This is a 1962 Heathkit AA-100 stereo amplifier. This was purchased off Ebay for a project. Although the results are good, the most difficult part was wading through the pages of opinions on the internet. Pros and cons are in abundance. Replacing all the capacitors is a must and is not difficult. Replacing tubes depends on tube condition. Test them all. Mods? That's entirely up to you. I'm keeping this one original. One thing to consider.......If you plan on replacing the final output tubes, be aware that Russian tubes are somewhat taller than the originals and will prevent the cover from being re-installed. If cost is a factor, use the Russian tubes and run it without the top cover. It will run cooler anyway.
We won't debate tubes Vs solid state because it's all in the ear of the beholder. Personally, I like tubes. I grew up with them and that's the sound I think I like to hear, so that's that.
Although I hate to admit that one input is from a computer, the most important input is from a Gates CB-500, 16 inch turntable. Vinyl and tubes compliment each other quite well.
As long as the power transformer and output transformers are good this is a very restorable amp. Traces can be repaired. You can still buy the multi-section capacitors from Antique Electronic Supply.
This is a good mid range amplifier, although I do miss the instant on feature. Progress makes us impatient.