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Manufacturers Specifications

Have you popped the lid yet to see the inner workings?
No I was truly tempted to, but I shown a flashlight inside to look for critters or dust and it was like new. I have seen internal pics online and they are impressive.
 

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Power : 2x 200W (20Hz...20Khz ; 8 Ohm ; 0,003% THD)
Power bandwidth : 10Hz...100Khz (100W ; 8 Ohm ; 0,002% THD)
Frequency response : 0dB (10Hz ; DC mode, 8 Ohm)
0dB (1Khz ; DC mode, 8 Ohm)
DC...100Khz (+0 / -0,5dB ; 8 Ohm)
Damping factor : 200 (8 Ohm / 1Khz)
Input : 1,41V / 25kOhm
THD : 0,003% (20Hz...20Khz ; 8 Ohm ; 100W)
IMD : 0,003%
S/N ratio : 127dB
Stereo separation : 95dB (20Hz)
95dB (1Khz)
75dB (20Khz)
PC : 200W (US models ; 1% THD ; 1/10 output power)
1200W (EU models ; 1% THD)
Dimensions : 29 x 17,65 x 29cm
Weight : 9kg (US model)
9,2kg (U model)
Listprice : 190,000¥ (1980)

yamahab61.jpg
 
It's best that I don't post in this thread.

Suffice it to say, at last count there was over 650kg (1430lbs) of HiFi components not including speakers) in my loungeroom and work area alone. I was concerned about the weight as we have a timber floored pole home and I didn't want it all ending up on the forest floor...
 
Nakamichi PA-7A II

Rated 225wpc in to 8 ohms.

"Back in 1989, when Stereo Review featured the PA-7, writer Julian Hirsch measured the PA-7’s output at 253 watts into an 8-ohm load, 400 watts into a 4-ohm load, and 650 watts into two ohms."

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SWEEEET!!! Now that ROCKS!!! I had a few Nakamichi pieces in the past but nothing like that. That’s Awesome!
 
I wish youtube would up their bitrate from present 192 AAC to FLAC lossless. It sounds great now, but with so many new artist debuting on YouTube sound quality should be top priority. Bandwidth shouldn’t be an issue in 2018.
 
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I was Googling “class A receiver” and a link to eBay came up and it was listed as “fisher class A1 receiver 400 watts”. I said “Holy Hell !!”, well not really “Hell”. No watchers or bidders. Local pickup . I waited till last minute and bid and Won!!! I was the only bidder. Talk about lucky day!! Drove 150 miles to Ohio to pick it up. The gentleman was not an audiophile and was just unloading stuff he had in temperature controlled storage for over 10 years. I couldn’t sleep the night before the auction was over. I was constantly checking for bidders or watchers. In Heaven now. I think I have listened to it non-stop since buying it a few weeks ago. From what I have been researching, this may be 1 of only 3 working models in the United States.
 

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Cool I can play with my hot amps. The run at over 250 degrees near the red hot tubes, well the part that should be red hot. They are not red plating, btdt, moved on.

Less than 50 watts per channel (50 was spec but they are modified to use an available tube instead of one that is impossible to find.)

33.4 pounds, two required for stereo.

10-40k

0.3% THD 0.3% IM

16 Damping Factor.

These are excellent sounding amps. Our best listener in the group was just silent when he first heard them during an amp comparison and another in the group said "now that is what it is supposed to sound like"

They drive Dahlquist DQ-10s with ease. No need for 200 solid state watts when you have these hooked up.

What these specs show, especially compared to the first amp I posted is that the specs are not really going to be the indicator of sound quality that many think it is. Specs are fine for the initial evaluation, like vs. like but when two tube amps or two ss amps are compared listening is really the best form of evaluation
 
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I love vintage Yamaha. Those caps,power supply and heat sinks says it all!! Copper bracing too!! Quality!
I keep coming back to this picture of your amp. Mesmerizing & Beautiful solid copper and wood construction. I would be half tempted to construct a glass top just to show off inner workings.
 
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I keep coming back to this picture of your amp. Mesmerizing & Beautiful solid copper and wood construction. I would be half tempted to construct a glass top just to show off inner workings.

Copper coated chassis stuff is cool for sure. Not sure if it does anything but it does look nice.

A950_copper bottom.jpg
A950_top cover off.JPG Can't really see much on this one but all of the chassis stuff is copper coated and it's got little copper covers on the outputs transistors.
 
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