Mystery Radio Revealed Part 1 (HMV A13B)

[@slawnski]

Bravo! Another great video. Thank you for taking us along! I’ve got a lot of catching up to do regarding your previous videos. Looking forward to them and to part 2 of the little nipper.

[@DavidTipton101]

Hi Jim, so glad you are enjoying them, thank you 🙂

[@matteopomarico6802]

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[@docholliday3150]

Enjoying your video. There is a video on youtube showing how to wire in a cheap digital meter to your variable AC power supply. It will then display accurately Volts, Amps, Watts and Power. It also makes it much easier to accurately dial in voltage gradually. I have the US version of the one you have and that meter is almost worthless and is a common complaint. With the digital panel wired in, it is very user friendly. Best, Doc

[@DavidTipton101]

Hi Doc, That meter has been consigned to the bin, I have a much better set up now, thanks Doc 😃

[@984francis]

Ah. But the great secret of radio restoration is that the job isn't done until you've poked a hole in the speaker😬

[@DavidTipton101]

@@984francis that's my motto 🤦‍♂️

[@grahamserle7930]

Today was archive time and you haven't lost your sense of humour. It started so well that I looked up the meaning of “Facetious” and it says; “For David to say that luckily something has been expertly repaired when it really hasn’t”. How appropriate I thought. I'm sure this HMV radio was a bit of a head scratch and I'm looking forward to Part 2. You've come a long way since this video with the audio and production quality so well done on that. Hope your break is serving you well, Cheers, Graham.

[@DavidTipton101]

Hi Graham, thanks. Yeah, sorry, the early production was poor. I had to learn how to repair radios and make a decent video at the same time. I goes to show if you throw enough money at something it will improve, just don't tell my wife 😄

[@grahamserle7930]

@@DavidTipton101 I promise that I won't tell. I'm deleting [e-mail] as we speak.

[@DavidTipton101]

@@grahamserle7930 Haha... thanks Graham 👍🙂

[@carloalbertobirocco6264]

The upside-down red tube is awesome! What a trick to fix it firmly to the socket ...

[@DavidTipton101]

Hi Carlo, I wonder how many fell out over the years 😄

[@jeffreyhickman3871]

This is an example of an “Automotive Repair” radio 📻 I was talking about. The case is broken, and appears to be Bakelite. If I repaired it, I’d still see the damage. I like the dial cord system, which runs in front of the speaker 🔊. Seems a bit strange, but when the radio 📻 is assembled, you don’t see it. ‘50’s design, and tube type. This was the best thing of radios 📻 of the 1950’s and 1960’s. I keep forgetting to mention the 1920’s through the 1940’s. Fantastic radios were in production then, with the 1920’s, through 1940’s design. Once again, so were 🏠 houses. Radios and houses seemed synonymous with each other on design. The chassis of this radio is also a beauty. I wonder if the guy in Australia 🇦🇺 also makes you the tubes for your radios. That’s why I own modern junk as to say. I don’t know 🤷‍♀️ where to buy tubes. I have a cathedral style wooden radio from 1989. I don’t even know where to get a dial light bulb, and anything I try gets really hot, burns out, or blows out. I almost hacked a neon bulb from the power cord to the radio dial, which would work with no problem. The only concern was this may not be the safest route to go. I don’t want to burn my house down all for a dial bulb if I happen to do the job wrong. Maybe you know about dial bulbs, but there’s a great 👍 many styles and types of them. It’s the same size as a miniature Christmas 🎄 bulb, and is a clear incandescent ☝️ one, if that’s of any help.

[@DavidTipton101]

You will need to measure the voltage at the lamp to know which bulb to use. There are incandescent mini lamps available in various voltages

[@hijmestoffels5171]

I decided to watch some old David Tipton videos that I didn’t know yet. Nice, but I couldn’t help noticing that the quality of the sound and the editing have improved considerably over the years.

[@DavidTipton101]

Haha,,, yeah, I had a lot of trouble for the first few, fortunately I got better 😄

[@neilforbes416]

5:30 Those valves hanging upside down are "bat-valves! LOL😁

[@DavidTipton101]

🙂

[@sonofeloah]

The initial look at that poor radio, methinks the previous owner's team was losing and he decided to kick the radio in for a goal, right? And maybe he did kick it literally around the block a bit.

[@DavidTipton101]

You may be onto something there Azri'el 😄

[@tomcren59]

I have enjoyed every one of your videos and I am impressed with your craftsmanship. What kind of word did you do before you retired?

[@DavidTipton101]

Hi Tom, thanks for your comment. I was an aircraft engineer for 43 years ✈

[@catey62]

@@DavidTipton101 Well that explains something for me then. a common thread I've noticed in all your videos I've watched so far is your tendency to lean towards perfectionism and paying great attention to detail. in your job there would have been no compromise as far as that is concerned and it would have been paramount. love your work and how you bring these pieces of history back to life again.

[@DavidTipton101]

@@catey62 Aviation demands perfection but I think I was afflicted with it beforehand 🙄 as Monk would say, it's a blessing and a curse. Thank you for your kind words 🙂

[@catey62]

@@DavidTipton101 You're welcome :-)

[@عبدالرزاقالجلبي-ي3ص]

Good. Vary good Abdul razak

[@DavidTipton101]

Thanks Abdul 😀

[@neilforbes416]

9:19 The detail is incorrect as to the manufacturer as EMI was *not* trading as such in the 1950s. They were still trading as *Columbia Graphophone(Australia) Ltd.* as far as electrical product and records were concerned except for the London and Capitol labels which debuted the *EMI(Aust5ralia) Ltd.* branding around 1955 on those two labels only.

[@DavidTipton101]

The data is general regarding the company involved. It isn't broken down into time periods unless you follow the link and read the full story.

[@ladybug9070]

Great video. My son in law recently gave me a radio just like the one you are working on. Could you tell me please what the sliding button in the middle at the front is for?

[@DavidTipton101]

Hi Lady Bug, You have a good son 😉 the centre button is a tone control 👍🙂

[@ladybug9070]

@@DavidTipton101 Well as they say you learn something new everyday. Thankyou so much for your quick reply.

[@gerardomurillohernandez5807]

Caballero gracias por los saludos me gusta mucho su trabajo y me gusta la electrónica poseo unos radios antiguos como Hallicrafter en mal estado que espero revisarlos algún día aquí es difícil conseguir los diagramas pero de mi parte admiro su trabajo le envío un saludo y mis felicitaciones feliz noche gracias.

[@DavidTipton101]

Gracias Gerardo, buena suerte con tus proyectos. Debería poder obtener información en su radio Helicrafters, son muy populares 👍🙂

[@Martin-io4wc]

@ time 26:14, David that was very funny. You should do more of those. Lol, Martin.

[@DavidTipton101]

Hi Martin, thanks 🤦‍♂️😄

[@kennethgibbons2487]

I noted your slightly cynical comment on the previous case repairs:). Have never really taken to the bakalite(sp?) or plastic cases even though I know they were very much a part of the radio development. Unusual design the way the circuitry was split between the top and the bottom. What do you use for editing your video?

[@DavidTipton101]

Hi Kenneth, someone was probably quite proud of the original repair but it had served its purpose, luckily the adhesive cleaned off nicely making for an easy repair. The chassis layout was unusual, marketing must design the case and get the engineers to fit a radio into it or that's the way it looks. I use Pinnacle Studio for filming and editing.

[@SuperFredAZ]

With feedback: If the gain without feedback (A) is 40, and you use 5% negative feedback then the forward gain of the stage will be 8, however the distortion will be original distortion for example 5% divided by the open loop gain A, or approx. .125%

[@DavidTipton101]

Hi Fred, thank you for that 😀

[@andygozzo72]

EBF35? ! thats a strange one! never seen one here in the uk!

[@andygozzo72]

seems to have different pinout to the 'common' double diode pentode 6B8G/GT,

[@DavidTipton101]

It's a Phiips valve and was used in a number of Australian radios directly after the war. It was interchanged with other detector valves in the same chassis depending on supply. I assumed it came from Europe but you have me wondering now 🤔 Yes, the pinout is different.

[@andygozzo72]

@@DavidTipton101 i have a new zealand made 'ultimate' that uses a strange double diode pentode, also different pinout to the 6B8, cant remember the type number but was 6 something..

[@widecast]

A most unusual design. It uses a reflex IF stage which is also the 1st audio and also the detector stage. This is like a previous radio you repaired and might have been common in Australia in small radio designs. I don’t recall seeing such a design in a NZ set.

[@DavidTipton101]

Sorry, I replied to the wrong video comment page originally. Yes 4 valve reflex sets were fairly common in Oz. I'm a bit surprised not so common in NZ sets, I would have thought the two countries would have been more aligned. I must say I have trouble understanding the reflex design, mixing the audio with the RF and then passing it through the IF amp again seems it should just howl but it seems to work 🤔

[@widecast]

David Tipton NZ had quite a radio industry of it’s own and I’m sure they did their own thing. Some of the firms here were AWA, PYE, Akrad radio. Philips, DRECO, Collier and Beale etc. Collier and Beale made the ZC1 military HF transceiver during the war many of which became available as war surplus and were used in all sorts of applications and are still around today. We had all the major brands like HMV, COLUMBUS, to name just a few. Of course all these factories are long gone. A few continued on with TV manufacturing but they are all gone too.

[@ivanigorpollick6690]

i enjoy looking at your videos,and you do enjoy fixing them,,but what a wreck have you got this time

[@DavidTipton101]

Hi Ivan, thank you. Yes it's a bit of a mess 😄

[@زكيالحنين-و1ظ]

Professor, what kind of thread is used on the radio? Thank you

[@DavidTipton101]

Hi زكي الحنين, the dial string is a special cord so it won't stretch 👍

[@RajeshSharma-wy5jl]

Hi sir you have job I like this work

[@DavidTipton101]

Thank you Rajesh 😀

[@stephenwild2058]

It's probably of only minor importance since these amplifiers are not precision devices and any particular mismatch will probably only slightly reduce output power and increase distortion (but you are dealing with 10 or 12 % THD on one of these anyway), but your method of determining the turns ratio of a small, inexpensive output transformer by voltage difference using 50 cps power does not take into account the fact that your transformer is probably down at least 6 decibels (probably more) at that frequency... it would be better if you used a test frequency of around 400 cps instead to make the determination... but, as I said before, it's probably only being pedantic as far as practicality is concerned... There are some interesting variation on circuits in Australian radios; in North America by this time the standard was the five tube AC-DC receiver with only minor variations in design... they were pretty much the same even down to tube complements. Of course, operation on 240 volt mains practically ruled out series string sets, not to mention the fact that they were patently unsafe and thus probably would not have been allowed in many jurisdictions. I have an isolation transformer on my workbench which I use to test these things, and I add safety features to them in any case while working on them. I do enjoy your videos very much, by the way, especially as you go far beyond what I do in regard to chassis and cabinet restoration.

[@DavidTipton101]

The way I determined the turns ratio is what is used by all I have seen. As it's only a turns ratio test I wonder how much difference it would make at 400cps, I don't have the equipment to do it of course. There are a great variety of designs in our radios and even within the same company. I use an isolation transformer for all testing, I usually mention it. Thanks Stephen, I appreciate your comment 👍🙂

[@984francis]

It was hard not to try clicking on the page you had open😬

[@DavidTipton101]

Ha-ha... I know what you mean 🤦‍♂️🙂

[@SuperFredAZ]

I love to watch how meticulous you are. mind if I ask what you do with all these radios? Keep collecting, sell?

[@DavidTipton101]

Hi Fred, thank you. I keep them in my collection 👍🙂

[@petepeterson4540]

those were bat valves

[@DavidTipton101]

What were bat valves Pete?

[@petepeterson4540]

@@DavidTipton101 they hang upside down resembling bats american slang

[@DavidTipton101]

@@petepeterson4540 Ahh... got it 😄

[@mrlejones]

David, just some friendly advice.. always put a shield or cover over your speaker cone before soldering. Especially when soldering directly over it (like you did here). If the solder drips and hits the cone... your buying a new speaker.. Great video again though my friend!

[@DavidTipton101]

Noted, thanks Le 🙂👍

[@andygozzo72]

@@DavidTipton101 i've dropped solder on speaker cones before, you can usually pick it off .. carefully, ... if it does split the cone a bit, just paint over it with copydex, normally no need to replace the speaker just because of that ,

[@jonka1]

Good advice to care for the speaker cone but I think you're getting carried away by scrapping it. I've repaired many speaker cones and in 50 years have scrapped only a couple of speakers with blown coils.

[@andygozzo72]

@@jonka1 yep, speaker coil failure isnt common and a bit of solder stuck on the cone wont hurt it, even if you pull it off and leaves a little hole, patch it up with a rubbery glue..

[@erin19030]

I've always used single ply toilet paper and Duco cement placed over the tear , pressing gently the TP into the clear cement.

[@1974UTuber]

Looks like some kid used it to stand on and someone put it back together with liquid nails

[@DavidTipton101]

Haha... that's exactly what it looked like, no one will notice 😉😀

[@sheldonlatimer2531]

Why didn’t you just copy those scthes

[@DavidTipton101]

Sorry Sheldon, what are scthes?

[@mikejohansson6711]

Crikey! that ol girl looks like she was in London during the blitz!

[@DavidTipton101]

Stone the crows mike, you might be right, haha... yes it was pretty bad 😄

[@984francis]

Clearly this radio is in the wrong, or right hemisphere. Or it's a hemisphere friendly radio!

[@DavidTipton101]

Hi 984francis. It has a plate on it stating it's bi-hemisphere 😉😄

[@984francis]

@@DavidTipton101 😄

[@andreweh4]

Sorry, I normally enjoy your videos but the camera jumping around like that made me feel ill.

[@DavidTipton101]

Oh dear, sorry about that, that's a very early video. I hope I have improved since then

[@elc.eng.ihsanalmutari9298]

Thank you very much , can you translated the discussions to Arabic language I think that is difficult but we need to know everything of your jub THANK you again

[@DavidTipton101]

Hi Eng Elc, I don't know if that's possible but I'll check 👍🙂