Thank you

there is not such a thing as too long video. Only viewers with patience too short.

No, there is no danger of that when the video runs at 10 X speed. Thumbs down for that.

100%

Make them a bit longer. 😊 Tbh I get totally engrossed. If you put these on at the cinema I'd go and see them.

Great idea 👍👍👍

Need to recap my Heathkit W5M mono amp, most difficult part will be opening the cans to put new capacitors in. They’re a main aesthetic of that amp.

Whoops, replied on wrong comment thread.

Lovely isn't it, and in such good condition as well 👌

@@Mymatevince I have a Beomaster 3000-2, and also an envelope with the schematics inside, probably B&O used to do this more often, caps need to be replaced.

I would love to see the other piece of paper that was in there - it looked like a letter? Probably something along the line of "Thank you for buying this"!?

Since when was IP a thing? Probably when one started copying from another. And that was the end of those marvelous schematics.

@@habana7638 many audio brands from this period did this it's not a b&o thing. Caps need to be replaced for longevity but you shouldn't expect a massive sound improvment upon replacement. It's more so a peace of mind thing then an audible improvement in most instances. If you have vintage speakers replacing the filter caps can make a massive difference though.

Yeah, there's a big peak at 100Hz too, and there's a whole bunch of additional harmonics clearly visible above 200Hz too. I suspect the reason the 100Hz peak is lower than the 200Hz harmonics is either because the speaker falls off at low frequencies, the app tries to approximate hearing sensitive or that the mic in the phone is less sensitive down low (might well be a combination). Other than the 100Hz being a bit low the sequence of harmonics peaks is exactly what should be expected.

Close, but no cigar it's all about the diodes and how each contribute a 50 Hz signal to the supply rail.

@@KorAllRBare No, he's exactly right. A full bridge rectifier doubles the input frequency of the input AC, IE 100Hz or 120Hz. Which is why there's a significant peak at 100Hz that MMV didn't notice because the 200Hz "first harmonic" peak was higher due to the equipent and/or speaker he used.

Well maybe you're right@@Torbjorn.Lindgren it's well over 48 Years since being schooled on rectification and the umpteen configurations utilising inductors, diodes and capacitors dealing with unwanted noise and possible harmonics, but I do remember how that 200Hz is to be expected, and I am pretty sure it's a lot to do with the timing in reference to each transformers secondary winding inductances and it's Va and at what point at any given moment each diode is conducting the inputted rising and or falling Voltage/Current comparative to all other secondary outputs that may or may not be in phase and thus adding to our supply rails design considerations.

Indeed, the mobile phone Mic is not setup to pickup lower frequencies in that range. So the harmonic is more prominent in the spectrum analyser. You would see the 100hz if you used the frequency range slider on your mini scope.

It's morse. Probably on the ham bands.

Look up mend it Mark if you like Audio repairs 😊

@@wisher21uk Mark must be the most cheerful technician on the planet!

@@adampoll4977 true even when he gets a kick off of the capacitors he has a laugh lol

They're probably leaky best to replace all the caps with modern ones for extra reliable performance ❤

Thank you

Also the bridge rectifier was working so that would double the frequency to start with. Speaking of the caps that one just above the corroded fuse looked a bit suspect - it could have leaked onto the fuse if it was stored in that orientation. I think I would look to replace all the caps at least in that area and you may find it sounds a lot better.

Beat me to it!

Thank you Fred👍

I think you're correct, other than the band... It's probably Morse the bottom end (1.81MHz - 1.838MHz) of the 160m band judging by the dial scale. This is a wideband broadcast AM/FM receiver and doesn't have the narrowband filter required for reception of individual CW stations... Interesting that the BFO managed to pick-out CW though. 73 DE 2E0PTY

I was gonna say it sounds like PSK-31 or something like that

I was thinking it sounded like a data mode of some description, but the suggestion that the receive is wide band does seem plausable of multiple CW transmissions.

Psk 31 or psk 62 teletype or telex thre are computer programs that can decode it

Pretty cool, thanks!

And you could plug in the external speaker plugs on two ways: one direction to switch off the internal loudspeaker and the other direction to keep it connected. Some brands offered an external speaker box with the same design as the build-in speaker. By adding only one box you could "widen" the stereo effect in the room.

No not teak or any kind of natural timber the case is made from laminate covered chipboard.

@@philcollins7701 Teak veneer, but real Teak. It is definitely not vinyl. I have several B&O from the period. It fits with the Danish design standard.

Ok maybe teak veneer but a chipboard core the restriction on imported teak was coming in about this time and the case would have been to costly made from solld teak.

Thank you Chris 👍😎

"I tell you what boy!" I remember :-)) I also remember our house having the Beomaster 1000, which was the same but with no speakers - a tuner-amp.

Yes i remember, i was working in a garage in the 80s listened to Steve Wright, Mr angry was my favourite character.

Take Note, Vince!!!!

Thank you Butter Ball 👌

Sound more sensible than a National railway company. Thank for finding that out.

Or you can get into the hobby on 2m for £30, or 10m for £150.

No not real wood, laminate covered chipboard just like the kitchen worksurfaces of the era.

Thank you Mick, great idea on the cap inside the cap. I wish I had done that. Next time 👍👍👍

Yes, but as an apprentice in radio electronics in the 70'ties, I did a lot of dial cords. If I made it wrong as Vince did (the dial moved to the left, when turning the wheel clockwise) the master of the workshop would cut the dial string and say "Wroooong - do it again"...

Having watched Mr Carlson I wonder what he would think of the lack of a variac power supply....

This is a bit modern for him.

Or the rather excellent “mend it mark”

"Mr. Carlson" is dreadfully overrated, pretentious, dry, and boring.

@@QuadMochaMatti then don't watch? If your career/speciality revolved around old radios and just radios in general, I'm sure you'd seem boring to most people too! :D

Thanks Jac 👍

I thought AC capacitors block DC current?

@@rogierius yes (more or less). The transformer changes the voltage, then diodes make sure the voltage is always positive, and then the filter capacitor is supposed to stabilize the voltage because when it comes straight from the diodes, there is still a lot of "swing" in it. When the filter capacitor isn't working, you hear it as hum. You could say the capacitor filters out the hum by shorting it to ground and doesn't let any DC current through to ground. My suggestion was to clamp a bench power supply onto the failed capacitor, so basically to inject DC into the circuit. The failed capacitor still doesn't short out the DC voltage (now from the bench supply) but because there's no hum to begin with, there's none to filter out either (which the capacitor couldn't do because it had failed). So the system would have been hum-free, proving that the hum was coming from the power supply and nowhere else. If there would have been another problem, for example hum coming from an input, the hum would still be there.

Thank you so much 😎

I'd like to say I understand this comment 😅🤣

Thank you. All the best to you and your family too👍

Then i shuld be dead, no need to worry

I thought it wasn't backlit even though I seen the lamps. However when I turned the lights off I could see the backlight then. If you skip to the end of the vid I show a little clip of it at night 👍👍👍Looks nice

It has...BUT I'm working on another B&O beauty right now, hopefully it will be released in a week.

@@Mymatevince More B&Os? Send in the B&Os.

if i remember correctly its from the 90s? a beocenter @@brutlern

When he showed it in the spectroid app you could see that there was also a 100hz hum!

I would be replacing every capacitor for sure, but for someone who doesn't listen to radio much it would be a waste of money and degrade the originality of the vintage piece. The better option might be to solder in a bluetooth module, because the amplifier stage sounded pretty clean with the line input.

😂 Hahaha, that one could knock out someone if it ever did ping

😂

I was thinking the same, lol. Sounds like the sound from Independence Day.