So, once again, I thought the s<strong>to</strong>ry <strong>of</strong> res<strong>to</strong>ring this classic <strong>Eddys<strong>to</strong>ne</strong> radio <strong>to</strong> its formerglory might be <strong>of</strong> some interest <strong>to</strong> EUG folks. As previously, I have kept the descriptionin brief ‘bullet’ form as I find this is easier for folks <strong>to</strong> digest <strong>an</strong>d have added plenty <strong>of</strong>pho<strong>to</strong>s <strong>to</strong> help visualize the process. In particular, I have included a very detaileddescription <strong>an</strong>d several pho<strong>to</strong>s <strong>of</strong> the disassembly/reassembly <strong>of</strong> the front p<strong>an</strong>el/drivemech<strong>an</strong>ism, plus some tips on this process, such that I hope that it will assist others intackling what could be a rather daunting task with those niggling questions in the back <strong>of</strong><strong>you</strong>r mind as <strong>to</strong> whether it will all go back <strong>to</strong>gether?, will it ever work again? <strong>an</strong>d wha<strong>to</strong>n earth the left-over parts were needed for once the thing is re-assembled?...(!)Preliminary Inspection <strong>an</strong>d Basic Preparation2On arrival (very promptlymay I add <strong>to</strong> the seller’scredit), the radio had beenwell packed in bubblewrap<strong>an</strong>d a s<strong>to</strong>utcardboard box <strong>an</strong>d hadtraveled well, apart fromthe N78 output valvehaving come loose in thebox <strong>an</strong>d with badly bentpins. However, the radioactually looked worse ‘inthe flesh’ th<strong>an</strong> on theEBay listing (pho<strong>to</strong>s 3, 4<strong>an</strong>d 6), though a preliminary inspection revealed that with the exception <strong>of</strong> the rectifier<strong>an</strong>d stabilizer valves (<strong>an</strong>d obviously the case) all the main bits were indeed present <strong>an</strong>d,apart from a dented ‘inner h<strong>an</strong>dle’ (the metal bars that wrap around from one frontchrome-plated grab h<strong>an</strong>dle bolt <strong>to</strong> the other), possibly indicating it had been dropped orhit at some point in its 56 year his<strong>to</strong>ry, no obvious mech<strong>an</strong>ical damage (note: I have nowconcluded that‘dropping <strong>Eddys<strong>to</strong>ne</strong>s’must be a world sport <strong>of</strong>some kind, with thecontest<strong>an</strong>ts eithersimply curious as <strong>to</strong>what happens when+40lbs <strong>of</strong> British metal,glass <strong>an</strong>d electronicshits the ground <strong>an</strong>d/orwhether the <strong>Eddys<strong>to</strong>ne</strong>reputation forrobustness will stayintact even when hit by32
a baseball bat). Worse, it was obvious that a former owner had sprayed the front p<strong>an</strong>el amedium-grey colour (the original black crackle showing through in parts) <strong>an</strong>d,unfortunately, had done this with the front p<strong>an</strong>el still on the receiver with a minimalamount <strong>of</strong> masking: consequently most <strong>of</strong> theinnards <strong>of</strong> the radio had been sprayed as well– wiring looms, chassis parts, front <strong>of</strong> themains tr<strong>an</strong>sformer, parts <strong>of</strong> the IF c<strong>an</strong>s,resis<strong>to</strong>rs, capaci<strong>to</strong>rs etc, even the <strong>to</strong>p <strong>of</strong> thetrimmers in the coil box – what a mess! Oncloser inspection, I noticed that one <strong>of</strong> the dialbulb holders was <strong>an</strong> incorrect type (screwbase) that had been ‘encouraged’ <strong>to</strong> fit withplenty <strong>of</strong> insulation tape <strong>an</strong>d some ‘hockeytape’ for good measure (this being C<strong>an</strong>ada,what else?), <strong>an</strong>d it looked like it had shortedout <strong>to</strong> chassis a few times. <strong>The</strong> tuningmech<strong>an</strong>ism, rather th<strong>an</strong> having that silkysmooth <strong>Eddys<strong>to</strong>ne</strong> feel, was almost <strong>to</strong>tallystuck, <strong>an</strong>d when it was turned (forced), Inoticed that the tuning g<strong>an</strong>g was not moving.Examination revealed that this was due <strong>to</strong> the‘ratio arm’ mech<strong>an</strong>ism being missing. Thisshould comprise two small springs attached <strong>to</strong>a cr<strong>an</strong>k on the end <strong>of</strong> the tuning g<strong>an</strong>g, holding a spring-wire loop in place that retains thecr<strong>an</strong>k against a small ‘boss’ located eccentrically on one <strong>of</strong> the tuning mech<strong>an</strong>ism gears(pho<strong>to</strong>s 6 <strong>an</strong>d 21). However, peering in<strong>to</strong> the grime very closely in this <strong>are</strong>a <strong>of</strong> thechassis revealed that the spring-wire loop was laying on the chassis, retained by fluff <strong>an</strong>ddead spiders, but only one spring was found <strong>to</strong> be still affixed <strong>to</strong> the tuning capaci<strong>to</strong>rcr<strong>an</strong>k arm. <strong>The</strong> ratio arm is a clever little device that ‘linearizes’ the otherwise non-linearreadout on the sliderule dial – the ratio arm was one <strong>of</strong> Bill Cooke’s pet inventions, <strong>an</strong>drightly so – simple yet very effective (page 12 <strong>of</strong> ‘<strong>The</strong> Cooke Report’ on the EUG site).<strong>The</strong> serial number <strong>of</strong> the set(pho<strong>to</strong> 5), GB0355, indicatedthat the set was either made inJuly, 1950, according <strong>to</strong> myinterpretation <strong>of</strong> the serialnumber information on Al<strong>an</strong>Clay<strong>to</strong>n’s <strong>Eddys<strong>to</strong>ne</strong> website(www.qsl.net/eddys<strong>to</strong>ne,5though this site is currentlydown <strong>an</strong>d under revision), orFebruary, 1955, according <strong>to</strong>the EUG Quick Reference Guide (QRG), page 26 (always assuming the letters werestamped the correct way around in the first place! – app<strong>are</strong>ntly not always the case). Isuspect it was the earlier <strong>of</strong> these two possible dates <strong>an</strong>d my set was probably from one <strong>of</strong>43