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I have no idea on how to read a schematic which one is better ?

I have a D1200 in mint condition, got it for less than $100, how close is the design of the D1200 to the Nad 2200 ?

Here are the schematics

I got lucky and was able to get this Superphon DM 200 for $125, there not much information out there about the amp Designer was Stan Warren former PS audio The amp sounds amazing, and is working fine, it came out in 1988 Transistors are 2SD424 NPN/ 2SB554 Toshiba 40000MD for storage, wow rated...

Does anyone agree with this review about the Kenwood amp ?

Would it be possible to convert the MK1 to a MK2 ? I know the MK2 has different output transistors If you have to choose between The 05 vs 07 mk1 ? Also to take advantage of the MK2 and 05 amps, do I need a preamp with the same frequency response ?

So in the end, the MK1 version will last longer and wont oscillate

Are the MK2 version of the amp, much better than the originals ? The only difference in the spec is the frequency response Frequency response: 1Hz to 50kHz MK1 Frequency response: 1Hz to 600kHz MK2 Should I be worry about the Frequency response ?

I just got a Soundcraftsmen MTX S860 amp, I did some research and someone tested the amp Here are some numbers at 1204 180 watts what do you guys think ?

I was able to get a rotel rb-991 for $100, but 1 channel is out, the amp is with my tech right now https://www.hifiengine.com/manual_library/rotel/rb-991.shtml Can anyone comment on the design of the RB-991 and if it is better than the 1070 ? Full review with numbers...

I did some research on the P-2200, and that particular Yamaha amp is the base for the M-2. Here is the professional review of the M-2 https://www.hifinews.com/content/yamaha-c-2am-2-prepower-amplifier can someone review the lab report and check if the numbers are good ?

Maybe in the future, @restorer-john what do you make of the P-2200 ?

The hum is coming from the speakers

Maybe is the wrong topic, but I got a Yamaha P-2200 mint condition for $70. Working fine so far, a bit of hum when I set the input attenuators to 0db, is that normal ? Can the P-2200 be used as home audio amp ? Some pics of the inside Here are the charts for the specs

Some pics of the amp

what are the output transistor ?

Here https://www.audioservicemanuals.com/k/kenwood/kenwood-mx/160240-kenwood-mx-5000-service-manual

I was too late, the guy sold the pair for $100, but he sold me a nice Yamaha cx-2 preamp for $100, not bad at all. I was able to get a Kenwood MX-5000 for $60, not much info, it was the last stereo amp from Kenwood. Any comment on the design and topology ? waiting to arrive...

Are they specs any good ?

I was offered a pair of MA700 Mono Amplifiers, I know they were designed for 5.1, thinking about using for a stereo set up. There is not much info out there Here are the specs