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This was one of those "auction ending soon with zero bids" sort of situations. It could do with a bit of a plastic bezel polish. However, if my video were not a potato, you'd be a little jelly about how cosmetically clean this thing is.
The M-45 was the baby in their 1986 product lineup. This is what Yamaha's bottom tier looked like back then:
Minimum RMS Output Power Per Channel
20 Hz to 20 kHz 0.003% THD, 8 ohms........125 watts
0.007% THD, 6 ohms........150 watts
0.002% THD, 4 ohms........180 watts
Auto Class A Operation Range (8 ohms)........ 10 watts
Dynamic Power per channel (IHF) 1 khz:
8 ohms/6 ohms/4 ohms/2 ohms 170W/210W/285W/390W
Look at that dynamic headroom! 2dB! I'm in love.
It will be getting a full re-cap, and possibly new speaker relays while I'm in there. Not coincidentally, I have in my possession an M-80, the previous year's flagship. It happens to be non-functional. It was given to me by someone with two other M series in need of service. If I can get the M-80 repaired and his other two restored, the M-80 is mine. Game on, I guess.
I love those old Yamaha amps. Had a M-40 for some years, sold it to a brother in the DIY community.
Nice! Nothing like dancing LEDs or VU meters to hype up the music!🤘🏼
My speakers are too sensitive. I'm not going to get to see a whole lot of those LEDs. First world problems I guess? Haha!
Might be an adjustment/modification in there to get more action if you're not to attached to accuracy.
There definitely is a trim pot inside. Or maybe I just give myself permission to try something in that 83dB range...
Funny story. When I first hooked it up, I fired up whatever disc was in the player. Slowly started increasing the volume, and there was just an alarming amount of hiss through the speakers, and I was getting no music. I started to wonder if the M-45 was a dud.
I had the InDIYana test disc still in the player. The first track is pink noise.
That's a sweet amp, Dirk! I'm not in love with the midline CR series receivers so much, but I think their separates are in another tier. That M-80 is a total brute! It ought to get the job done and sound great regardless of what it's driving. Are you on Audiokarma?
That's the M-4 you sold me! I'm just finishing up some repairs and replacement of over 80 caps on a matching C4 preamp that will be paired with it. That C4 is a pain to keep running, but it's sure worth it! The M-4 is probably next up on the bench.
To quote Norm McDonald, "Germans love David Hasselhoff."
YammyHammy knew what they were doing back then.
Glad you are paying attention to it! I never got around to working on it.
..and a meme was born. Long live derpcat!