Sansui Alpha AU-907MR (Excessive Distortion and Control Cleaning)
2024 ж. 10 Мам.
8 848 Рет қаралды
In this video we investigate the 907MR which is creating excessive distortion on the audio analyzer
In this video we investigate the 907MR which is creating excessive distortion on the audio analyzer
That's dedication man, well done!
Thanks! 😉
That's a way to go for cleaning the switches! No contact cleaners, deoxid or other crappy sprays. You have to open them and clean the contacts properly, just as shown on the video, Best Regards!
I always have aquire extra courage, before tackling this part of a amplifier restoration. Thanks for showing this tedious proces! One question though, why not using a small desoldering gun when removing the switches? This makes the job somewhat easier and faster. Cheers from the Netherlands,
It’s on my list believe me, you get so used to things over the years that you just keep doing it. Im planning on upgrading my soldering station with the desoldering gun addon, just haven’t worked up the courage to spend the $650AUD on it 🤣 I know there are cheaper ones but ive been spoiled by induction soldering irons that I can never go back
@@whatcouldgowrong7914 Aha, i understand. If 'm beeing honest, i have been doing it for many years like you in the past. At the shop where i worked, they had a Hakko 807 or 808. So i got spoiled. Can't remember exactly the modelnumber. This was mid 90's. When i started my small repairshop a couple of years later, a Hakko was on my shortlist, plus the famous Fluke 87 series. At one point both items where somewhat affordable on sale at my local distributor, and i didn't hesitate. I understand your wish to buy a decent one. Then you only buy once. Both the Fluke, and my Hakko 470 are still used to this day. But the Hakko did need some fair bit of attention in the past 20 years twice. Parts are getting harder to find for a older station now. Just stumbled accross your channel today, nice to see a collegue who works like i do. Thorough, and the way you should be doing things. There are some good repairchannels on yt, and always nice to find a new good one to follow. Cheers, Nico.
Many thanks for joining the channel 🙏
I gotta ask, did you end up cleaning the mm/mc switch? Very courageous and patient work!
Yes I did, while I was in there, was the same as the front switches :)
@@whatcouldgowrong7914 Great, that satisfies my OCD tendencies.....
My OCD was satisfied also :)
That's a beautiful piece of equipment despite its faults - such a shame we never saw them in the UK (by the mid '90s Sansui had repositioned themselves as a bargain basement player, sold by Richer Sounds and mostly rebadged Chinese and Korean stuff).
Unfortunately the Alpha amplifiers were only ever Japanese domestic I think so the entire world missed out on them… Japan kept all the good stuff for themselves
All these switch have never been designed to be open just to be replaced
Not replaceable anymore unfortunately 😞 unobtainable
@@whatcouldgowrong7914 I know
That doesnt mean it can not be opened and cleaned, i personally disassembly everything, sometimes its time consumming but its only one way to keep them working
Matsushita, the best.
Back in the day.... Age takes its toll on everything unfortunately...
I would expect gold-plated contacts in a flagship.
The relay contacts were gold plated, the switchgear is all ALPS, the ALPS volume pot is the biggest I have seen in any amplifier which was the best of the best back in the day 🙏
@@whatcouldgowrong7914 I reffer 6:36
@@helmut3356 The fingers are gold plated but the plates aren’t, I’m sure they have their reasons as ALPS didn’t cut corners.