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Cross-posted from the: This stunning piece of late mid-century modern German engineering, the iconic Grundig SO 191, recently came through the shop. It’s owner picked it up from an antique shop in nearly pristine cosmetic condition, but with a few electrical issues to sort out. It’d power on, but wouldn’t play!

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Results 1 - 48 of 169 - I am not familiar with antique radios or old electronics but feel free to send. THIS GRUNDIG STEREO IS BEING SOLD WITH BUY-IT-NOW.

That’s definitely a problem, and so it was time for a full overhaul. Other than a stain at the bottom of the grille cloth, this console was immaculate. It’s a massive, powerful, top-of-the-line console from the era: a total of 16 tubes, AM/FM/Shortwave and a powerful stereo amplifier with push-pull EL95s per channel driving three high-efficiency drivers, two forward-firing and one side-firing per channel for a total of six speakers. It’s so powerful, it’s split up onto two chassis! The amplifier module itself is well regarded in audiophile circles and can command several hundred dollars on the secondary market. It’s paired with the tuner unit with a magic eye tuning indicator and the rest of the circuitry. The technology also really shows the era this was made in: while it has a very sensitive and high fidelity FM tuner, and the amplifier itself is stereo, there’s only true stereo output possible from a turntable or reel-to-reel: the FM tuner lacks an onboard de-multiplexer and has no provisions for an external one.

When this console was manufactured, FM Stereo had only just barely been invented and wasn’t fully standardized yet. It’s unfortunate, but even still, it sounds great in dual-mono when fixed up! Underneath, six coupling capacitors had been replaced with new film caps sometime in the ’90s, but the rest was all original. And the cause of the lack of output was very apparent: one lead of a power resistor in the B+ path was broken off, depriving most of the tubes of their power. That’s no good! A full re-cap of the amplifier, including Nichicon electrolytic capacitors in the signal path and KXG-series electrolytic capacitors in the power supply for extra long life.

I tested the forward and reverse resistance of the selenium rectifiers and they were within spec, so I left them in place. There’s a very large selenium bridge in a can on top of the chassis, and a single-plate selenium rectifier for the bias supply. Up in the tuner section, it’s cramped as German radios often are – but with the amplifier and power supply on a separate chassis, it was surprisingly workable! I spot-checked resistors for tolerance as I passed them and every one I measured was within specification, as has been the case on nearly every German radio I’ve serviced.

They sure built them to last! After component replacement, it was time for a first power-up. Not bad – but not great, either. There were a few issues.

First was the power switch: the switch mechanism itself was damaged, somehow, and would never energize. Cleaning didn’t help and the switch was buried deep in the mechanism so the owner opted to bypass it and install a new switch on the power cord. Finally, the multiband tone control had an issue. Most of the bands worked, but the final treble adjustment which worked by pushing on a cable via mechanical linkage to change the bandwidth of the final IF transformer was nonfunctional.

The cable was seized inside its housing, and cleaning and lubrication from both ends weren’t sufficient to fix it. The risk of permanent, functionality-killing damage was too great to overcome so we decided to leave that as-is. “Normal” through “Decreased” worked, but a treble increase wasn’t available after this fix. Then, an alignment, and ready to go home! This radio is truly a marvel of high-end German engineering and with this service, it wouldn’t surprise me to have it last another 50 years.

It’s a lot of work (and a fair bit of money!) to bring one of these back to life but it’s well worth it in the warm yet commanding sound they produce. If you need your vintage radio serviced,! Jwk, reading your comments it looks like you repair radios regularly so I had asked where you were located but no response. Maybe you can just answer me a couple quick questions please as I have the same exact unit. I reread your article and on your unit you said somebody had replaced the six coupling capacitors. Did you go ahead and replace those with the originals? As far as the rest of the rebuild you just recapped the rest of the chassis, checked the rectifiers and resistors for specs and that was about it?

I’m thinking of tackling mine on my own cuz I can’t find anybody and I would really love to get this working again as it was my father’s. Where do you suggest buying the parts and do you know part numbers by chance?

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I have fixed minor things and have replaced bridge rectifiers and caps in the past and have ordered parts from Mouser, Digi key Etc I really appreciate it. I would love to get this running in honor of my father. He was so proud of this thing. I also have a bunch of reel-to-reels that I know my family recorded on probably before I was born. I know he had the microphone and I remember hearing stories about them recording reel-to-reels. I would love to hear them. I would assume the reel-to-reel and turntable are a whole nother animal.

If I recall, their belt driven. Have you ever dug into either on this model and if somebody’s fairly mechanically inclined how are they? Primarily belt cleaning and lube?

Hey jwk, I’ve got this exact unit (the -US model) and looking to get it recapped or recap it myself. We powered it up when we got it home and I believe everything worked and it sure sounded great but it’s got all the original paper caps. Any idea where can I get a schematic that’s in English?

Also, how best to get it recapped? I’m confident in my soldering skills, but not in my “this 1962 German capacitor needs to be replaced with this 2017 one” diagnosing ability. Any idea what it would cost to have the amp and the tuner recapped by a pro?

The FM antenna also has some damage and I don’t believe it to be repairable but I’m ok with replacing it or upgrading it. I’m in central Vermont, and would love any input or guidance you have. Excited to get this thing back up and running and in the living room for the missus. Jwk, reading your comments it looks like you repair radios regularly so I had asked where you were located but no response. Maybe you can just answer me a couple quick questions please as I have the same exact unit.

I reread your article and on your unit you said somebody had replaced the six coupling capacitors. Did you go ahead and replace those with the originals? As far as the rest of the rebuild you just recapped the rest of the chassis, checked the rectifiers and resistors for specs and that was about it?

I’m thinking of tackling mine on my own cuz I can’t find anybody and I would really love to get this working again as it was my father’s. Where do you suggest buying the parts and do you know part numbers by chance? I have fixed minor things and have replaced bridge rectifiers and caps in the past and have ordered parts from Mouser, Digi key Etc I really appreciate it.

I would love to get this running in honor of my father. He was so proud of this thing. I also have a bunch of reel-to-reels that I know my family recorded on probably before I was born. I know he had the microphone and I remember hearing stories about them recording reel-to-reels. I would love to hear them. I would assume the reel-to-reel and turntable are a whole nother animal. If I recall, their belt driven.

Have you ever dug into either on this model and if somebody’s fairly mechanically inclined how are they? Primarily belt cleaning and lube?

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