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Transistor Radios reparieren – eflose #874

Transistor Radios reparieren – eflose #874


Hi guys, this is the Super Knips 64 radio,
I stuck the ferrite core here, me believe there you can see it, I have the
glued with Pattex Power Glue because superglue then it breaks again, superglue is
too fragile so with Pattex that holds some measured, then pushed the coil back on,
the wax with which the coil was attached that’s the best way to get away
I light the ferrite core with the lighter warmed up, then the rotary capacitor
he had a conclusion here at the end I bent the sheets slightly apart
that will be back. The radio itself I have 2 days on the laboratory power supply
had and the voltage from 3 volts to 6 volts slowly turned up high here being the red cable
Minus is and the black is plus, there must be be careful, the red minus the black
Plus, it’s something, yes, of the colors exactly reversed verkabel. The germanium transistors are still whole
ok, the Elkos but seemingly very Lost capacity. Then I would say … you can already hear something … But … the ZF is swinging, that points to Elkos
down, on Elkos the AGC scheme that’s not are more good, the radio is from 19 .. of
at most 1964 that is the Elkos are already over 50 years old but very interesting
is the air rotary capacitor, something like that is really interesting but he does not make a short circuit
more that would be heard than cracking, the had a short circuit here, now he has
no more but here you can hear, you hear the swinging ZF, we have day there is the
Medium wave not so good, that’s the camera, yes, that’s the camera … a medium wave transmitter
we have the camera here, the camera sends on medium wave, yes that’s the camera so
the recipient is very sensitive, here in the lower part of the ZF does not swing … There we have
the transmitter again … But here the ZF is swinging, I think you can
hear it when I turn back and forth … one swinging ZF … I think one or the other
Elko is still bad at that but I leave Just as it is once. This is how the radio looks packed, with the stretcher
Strap that’s torn here but … here the volume and here transmitter setting,
and here the marks a mark here and a marker here are to
there, in the US you should look at the frequencies if a nuclear war breaks out
about it information sent on the frequencies … Well, we have day there is on medium wave
not much to receive … But the radio is sensitive enough … yo … There is our camera again, the camera receives
the there. Now I have formed this radio too
So I had it on the laboratory power supply and have the tension within 2 days
slowly turned up to 9 volts and, You can hear a tack tack, I can adjust the volume
turn up but there is nothing to hear. I checked if the local oscillator
vibrate with the oscilloscope and it vibrates, well, now I have a circuit here
connected like I did at Rexina Radio made such an audio amplifier,
it hums easily when I touch here, there I have a loudspeaker box, loudspeaker box,
Audio amplifier with LM386, very simple Circuit so standard audio amplifier circuit
and with this I can now listen to the radio palpate and there I can look, several
Filter, I have it on FM now, I am now on FM and I can now look
So the FM local oscillator oscillates, that I’ve already checked, the AM local oscillator
is powered by the transistor, the FM I believe by the one or the other, I am now
not sure I do not have a wiring diagram to the radio, then we have a germanium here
Diode but I do not think that it demodulates Diode is, then here is a germanium diode
and here’s another and here’s one more, now I can see, where is the audio signal
Actually, I do not measure anything then, too nothing, nothing then here … ah as received
I what if I have contact, ah, at this So diode is an audio signal, there is a
FM audio signal and on the diode here too, those are the 2 for FM well,
aha b5 Currently, I can see where is that going on, that’s going on around there,
ah, that’s loud so it’s an audio signal ever there, an audio signal is already
because then here on the transistor when I’m there go to the base, make it loud, I think
which also has audio amplification only comes no audio signal, let’s see, ah, there
is the audio signal and after the Elko, there nothing comes through the Elko, very quiet,
quietly, in front of the Elko, in front of the Elko … In front of the Elko very loud audio and after so
through the amplifier and after the electrification … somehow nothing comes out, that is
the Elko is broken and that is a … think a 10 uF, yes 10 uF 6 volts and have here
a 0.5 μF 6 volts, again exactly 0.5 μF 6 Volt and the ATP, ATP Elkos,
ATP is not an auto parts manufacturer company or an auto parts sales company? In any case, this Elko is the left of the
20 μF broken, that means for me me may disassemble the radio. At the transistor, ah, there comes out of the speaker
a noise rustling out, that’s probably the Base, collector nothing, emitter nothing but
Base, base comes then noise. Ah, ok, wait, if I use the two with the
Screwdriver connect, ah, the audio is ever there Ah, that’s the way to check, so
the audio, the transistor works, the amplifies the audio to the one who controls
the two push-pull on, that goes on it, ah, there’s still some feedback,
So a negative feedback back to the power amplifier and here over the other yellow wire here
comes the audio signal and there we have it a transistor of which transistors are
many are broken, these are one of the first silicon Transistors here that are so shed up,
they like to break but it seems to be safe in the radio because we have here
a strong audio signal there, for me that means the whole board has to get out of that
I can swap the electrics and if I already I’m not supposed to swap at the Elko
just swap the one but the one and the other Others too. That means, the 2 screws unscrewed,
they are here and here and the whole chassis take it out and turn around, luckily
I do not unplug the cable, luckily here, now I come on the soldering side ran
I hope I have to trade the two Elkos, Can I get there for soldering without the down
to build? Yes, I can get there for soldering, the Elko
swap and the other one so I have to go here solder the 2 and solder here around the Elkos
I’ll go there without dismantling to have, yes I’m just coming, ah,
If necessary, you just get there to solder, only if you have to solder under the wheel
would be stupid, we have under the wheel Elko? Do not think so, I do not think so, no, under
We do not have any Elkos on the bike, good. Then I can do that to me now
Exchange 10 μF and the 0.5 μF electrolytic capacitors. Well, I have now replaced the two Elkos
by other Elkos, other Elkos same capacity, which have higher dielectric strength and
now… Ah… Somehow… That’s the whole FM band? It looks more like spread … But seems
to work now with the new Elkos, so the other Elkos still exchange … So, I’ve tested the 10 μF Elko times
and that is recognized as 78 pF, 78 pF though which should have 10 μF v6 volts, that’s 78 pF
really little, again, 81 pF, man, in the pF area is that, then the 0.5 μF Elko, check it out,
who has, can not measure, again, times really pure, 0.5 μF should
who have, yes he has nothing at all means the Elkos are completely dried out,
I can also put it in here, 0.5 μ, which is not measured, the 0.5 uF
has nothing and the 10 μF, the 10 μF should have, let’s see, the bring
I do not like that, I have to change it measure, I have to put in there, the
I have to put in it … 10 μF is the have and he has 82 pF ok, then the others
Elkos from the radio, I think that are broken too. So ok, I changed all Elkos now,
the one Elko was a little tricky there I have to measure what polarity
because he is real, the original Elko no polarity specified, at all
no and the pin was nasty to unscrew, he is soldered here, goes over the board
continue, make a bridge and still at one another place, the bridge I have there
inserted, an extra wire bridge now, yes, and there is nothing on the Elko
on it, I do not know what value who has, but he has such a film around but one
Transparent film and in the component tester if I measure it then shows the at 114 μF 3.5
Ohm, I soldered a 100 μF because I think that 100 μF comes closest
and the pole right to the voltage. So, then we have 1 2 3 4 5 6 7 8 Elkos the
I changed on the radio, I will which measure all times again, we start with
first 10 μF electrolytic capacitor, 10 μF first once get into the component tester,
10 μF should have, let’s see how much the first one has 24.91 Mega ohms
Resistance, 24.91 Mega Ohm that has indeed no more capacity, test again,
the Elkos are formed, yes, 80 pF 24 Mega Ohm ok, so that’s a 10 μF, has 80 pF. Then the second, also a 10 μF, here, 10
μF, let’s see how much has left, the second 10 μF, which has 18.25 μF that would be
even ok but 12% loss is already a lot of. Ok, that would even have capacity, then
the third, which would be 0.5 μF, 0.5 μF, the take a look, try it, 0.5 μF should have,
he has nothing, yes, he is right in there, 0.5 μF, he can not measure that is
finally broken, the next 0.5 μF, half μF, testing, also unknown, the 0.5
if he can not measure, he is also open, ok, the next one has 10 μF, 10 μF, that has
He should have 10 μF, but he has 19.3 μF 11% loss, ok, but it still has capacity
the next one has 50 μF 10 volts, let’s see whether the 50 μF has 243 pF which, again,
244 pF, which is completely dried up, He should have 50 μF, he has 244 pF, the next one
a 0.5 μF, yes the Elkos are somehow almost all dried up, that has 2, 2 μF so 2049
nF, 2 μF somehow, that’s way too high 0.5 he should have 2000 nF so 2 μF has the,
he has 2 μF, which has 4 times as much, yes the has 4 times as much as he actually has
0.5 μF 2032 nF that is 2 μF, the has way too much, so it has way too much
and also 14% losses, way too much losses, so 3 still have a little capacity and
the 4 have no more capacity and the here is probably still capacity but why is
the un poled and has nothing on it, he still seems to have capacity and 114
μF 3% would be even good, ok, then we have 4 Elkos that maybe still good
would be and 4 you can totally blow away in the radio. Well, the radio is working again, that is
on FM … It is very wide on FM … Or is that, ne, AFC has not right? Or, AFC has that, AFC has that … It has AFC on FM, Ah, so that’s how it works
wide … okay, it works on FM switch to AM times to AM, to AM, well,
I’m running out of battery, believe it that, no, that’s 455 Khz, turn off
then the ZF does not swing if I do not 455 Khz carriers have, medium wave during the day
is not great but it works. So it looks like now in the shell and that
Super Knips that also plays, on very wide, OK

13 comments on “Transistor Radios reparieren – eflose #874

  1. Richtig gutes Video, es ergibt ein super Verständnis zu den Makierungen, wenn es zu einem Atomkrieg kommen sollte.
    Auch wenn es nur für den Amerikanischen Radio eingestellt ist. Ob es auch eine Makierung für Deutschland gibt?
    Die 6V 0,5µF und den 6V 10µF, könnte man gut gegen 16V 22µF Tauschen 🙂
    Auf der Unterseite der Platine haben die an Lötzin nicht gespart^^

  2. Elko Kur, bewirkt doch so manches mal Wunder. Ich habe noch 6 TV Leichen aus den Ende 50er bis Mitte 60er Greatz, Schaub-Lorenz, Nordmende. Da sitzen noch die Dicken Lakritz Bomben drin. ca. 50 Jahre nicht mehr gelaufen. Wenn mal Zeit ist, werde ich die Geräte nach und nach wieder zum leben erwecken. Sind noch Allstromgeräte, wo volles Netzpotential auf dem Blech Chassis anliegt. Glücklicherweise habe ich einen Regeltrenntrafo für die Schätzchen. Da habe ich so Richtig Lust drauf. Leider fehlt es an Zeit. Aber deine Videos, lieber Robert, die Fixen ohne Ende an. Top! Einer meiner Lieblingskanäle!

  3. Hi Eflose ! Dachte ich es mir, Du bekommst die Schätzchen wieder zum Leben erweckt !  Toll gemacht. Interessant, dass die Amis sogar eine spezielle Markierung für einen Atomangriff auf ihren Radioskalen haben. Da sieht man mal wieder, dass die Amis ein schlechtes gewissen haben. Kein wunder bei den vielen Kriegen, die, die ega in anderen Ländern vom Zaun brechen. Na das zweite Radio dürfte ja dann für dich kein Problem darstellen. Das Baby machst Du bestimmt auch erfolgreich wieder heile ! 😉

  4. Du bist ein echter Radiodoktor ! Das finde ich total süß, dass Du die Geräte alle wieder zum Leben erweckt hast ! 😉

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