I'll join the chorus by stating the obvious, another excellent repair video, which demonstrates methodical troubleshooting and problem resolution (at their best). Great germanium to silicon re-biasing primmer/tutorial!
@sulagodfrey-jensen813
4 жыл бұрын
I had this radio when I was a Peace Corps Volunteer in rural Brazil in 1965-67. I loved it for local AM and distant SW reception. I hooked up a battery operated turntable (adding a phono input across volume control). I gave it away when I left so I don’t know how it lasted. Thanks for showing me this set again!
@MsCori76
6 жыл бұрын
I could listen to the time on shortwave all day long. I so miss it here as Australia ceased it I think in 2001! :’(.........Also Shango, Thankyou for allowing me to hear the time on shortwave in this video. Took me back to my childhood & past. :) xoxo
@MsCori76
6 жыл бұрын
Love the song @ 20:51, “Always Something There To Remind Me” :)
@RODALCO2007
10 жыл бұрын
Great repair and bias explanation video. Excellent job ! That tuning gang seems a bit wobbly as well. That is a great radio. good sound.
@markashley5074
3 жыл бұрын
Oddly, at this point, the audio on AM is much better than FM. Great work .. love your vids.
@wrnchhead76
2 жыл бұрын
Yeah if you like listening to nut jobs spew disinformation
@Pwaak
10 жыл бұрын
I appreciate this repair lesson/video very much...Thank You!
@johnyoung4039
3 жыл бұрын
Awesome job! To re engineer a circuit like that, What an awesome job!! The radio sounds Great!! I truly wish I had your wisdom!
@craignehring
8 жыл бұрын
Recent subscriber, love your expertise and commentary.
@budleyca1
10 жыл бұрын
Great job, that's a radio worth keeping, now if you could only bring back good music to listen to, instead of that shit that all the stations play now...
@georgeiron8399
6 жыл бұрын
You are very talented, great job on that beautiful radio, i wish I knew how to do that stuff!
@stevenking2980
9 жыл бұрын
I have a GE p780, paid 10 buck. Great video there shango. Enjoyed it again today! S
@Neilrrc37
8 жыл бұрын
Nice old radio!! It's a keeper..
@RODALCO2007
10 жыл бұрын
Those heat-sinks were touching.
@josephsirois2353
6 жыл бұрын
Awesome video , should explain in more detail about how you arrived at the new bias resistor values
@Farmradio
10 жыл бұрын
This explained the principle of having the transistors conduct just a bit, the "quiescent point", like idling, then it can handle the AC signal. Never had to deal with a germanium rebias yet. This GE came out real good, & still 17 transistors.
@maincalandar7434
6 жыл бұрын
good stuff here, thanks on the play by play changing out Germaium for silicone then properly compensating. Properly showing how everything is in relation to everything else in electronics design and repair, that functioning properly is a series of compromises. Where do you get all the great old tools? Decade box, cap tester, etc?
@williefleete
10 жыл бұрын
Sounds like you got a NZ station near the end of the SW2 dial
@MsCori76
6 жыл бұрын
william fleete - Yeah the woman’s accent sounded NZ not Aussie.
@jasonmushersee
10 жыл бұрын
Better than new. Yeah bring back some good music. Around here it's 24 hrs of katy perry.
@MsCori76
6 жыл бұрын
jasonmushersee - That would do my head in listening to her all day!
@ArthurHollingsworth
10 жыл бұрын
That certainly is an impressive radio. I wonder how it would do if you took it out of town and did some AM DXing with it. I'd bet it would do very well.
@THEtechknight
10 жыл бұрын
Too bad what they play on the radio these days "as music"... isnt.
@markmarkofkane8167
5 жыл бұрын
Straight on!!!!
@MarkShannonroad_videos
10 жыл бұрын
Nice radio.
@fredfabris7187
8 жыл бұрын
I wish we could see a schematic, I'm interested in what resistor your tweeking.
@LakeNipissing
7 жыл бұрын
18:28 . . . Very appropriate song: "Turn down for what"
@LakeNipissing
7 жыл бұрын
For bias of course!
@LostinMND
10 жыл бұрын
Sounds good. I question on how it will sound when the batteries get weak. Will the audio still be fairly clear? Being the original transistors were germanium require lower biasing resulting clearer audio under lower voltage. Check the sound quality at half battery voltage. Is it still clear? Good ideal to stick in the old parts incase someone down the road would want to put the radio back to original. I have done that my self a few times after doing a mod.
@Grobbekee
6 жыл бұрын
Why not look at the schematic and calculate how it is biased with the old parts, and then calculate the bias again based on the new parts. Voltage drop for Ge and Si are well known. Hfe ?See datasheet. No need for experiments with a meter and variable resistors.
@trieck
6 жыл бұрын
Grobbekee I agree! I don’t understand the trial and error approach when the correct values can be found with a datasheet and a little math.
@killcar5nbike2
6 жыл бұрын
For the silicone bias transistor wouldn't the emmiter and base node would need to be seperated and configured more like a Vbe multiplier. That germanium bias circuit relies on leakage the silicone bias transistor doesn't have. With the emmiter and base tied together as there's no way of applying the 0.65v B-E on the bias transistor surely it won't turn on?
@Monstrosity285
8 жыл бұрын
The transistors you installed don't have a heatsink, its a mounting bracket for a heatsink that attaches with a screw/bolt
@shango066
8 жыл бұрын
+Monstrosity285 No need with Si, not as temp sensitive and and unstable as Ge
@carlrudd1858
9 жыл бұрын
When you first un-boxed the radio, there was an empty HOLE where the antenna went. DID I MISS the segment on replacing that, or was that just deemed uninteresting ???
@8800081
7 жыл бұрын
love your repair videos but when you're tuning the radio stations please don't stay of the ones with rap! LOL thank you very much
@fredfabris7187
8 жыл бұрын
Where are you measuring the 600mv?
@benjaminsebastian9241
4 жыл бұрын
I have a GE world monitor. the audio has dropped off. How much do you charge to diagnose?
@fredfabris7187
8 жыл бұрын
Where is you ammeter connected?
@jim8230
9 жыл бұрын
FYI: FM only goes down to 50Hz.
@rfburns5601
10 жыл бұрын
Neat old radio - cool retrofit w/ silicon. I have a Panasonic RF-2200 which is similar in design to this one. I don't think AM & FM broadcast performance of the RF2200 is as good the GE (fewer IF stages). The shortwave performance on the 2200 is better in that it uses more IF stages and is double conversion on SW. But most of these consumer radios with unusually good sensitivity suffer from overload and poor image rejection. But hey, its a consumer radio, not a professional communications receiver. Oh, by the way did you check the ion trap?
@rfburns5601
10 жыл бұрын
But of course instead of using an ion trap you can spray the speaker with silver metallic paint (aluminum particles for the pigment) to stop free electrons from those evil silicon output transistors from eating holes in the speaker cone. Ha!
@robertdixon6536
6 жыл бұрын
The video was very educational, but the distortion renders the radio unusable.
@jameslobell5783
9 жыл бұрын
Seems like a little circuit analysis up front would have shortened this video substantially.
@c.brionkidder9232
5 жыл бұрын
Hindsight is 20:20
@cliffjones7868
5 жыл бұрын
Really not interested all the wasted tuning. Would like to see the modifications to the schematic.
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