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How To Flashing sansui sa53g

av reciver sansui eight deluxe has one of the most complex costructions and the best components, compared to other devices from that time they have much in common with more modern constructions, for example fm head similar to that in model tu-x1 switchable resistor ladders in eq section, same were used in amplifier, model au-999 in the same amp were used very similar power outputs in general it’s the highest av reciver model made back in the day, and with the best sound in my opinion previous version of eight deluxe is model 7000 same caseing, same look, switches and knobs setup difference: power outputs, power supply block, little smaller radio tuner block

this here of course needs service, have never been repaired all components in here are original, ile it was out of the box the biggest problem here are not potentiometers or knobs, but switches here after pressing low filter, high filter, load, it causes pauses and interruptions in both channels switches have to be fixed everything must be cleaned and of course fm tuner has to be adjusted lack of covering between scale indicator and frequency is a standard in old equipment detector’s zero too

all of that is because of old electronic elements here is simple test let’s set detector’s zero signal level is lower now when everything is adjusted properly, this pointer has to be in the middle and signal level should be the highest if stereo light flashes, and signal has maximum level, detector’s pointer is tilted to right, so tuner needs adjustment construction separate fm head separate capacitor for am tunning, so very good solution

similar is used in high class recivers mad by marantz, for example 22-75, 23-30, 23-85 separate modules for fm and am tuner and here stereo decoder power outputs construction is dual mono so we have transformer, power supply filter low-impedance capacitors perhaps their volume is not that high (8000âµf) but they have low impedance so that counts power output for left and right channel so it can be said that it is dual mono, in short later i show other interesting things that were used in younger devices here i have another reciver, model 7000, i haven’t finished service here yet switches/knobs set is identical, as well fm head and am tunning capacitors

very similar stereo decoder module i think used transformer is the same too, but because it’s diffrent power blocks set, it has three capacitors here one is for power filter and other two are for speakers outs, separate transistors and amplifiers out as i said, 7000 is prior to eight deluxe bottom of the reciver as i mentioned, eq uses resistor ladders, which are used until today in the highest class equipment eq plate, power supply elements, and source switch that switch is shielded with metal plates to prevend crosstalk between channels one more interesting, in my opinion, thing is the amount of turnes required to scroll through scale

form far right to far left and vice versa, which is quite high compared to other devices it gives us much better precision this model is very well made, also quite heavy, not sure but around 15-20kg i’m guessing here is hidden preamp this model has one thing thad 7000 does not, it’s module responsible for shutting down speakers if constant voltage is detected on output it eliminates cracks and distortion when turning device on/off, also protects speakers from any damage which can be caused by damaged output transistors just like in 7000, there are two radiators for heat dissipation it’s the first time i can disassemble this particular model, i didn’t expect that power transistor’s cover, which are here on side

and are nearly invisible, because are covered by this piece, are made of die-cast aluminium glass instead of plexi aluminium front, without a scratch such device 40 years old is nowadays a rarity here on power amp plate, those two capacitors supposedly could be replaced due to high temperature generated by this high power resistor in such enviroment elements can age fairly quick so they have to be checked same thing goes to power supply capacitors, on bottom it’s a bad thing in almost all devices, placing resistors and transistors on bottom, because it causes heating of those elements common fault are those plates on buttons

they are glued with butapren which ages and plates can fall off now everything looks much more interesting, we can see how it was originally built preamp, buttons, scale parts, metal parts... here’s gramophone preamp input, has dirty contacts, those switches too i’ll disassemble them and clean source switch, all has to be repaired it will be a bit complex process, there’s a lot of wires here, and i have t put apart every single piece but back in the day people were putting a lot of effort to build such device some more switches, “ladders”, speaker switch

it’s the worst part here, disassembling parts and cleaning them, then putting back together service is almost finished most time consuming were tuner adjustment and cleaning all parts here tuner works perfectly, no knob is allowed to crack, interrupt signal etc. visually – new service is fully completed what i did: adjusted fm tuner, cleaned everything i could, setting up bias and 0 dc parameters fixed all potentiometers and switches, replaced some lights, some capacitors contact plates in fuses, and one speaker connector

time: around 22 hours thank you for watching