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Farther work entsile removal ofthe exbinet, which is secured by {he four large serows se the rer. Everything being normal, the tuning Indlator wil glow soon ater Ewitehing On. this does not happen, fault exits and the contine ty ofthe heater chain should fac be checked, to mcareain there iran open circuit hestor or fuse : ‘When carting valves by substitution, 1 necessary that ehe fl number sf valves ar inthe holders, * “Connect, Note there les reset (R37) In pa Sf the OM70 Tuning inleacor, to equate te current. ALIGNMENT. ‘The following istructlons are based on the assumption that the Teceiver hat fuffered no major misalignment ‘Although minor sdjustmones may be earied out without chem, ite Getinicly more ssactory, for proper alignment, to. Use’ tert Instruments, the following being essential = 40° Signal Generator, fitted with calibrated attenuator and having ncarnal modulation, The frequency range should cover that ef the receiver and. the Intermediie frequency. The Signal Generator should: preferably be isolated with “C1 oF condensers; 1 megohm fesitor being connected erost the fcads, on the receiver side, to ensure O.C. contnulty.- For the sake of brevity the Signal Generator is referred to in the following notes asthe Sig Gen, When aligning the RF. sages, dummy aerial, sultable for high frequencies, should be Inter: posed beeween tho direct output of the generator andthe eral cerminals of the receivers. Should no dummy aerial be Supplied with the generator, 2.400 ohm ‘carbon resistor will ferve,fitiod in series with the high potencial lead 2. An augio output mecer, calibrated in milivates and decibels fo match an impedanes of 5 ohms. 3. A nonmetallic trimming tool. with a screwdriver shaped end, for adjiting col cares, et The Edéyrone Cat, No. 87 ‘The receiver should be removed from ies cabinet (by unscrewing $e four sFews at the reir ad stood 0 hand en, face to the operator, taking care nat to damage the speaker. Connect the sutpue meter aerate the speaker tetminalsylesving the speaker connected, ay thir I help LF. CIRCUITS. The intermediae frequency is 450 kc\s. The LL. Transformers are. well designed and constructed and are unlikely to drift off requency ‘over long periods. Before commencing alignment, allow the receiver and the Sig. Gen. © warm up for at least ten minutes, co minimise frequency dre Set the Tone and Volume Controls fully clockwise and Selector Switeh to Band 4 The Sig. Gen. leads should be clipped, one to the stator of the centre section of the gang condenser, the other to the coll box Easting. The Sig. Gen. should. be adjusted to 4 frequency of 450 els. 30% modulated, with the attenuator set to give an ‘output In the region of 100 malcrovoles, ‘Then proceed to adjust, with the insulated trimming cool, the cores In the Lf. Transformers, The Sig. Gen. output should be Feduced ar necessary. When maximum output har Seen secured the ateenuator should Indieste less than 70 mlcrevolts for 3.80 hlwate output, 2s shown on the meter with the speaker di Connected. Should the attenuator reading” be higher than th {eis possible that the valve emission lt beginning to fl RF. AND OSCILLATOR RE-ALIGNMENT. For the sake of completeness, the instructions which fellow give the Whole procedure, for realignment. of the radio frequency, frequency changer and orcllator sections. It ls emphasled, how: fever, that usualy all tha will be necessary Is slight adjustment of the ‘trimmer condensers and this operation ean be exrried out without removing the cover of the coll box. In the frst place, therefore, only thove Inserustions. in the following paragraphs Sealing wich etimmer adjustment should be attended fo. if the Mignment Is still not wholly satfaccory, the coll cores may be Adjusted, but considerable cara Is called for to ensure thae proper ‘racking Is malneained. OSCILLATOR STAGES. (On each band, the ofiltorfeequency i 450 kel. higher than the ign frequency. ‘The Sig. Gen. leads are connected, via the dummy aerial to he Aerial and earch terminals Remove the lid of the Cll box, taking ire not to drag ft across the smal trimmer condensers, 10 Wold ‘mage co the Smal anes. Adjust te ening 0 12 Nj. on Sad 1, and ae the Si. Gn, to give an output of 30 microvols (or less) on the same frequency. itis desirable co point out here that very few Signal Generators are tallbratea to an accuracy of beater than 1%, whieh means. In ractice that ata setting Of 12 Mes, the frequency may be plus or Frias 1a0 Key. nerve: Woy aval duceopaey found Betwaon ehe Sig. Gen, ealbration snd the receiver cloration, willbe well not to readjust the otllator frequency. To ensure Shsolvtely correct calibration, eis necensry tose & Crystal aerator, meorportng s ose slerance 1000 ce, Cyt forthe nal Seeing St the oxciator brea Ie found naceeary,thersfore, tnd maximum output i ngieted. Euning poiner t9'8Trequency of 4 Mels and trim Core No: & ‘Then proceed to Adjust Core No 9 on Band 3 at 600 ke! Sena 160 kes A similar procedure is followed at the higher frequency end ofeach band, using the frequeneles st ou in the panel below, but this time adjurting the Trimmer Ecndonsers” On Bands 1ang'2 (ae and'9 Mes fh Setngs ofthe erimmers at whieh the signals audible the correct one swith he {Slmmercapoalance al lowest sting, ceed to adjust Core No. 3 until the signal ie audibfe change t2 Band 2, adjust Sig. Gen. and "and Core No. 12.0n Band 4 with the Si Te may be possible to find eo mnce- © @O® Band Frequency ‘Ore. re RE 1 2 Mea 3 2 1 VOLTAGE VALUES “The voltages are between the points indicated and ‘cones a 4 Mele £ s 4 haus (except poine “US. Set aiten “to Binds “Shore ofe aero tach set volume 3 00 kes 2 8 7 onerol at maximum ang the tone control fully Sachs 4 10 kets 2 " 10 Values ae given for A.C. inputs of 110 and 230, |= volts, using two types of meter. It will be evident 1 wore [3 2 1 that the Scusi Yolage Indieted depends upon the partiealar meter employed. A tolerance of 1 Should bellowed on the values given. TRIMMERS 2 9 Me 6 5 4 3 1a Me 3 8 7 en 4 320k 2 1 0 fet ae | ee ‘The adjustments ofthe corer and trimmers affect eachother slighty and cs therefore a Advisable to repent the foregoing procedure once er twice, SE] ae? | oe? RF. AND F.C. STAGES. e| “Tho procedure adopted in timming the radlo-requeney and frequency changer El bh | 3 Input cireuits fs very similar to that deseribed above for the osciisior stage, For a) oR | 8 trample, on Band 4, the receiver ls tuned for maximum ougpuc on the meter with Pace) the Sig. Gen. set at 160 ke) the attenuator being adjnted fo provide a reatonable ey ge | Pesan. Carer No.1 (EE) and 10 aoe Chen et oe me aceenable k) & | 8 ince, El oe 1 At the high frequency enc of Band 4, a frequency of 320 kc/s. is employed and g| ih | ‘Timmera Nios tt and 10 agjusted for peak sutpet, As withthe oacliaver the foe le | sl ge roer shoul be rept | Misc | He pel 1 scl 8 gc] Replacing ehe ld of the coll box wil cause very slight alteration of frequency at | TRAC) “rke] “ihaAe) "Y}sRe] the igh frequency end ofthe bands but ie mil ony betapprecible on Bands and 2- ‘Aturther sighe readjustmenc of Trimmers 3 sna 6 will eorsctthis-—the enimimers fare accessible through holes in the lid ater it has bean screwed in positon.omen 400g Sorel 1 Hoo faeet Sern as @ a) wan ‘ePHON| ravny ‘SATA ait |e