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 Post subject: Blaupunkt Riviera 94800 restoration
PostPosted: Aug Thu 26, 2021 8:58 pm 
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Having seen enough on YouTube how the guys are restoring the radio, I could not resist and also decided that just buying a new radio is not interesting, and reviving a dead radio with your own hands is a completely different matter!

Not so long ago I revived a favorite radio of my childhood Riga-104 https://www.youtube.com/watch?v=ydU0Y6038n0 and decided to find something from the German classics.

Today I received a recently purchased (marked as non worked) radio Blaupunkt Riviera 94800 from a flea market for restoration. Terribly dirty (but almost laundered), missed some parts and someone was digging it with crooked hands. Today I replaced part of the capacitors and restored part of the power supply wiring according to the scheme, and it started working on VHF. Silence on other bands. It is a pity that the original speaker is open. I will try to fix it too.

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 Post subject: Re: Blaupunkt Riviera 94800 restoration
PostPosted: Aug Thu 26, 2021 9:08 pm 
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The first surprise awaited immediately in the process of cleaning the board. I washed it with a mixture of isopropyl alcohol and gasoline, which usually leaves no residue. But in this case, after drying, a green plaque appeared on the board, which can only be cleaned mechanically.

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Very nice speaker with a break in the coil. I need to try to restore it. So far I have connected another one for testing.

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Someone apparently tried to repair without a diagram. There are many wrong wires, one capacitor of a different nominal and soldered with wrong polarity. However, I also barely found a scheme for it, which I download 3 sheets a day (

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Rare model - not information on web (

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 Post subject: Re: Blaupunkt Riviera 94800 restoration
PostPosted: Aug Thu 26, 2021 9:19 pm 
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I also discovered a strange capacitor. I can't understand whether it burned out itself or someone carelessly burned it with a soldering iron? I think it would be right to change it. Maybe with this one? Metallized Polypropylene Film Capacitor http://www.klsele.com/products/Capacitors/Film-Capacitors-Series/1657.html

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 Post subject: Re: Blaupunkt Riviera 94800 restoration
PostPosted: Aug Fri 27, 2021 11:08 pm 
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I killed half a day to restore the speaker wires according to the diagram. The inaccuracy in the diagram was confusing. Instead of 99, it was written 93.

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Extremely unfriendly design and difficult waveband switch board access. Found a fallen off emitter of the V910 transistor. With great difficulty I evaporated it, extended the legs with a wire and soldered back.

Then there are two big problems - the AM reception completely disappears and appears. I checked "Oscill. voltage" and it looks like no generation on MW, LW and KW on V910. On UKW signal good and clear on V881...

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The cores of the coils do not rotate. I don't even know what to do.

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 Post subject: Re: Blaupunkt Riviera 94800 restoration
PostPosted: Aug Sat 28, 2021 1:04 am 
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Привіт... :)

The plastic formers shrink and a lot of people bust / (break) the ferrite slugs.

Never use a metal screwdriver. Make you own alignment tools by filing down some plastic chopsticks or plastic knitting needles ←(both hard engineering plastic), or buy a set.

With ferrite tuning slugs...
In the beginning... If they don't move freely with a small amount of force... STOP
apply a few drops of alcohol/Zippo lighter fuel and jet some heat into the hole with a hot hair dryer or touch them a few times with a relatively hot soldering iron, or heat a finishing nail (held with pliers) and touch the slug.

ласкаво просимо на форум
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 Post subject: Re: Blaupunkt Riviera 94800 restoration
PostPosted: Aug Sat 28, 2021 7:46 am 
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Thanks, Greg.

I'm afraid I've already broke them. But they didn't seem to budge.

In Soviet radios, ferrite slugs usually had plastic caps with a screwdriver notch. I'm an idiot. The experiences of impotence come over the years.

It is better, of course, to unsolder the coil for manipulation, but I'm afraid to disassemble this unit. Very difficult. I will clean the contacts with a spray. However, today I will go to the market and look for donor coils.

P.S. I find another mistake in draw - it is C927, not C924

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 Post subject: Re: Blaupunkt Riviera 94800 restoration
PostPosted: Aug Sat 28, 2021 8:59 pm 
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US7IGN wrote:
I also discovered a strange capacitor.


I understood why this capacitor burned out. Next to it is a 1 Ohm R742 1/2 W resistor, which apparently burned out and burned the adjacent elements. Someone replaced it with 2W 0.47 Ohm. I installed the correct one and replaced the capacitor.

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Also I found the reason why there was a bad reception on AM. Everything began to work fine after replacing electrolytic capacitor in the circuit of the transistor V706 that amplifies the AVC voltage.

Conclusion - you need to replace all electrolytic capacitors at once, without exception.

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 Post subject: Re: Blaupunkt Riviera 94800 restoration
PostPosted: Aug Sat 28, 2021 9:13 pm 
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Today I went to the local radio market, bought capacitors and other useful things. Including I found coils with cores and cores separately for replacement. But it turned out that I only broke part of one in L954. But on the other side of core there was also a slot and I just turned it over.

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 Post subject: Re: Blaupunkt Riviera 94800 restoration
PostPosted: Aug Sat 28, 2021 9:30 pm 
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Regarding the adjustment. My wife began to swear that she had a headache from the squeak of 1 kHz and I decided to make a load with switching from an improvised material.

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After adjusting the radio, you cannot recognize it - a very sensitive receiver. It's a pity I have a lot of interference and noise in apartment and I need to get out of town with it.

And I just didn't understand what ratio voltage is and how to properly regulate p.9. And where should those 1.4 volts be?

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I connected a voltmeter to <8> and by adjusting the coil L769 and resistor R766 I got zero on the voltmeter.

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 Post subject: Re: Blaupunkt Riviera 94800 restoration
PostPosted: Aug Mon 30, 2021 7:52 am 
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So, the hardest part for me. The radio enclosure lost some decorative elements, including the carrying handle (
One such plastic strip is simply missing. I am thinking of picking up a similar aluminum one.

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I have seen on the internet people changing the carrying handles to the belt. I’ll think about it. Alternatively, it can also be made from an aluminum strip. One bolt for its fastening is also lost. It's good that there is only one left and I can order a new one from a turner according to the sample.

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 Post subject: Re: Blaupunkt Riviera 94800 restoration
PostPosted: Aug Mon 30, 2021 8:06 am 
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Welcome to the board, and you have done an excellent job in restoring what appeared to be a "basket case" set, congrats!

Please continue posting on your cosmetic restoration.

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 Post subject: Re: Blaupunkt Riviera 94800 restoration
PostPosted: Aug Mon 30, 2021 8:45 am 
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fifties wrote:
what appeared to be a "basket case" set


Thanks!

You should have seen the grimace on my wife's face when I brought this dirty and awful stinking bundle)

But I will continue about the problems that need to be solved. Antenna. I decided to install the new antenna on the original mount. But I squeezed it ugly and it dangles. Alternatively, to solder it, but I need to think about how they are squeezed it at the factory and do the same.

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Also, someone previously installed an external power connector instead of a connector for an external antenna. It's nice to have both. What would you do? 1. leave the connector of external power supply (I can add a 7809 stabilizer so that it does not depend on the input voltage) or 2. return the external antenna socket.

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Of course, I will put such a box for the batteries inside, just figure out how to attach it to the case and easily get it out.

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 Post subject: Re: Blaupunkt Riviera 94800 restoration
PostPosted: Aug Mon 30, 2021 6:58 pm 
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One more thing I cannot understand (

The Germans decided to save on a separate coil and combined L954 (M) and L955 (L) on one tube with one core adjustment. As a result, with an ideal tuning of medium waves, the entire scale at long waves is shifted by 50 kHz upward in frequency. The C917 capacitor has practically no effect on the adjusting. The values of the capacitors C913 and C920 are practically normal. I had an idea to move the L955 coil on the tube, but it is securely glued (

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 Post subject: Re: Blaupunkt Riviera 94800 restoration
PostPosted: Aug Mon 30, 2021 8:47 pm 
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US7IGN wrote:

Antenna. I decided to install the new antenna on the original mount. But I squeezed it ugly and it dangles. Alternatively, to solder it, but I need to think about how they are squeezed it at the factory and do the same.

What part of the whip antenna did you deform by squeezing? Each section has a turned in lip, which keeps a copper shim against the next section inside of it from coming out. That copper piece is what keeps each section stable.


US7IGN wrote:
Also, someone previously installed an external power connector instead of a connector for an external antenna. It's nice to have both. What would you do? 1. leave the connector of external power supply (I can add a 7809 stabilizer so that it does not depend on the input voltage) or 2. return the external antenna socket.

This would be a matter of personal choice. Since you said that "it's nice to have both", I would suggest leaving it, as is.

BTW, what country are you located in? The reason I ask is that;
US7IGN wrote:

The Germans decided to save on a separate coil and combined L954 (M) and L955 (L) on one tube with one core adjustment. As a result, with an ideal tuning of medium waves, the entire scale at long waves is shifted by 50 kHz upward in frequency.

Here in the states, the long wave frequencies are pretty much dead. If that's basically the case in your area, I would definitely just leave it alone, as I assume the MW is much more important for the dial to be accurate.

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 Post subject: Re: Blaupunkt Riviera 94800 restoration
PostPosted: Aug Mon 30, 2021 9:15 pm 
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fifties wrote:
What part of the whip antenna did you deform by squeezing?


Since I bought new telescopes, I removed old broken telescope (retractable parts) from the old base. The new telescopes had threaded plugs at the bottom. I sawed off bottom of lower knee with these plugs and left only the thin tubes (retractable parts) that I want to sit on the old base. The new telescope sat down a bit loose and I tried to squeeze it with wire cutters. The result can be seen in the photo.

fifties wrote:
BTW, what country are you located in? The reason I ask is that;

Here in the states, the long wave frequencies are pretty much dead. If that's basically the case in your area, I would definitely just leave it alone, as I assume the MW is much more important for the dial to be accurate.


Sorry, I updated my profile information - I'm from Ukraine. But on the magnetic antenna of any receiver at long waves here, only a couple of stations and a few air beacons are heard.

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 Post subject: Re: Blaupunkt Riviera 94800 restoration
PostPosted: Aug Mon 30, 2021 11:16 pm 
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So if I understand correctly, you crimped the bottom of the lowest telescoping section around the top of the "knee", as you call the upper rotatable section of the original base.

I would remove it, and working the inside with a proper tool, or both sides with needle nose pliers, try to get it back as close as possible to it's original round shape. Alternatively, you could hacksaw or Dremel off the deformed area.

I would then find a very thin piece of sheet metal, cut it to size, and wrap it around the top of the "knee". You may only need a half or even a quarter wrap.

Lastly force the bottom of the lower antenna section over it, for a snug fit.

I don't know if chromed metal can be soldered.

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 Post subject: Re: Blaupunkt Riviera 94800 restoration
PostPosted: Aug Tue 31, 2021 7:25 am 
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fifties wrote:
I would then find a very thin piece of sheet metal, cut it to size, and wrap it around the top of the "knee". You may only need a half or even a quarter wrap.
I don't know if chromed metal can be soldered.


Good advice with a gasket. chromed metal can't be soldered, but from the inside of the tube, I was able to tin the brass, so after thickening the layer of solder and heating the tube, I will try to fit it tightly onto the base.

And nevertheless, I'm in search of a solution to how these pipes are crimped at the factory ...

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 Post subject: Re: Blaupunkt Riviera 94800 restoration
PostPosted: Aug Tue 31, 2021 5:05 pm 
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The right antenna has been successfully replaced (some solder for density and a neat crimp with wire cutters) and a new molding strip is glued on top. It is chrome, and the initial ones are a little yellow (like gold), but the "blaupunkt" label on front is also chrome, so you can see the difference if you know where to look. I decided not to rip off all the other whole edges and leave it that way. It remains to solve the issue of the handle ...

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 Post subject: Re: Blaupunkt Riviera 94800 restoration
PostPosted: Sep Fri 03, 2021 3:09 pm 
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The final touch on the antenna. One of the antennas in the folded state was in a shielded case. Over time, the foil or coating disappeared and only the clamp remained. I covered the tube with cling foil.

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 Post subject: Re: Blaupunkt Riviera 94800 restoration
PostPosted: Sep Mon 06, 2021 6:28 pm 
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US7IGN wrote:
So, the hardest part for me. The radio enclosure lost some decorative elements, including the carrying handle (
One such plastic strip is simply missing. I am thinking of picking up a similar aluminum one.

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The attachment IMG_20210830_090231.jpg is no longer available


Found a 2mm thin anodized aluminum strip at a local hardware store. Original plastic is 1mm thin.

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