Eu o possuo a mais de 8 anos e nunca deu o menor problema. Quando ao som, nao eh necessario dizer que foi o melhor ja ouvido em minha sala. Já tinha testado em meu sistema diversos amps (Audio-Research, Yamaha, Adcom etc...) mas nenhum me satisfez plenamente seja pelo alto preco, manutencao complicada, auto consumo, ou pecas dificeis de se encontrar no caso de algum problema. Posso dizer que o MC-30 se compara a um FUSCA pela simplicidade, robustez e manutencao facil porem, o som que se ouve eh maravilhoso.
No momento estao "tocando" um par de Energy C-22 em uma sala de 26 m2 e estou ate pensando em adquirir um outro par para montar um sistema H.Cinema.
Caso saiba de algum para venda...

Built like tanks, mine are approaching 40 years old and sound as good as the day they were built. I'm sure I'll get another 40 more years from them. They are EXTREMELY musical. They really bring your music to life. If you can find them buy two since they are mono. Crank those babies up and compare it to a new amp for the same price and see why in the late 50's and early 60's people were willing to spend the equivilant of months and months earnings for these true classics. And they look nice.

They are a little heavy to move.

I've been playing mine hard for 10 years on top of the 30 + years they had on them when I bought them...all with out a hitch. Very easy to listen to. I would very highly recommend them.

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All Mcintosh tube gear I can afford.