surroundi Refer to Picto ( ) Remove th lettered sit them on th using tlte s PICTORIAL 3 PICTORIAI I PROCEED TO PICTORIAL 2 ...

A ni Before starting to assemble this kit, readthe Kit Builders Guide for complete information on wiring, soldering, and step-by-step assembly procedures. CIRCUIT BOARD ASSEMBLY ( ) Referring to Detail 1.{ (on Pictorial 1), mount the seven transistor sockets on the circuit troard. Insert the sockets from the lettered side of the board. Be sure each socket positioning tab fits into the keyway of the circuit board, and thatthe socketpins align properly with the foil pattern. Solder all four pins of each socket to the circuit board. Be careful not to solder any of the unused holes in the circuit board. ( ) Referring to D ...

AFC-1 (S-1) to AFC-I (S-1) on tne circuit board. Position as shown. ( ) Referring to Detail 3A, prepare a J-t/Z', length of shielded cable as shown. 12. ( ') At oneendofthecable.connecttheinner wire to AGC (S-1) andtheshieldtoGND (S-1) of the circuit board. Leave tlre other end free. Be careful not to over- heat the cable conductors since this may cause the inner insulation to melt, resulting in a short circuit. Grip the leads with pliers between the solder connection and the insulation. 13. ( ) Remove l/4t' of insulation from each end of a 9" Iength of stranded black wire. Twist the separ ...

( )M b: th sl s( la ()M al p ()M #i Set U LEFT Refer ( )M oo[-__l, tl-r-T 8ru r3z+" Ao V € fi, AFC swtTcH c f-l u I lAFc-r tltl r I te I \,/ ,r|\ ea De- nfc AGC NIT 6) FM ING U @ -ta Qz B( t-l c ? SOLDE R LUG ,-l N E 2Nt747 Q4 \Yd ' tF+ N ..+iiii @) ,lT-l @ @ k1 ...

oo tl-t-l- 8ru rZza" Ao t\) {-e il, AFC swlTcH a nu I lAFc- L_l r) a) \__/ |(r) o-a oC- nf0 AGC TUN NIT 6) FM ING U @ -la €z B( t-ic ? SOLDE R LUG lt c-l I/ve I ,/'C+ RF 1__r N E 2Nt747 o4 0r-d ' rF+ N ..,:r;jiil -.i..:rj:f 4E @ @ k1 ( )M br tt s1 st Ia ()M AJ p ()M #1 Set tl LEFT Refer ()M ...

o o o YY ,....: L rooo llFD @ NTROL TONE CONTROL Page 10 6-32 SPEEDN FLAT SIDE 6-32 NUT-\ LOCKWASH ER - T ER MIN/A RIGHT END PLA' Refer to Detail ( ) Mount two 6- plate. Be surr is positioned NE o TO -3 lNr274A L-/€ EQ5 -\n ,-\TONE-lc r\ Vr(f I l,'^\ | I \\_/rfrffi BATT_ f] -i- \7- O O O a1 OLJ 2N1747 A ())C BGF Y :fJ Deloil 1F PICTORIAT ...

6-32 NUT THIN NYLON SHOULOER WASHER AN TE NNA BUSHING SOLDER SMALL CONTROL T HICK NYLON SHOULDER WASHER RIGHT END PLATE PARTS I,IOUNTING Refer to Detail 44, for tfie following steps. ( ) Mount two 6-32 qreeftruts on &re right end plate. Be sure ttre flat side ofeachspeednut is positioned as shown. Detdil 4A Mount the antenna bracket to the end plate. Use 6-32 x 1/4"binder head screws, #6 lock_ washers, and 6-32 nuts. Mount the 2-screw terminal strip to the antenna bracket. Position it as shown. Use 6-32 x 1/4" binder head screws. #6 lock_ washers, and 6-32 nuts. () () ( )Mc bri thi slr sol lar ( ...

LARGE CONTROL LOCKWASHER VOLUME CONTFIOL Detqil 48 EAFIPHONE ,O.**ffi TONE CONTROL ( ) Mount the antenna brtrshing to the antenna bracket. Use the thicknylon shoulder washer, thin nylon shoulder washer, solder lug, and' small control nut. position and ben-d the solder lug as shown. Tighten securely with a Iarge screwdriver. ( ) Mount the AFC switch with #4 lockwashers and 4-40 nuts. Be sure the switch lugs are positioned as shown. See pictorial 4. ( ) Mount the preassembled FMtuningunitwith #6 lockwashers and 6-82 x B/16n screws. Set the right end plate aside temporarily. LEFT END PLATE PARTS MOUNTING Re ...

Page 12 Refer to Detail 4C for the following steps. ( ) Prethread the endholes ofthetopahdbottom circuit board brackets with a-O-gZ xg/g,, self-tapping screw. ( ) Mount the eircuit board to the tqp and bottom brackets. Use B-49 x L/4,, screws. #3 lock_ washers, and B-4g nuts. Do not tighten the serews. ( ) Re^ferring to Detail 4D, mount the right and left endplates to the top and bottorn brickets. Use 6-32 x 3/16" screws. position the screws to the rear (away from the flange) of the slotted holes in the end plates ind tighten. Now tighten the sereu/sthatholdthe circuit board to the top and bottom brackets. WIRING CIRGUIT BOARD TO ...

from the circuit board, connect the inner conductor to AGC (S-f) anO the shield to GND (S-1) of the FM tuning unit. Grip the inner conductor and shield between the insulation and the solder connection with long-nose pliers to prevent heat damage to the insulation. ( ) Connect the free lead of choke RFC-1 to AFC-1 of the FM tuning unit (NS). Use sleeving. ( ) Connect a Bil wire from AFC_2 on the FM tuning unit (S-f ) to lug 2 of ttre AfC s*ii"r, (s-2). ( ) Connect a 3-L/4,, wire from AFC_1 of the rM luqing unit (S-2) to lug 1 of the AFC switch (S-1). NOJ| : Where ...