Roberts R760 Vintage Radio - Blown Up!

[@jamesmdeluca]

Greetings 2: Cotton swabs are available for purchase with wooden shafts and single or double ended for those with a firmer touch.

[@barryfleischer6553]

These radios look so simple but play so well. Very sensitive. Thanks for another great repair. As I always say , I love work, I can watch it for hours.

[@Codeeze]

They only look so simple to the eye because the radio is on a chip! Thanks for watching Barry, glad you liked it.

[@barryfleischer6553]

@@Codeeze You make it look easy because you're so good at what you do and your videoing at the same time. When I'm repairing a radio I wind up spending a lot of time looking for where I misplaced a part. They roll everywhere.

[@greggsvintageworkshop8974]

Great work Paul! Really clean fixes and adding the socket for the IC was very smart. I love the wood finish on that radio as well.

[@gerardcarson2779]

Great video, and really enjoyed it. For a latish Roberts radio these are pretty neat little sets and with such nice wooden fronts and backs to them. I did up a similarly very poorly one last year but went on to spend most time polishing that wonderful wood. Just using finer and finer sandpaper and ending with fine grade wire wool it came up like glass, and I then finished off with several layers of Danish oil.

[@Codeeze]

Thanks Gerard. I do have a soft-spot for these. Yes, they are 'modern', but they still have that build quality about them because of the solid wood. I must admit to preferring 'sheeny' over 'shiny', but I also use Danish (Colron) quite a bit, but more often teak oil. The R760 hascome up really good. I've posted some pictures of the finished job on my community tab... kzbin.infocommunity

[@Plons0Nard]

Suggestion : add a Schottky diode to the external power socket to prevent this in the future. Nice repair, nice radio 👍🏻🤝🏻🇳🇱

[@allthegearnoidea6752]

Clearly they spent their budget on the wooden box to give it a decent burial. Great video always a pleasure. Thanks regards Chris

[@Codeeze]

Indeed they did Chris! Some nice chunky slabs of teak... Thanks for watching 👍

[@michaelclutton8446]

Interesting video, your solder sucker works great, I have one of those Chinese electric ones. It’s more trouble than it’s worth.

[@Codeeze]

Thanks Michael. I have had many solder suckers over the years, including the electric ones (Duratool, Weller etc). The electric ones seem to be quite high maintenance, and aren't always practical in smaller spaces. The Engineer sucker seems to be the best I've used, I haven't had a moments issue with it, it's very powerful. It sits a little smaller in the hand, and that takes some getting used to. I wouldn't be without it now. Recommended.

[@michaelclutton8446]

@@Codeeze I have ordered one of these Solder Suckers, Regards Mike

[@ianallen2]

I made an adapter for roberts radios where the centre pin it the negative. A female and a male socket and plug and wire them up opposite to each other.

[@Codeeze]

Nice one. That would work. There's always a way if you understand the problem first 👍

[@jamesmdeluca]

Greetings: The icons below the band select buttons give a fairly good idea what you get in each position; better yet, the user guides a readily download able. Generic term for Q-tips is "cotton swabs". Forum tips suggest NiMH or Li-Ion rechargeables will fit. Use a schottkey diode to prevent wrong polarity DC input damage. Most wall-warts have center +, but not all. Of course, appropriate charging circuits are needed and available.

[@Codeeze]

I've never got on with the button configuration on these radios, 2 buttons, three selectable bands. The 2 button configuration was a break from Roberts norm. It just takes some getting used to... Some of the later Roberts sets did have a factory diode, but not many. Most Roberts sets of this era are centre pin negative - this catches many out who plug in a generic adaptor (centre+) and in turn it damages the chip and caps.

[@georgebarnes8163]

I noticed that your radio does not have the safety diode that mine has on the supply side.

[@Codeeze]

I did put my own in. The earliest ones didn't have a factory diode - some (and only some!) of the later ones did... Thanks for watching and dropping a comment!

[@georgebarnes8163]

FYI the serial number on my radio is 619587 if that helps@@Codeeze

[@darrensmith6999]

Bought one of these earlier this year got a good deal as i think the owner thought there was a problem with it but its fine, i just think it was that the controls had bamboozled them. Good clean polly watch on the dial and some Danish oil good as new (:

[@Codeeze]

2 switches for 3 bands still confuddles me!

[@Andrewausfa]

That really was a deep fried chip! I think it's bad design that they don't have an idiot diode across the supply and no in your face warning by the power input.

[@Codeeze]

Not just deep-fried, but battered... Later ones did have a diode, I guess even Roberts got fed up with the amount of remedial work they'd planned into the radio at the design stage...

[@iceberg789]

how does ic blow up with a hole on the top, if not subjected to over voltage .. ? 🤔 pl put a voltage reg ther.

[@Theoobovril]

Super job, Code'...

[@driverfilmsshortwavechannel]

Ive seen these on ebay a few times and have never liked the look of them I just assumes the wood was actually that plastic stuff that looked like wood. I like the look of them now! I wonder if they put more than 9 volts up them to make the capacitor cause that much damage?

[@Codeeze]

I like them. Yes they are radios on chips, and there's not an awful lot going on inside the box, but they have a charm about them. Solid wood front & back. I used the Novus you sent for my birthday on the dial face. Thanks for watching Dom.

[@zx8401ztv]

Yep another one bites the dust :-( Lucky that the r.f sil chips escaped damage (maybe a resistor is in the supply feeding them)

[@Codeeze]

It's not the end users fault when the manufacturer (China Roberts) reverses the polarity for brand profit... They must have made a fortune in customer repairs over the years... bad design? or savvy business at the customers expense?...

[@zx8401ztv]

@@Codeeze China Roberts, that's a good description :-D If i knew a customer could mix up the power supply polarity, i would put a bridge rectifier made from low loss Schottky diodes in the radio. Polarity would not make any difference then lol, Yes im evil. I've had customers that killed c.b radios again and again because of reverse polarity. The damage to really nice radios was not pretty :-( Sorry waffle mode.

[@GeorgeChristofi]

Didn't have the decency to burn through the paxolin! Should have got more than soft rubber and wax markings.

[@Codeeze]

Roberts see, built in fireproofing, and waterproofing as standard... Thanks for watching George.

[@barryfleischer6553]

...what are you cleaning the board with?

[@Codeeze]

IPA - isopropyl alcohol 99%

[@barryfleischer6553]

@@Codeeze Ah Ha! and I thought you were using beer!