Heathkit RA-1 - Initial Test and Setup

25
() Insert all valves in their respective valveholders and secure with screening cans and retaining springs as in-
dicated in Pictorial.
{ ) Place a 500 mA fuse in fuse holder FS on underside of chassis,
( } Install a 1.6234 Mc/s crystal in its crystal socket and the 1.6197 Mc/s crystal in its crystal socket.
This completes the assembly of your receiver and it is suggested that at this point, a thorough check is made, to
confirm that all steps are in accordance with the Manual and that all joints are properly soldered, You shauld have
a 150 KQ resistor (BROWN, GREEN, YELLOW} and a 270 KQ2 resistor (RED, VIOLET, YELLOW) left after com-
pletion. Place these to one side for they may be required for subsequent adjustment of BFO injection.
INITIAL TEST
( }) Locate the octal socket and octal socket cover. Referring to
Figure 6, connect one bare wire link from pin 1 to pin 8 and an-
other link from pin 6 to pin 7. Solder all connections.
— —
H ‘] +] f] -~ +
Connect the mains supply lea a
Examine connections to ensure no frayed ends of leads are pre-
sent ta cause accidental short cirewits. Use 24 mm. sleeving.
( } Fit the cover to the socket. IMPORTANT: THIS MUST BE
RAW GSR ty Tn AT TOO ATTAATOS ATT PART TM Gace rom
DAA OY OT L1iMD Ab LonA Lio AD NEAL Lt Ow
CONNECTIONS AS MAINS VOLTAGE IS PRESENT AT TAGS,
( ) Comnect a short wirelink between both terminals of the MUTE
tagbéard at rear of receiver.
BARE WIRE
LINK
. . . BARE WIRE
( } lf an ohmmeter is available, measure the resistance from MP2 LINK
to chassis, After approximately 30 secs the resistance should
be 30 KG or over. If itis lower, refer to the section IN CASE
OF DIFFICULTY.
end of the 50000 resistor (from PA1) to TH2
ial 5.
22, MM/
-( ) Set all front panel controls aa follows: - SLEEVING
AF GAIN OFF FIGURE 6
RF GAIN Maximum clockwise
BFO mode o
BAND switch 80 metres
NL MIN
AVC OFF
BFO OFF
{ ) Place theveltage selector plug in the correct tap point to suit your local AC supply voltage. The mains voltage
; selector board is situated on top of the mains transformer.
( ] Connect a 3% speaker te the speaker terminals at the rear of the chassis.
—
—
Fit the octal socket ta the octal plug PS at the rear of the chassis.
( } Connect the mains supply lead te an AC mains supply point.
( ) Turn the AF GAIN control to the 12 o'clock position. The dial pilot lamps should light immediately. If this is
not so, switch off immediately and check heater (HROWN) wiring connections. If bulbs light, the valves will
light up slowly. After a few seconds, a rushing noise should be heard in the speaker when the AF GAIN control
is turned fully clockwise. If these conditions exist, proceed te the sections FINAL ASSEMBLY and INSTALLA-
TION AND OPERATION, [f these conditions do not exist, disconnect from mains supply and refer to the section
IN CASE OF DIFFICULTY.
GLOUCESTER
ENGLAND
DAYSTROM LTD.