When were the best tube amps made?

In 1956 @ 328 Chauncey St. Brooklyn NY

Yesterday

Every time has good, bad, mediocre.

@erik_squires Funny you mentioned AR from 80's. AR fans will hate me for this, but AR SP9 MkIII  has remained one the WORST sounding components I ever purchased, very bad memories of that one. Hybrid design didn't work for me, SP10 would have been much better choice. This purchase probably around 1984-5.

AR fans will hate me for this, but AR SP9 MkIII  has remained one the WORST sounding components I ever purchased, very bad memories of that one. Hybrid design didn't work for me, SP10 would have been much better choice. This purchase probably around 1984-5.

@sns 

Yeah - have to agree. Some years ago, a few friends and I did a shootout of several preamps. There was an older AR hybrid preamp in the mix, and I believe it was specifically the SP9. Tons of gain. It performed relatively poorly. Couldn't even keep up with the entry level Rogue Metis, much less their 99, and an Athena just blew it all away. It was more on par with the Sonic Frontiers SFL-1, also a hybrid. Those hybrid preamps had a steely edge and sounded lean and unnatural compared to the all-tube preamps. 

But that SP9 has seemingly NOTHING in common with the current Audio Research preamps, which are absolutely wonderful. Still a big fan of the Reference 6 here. AR really upped its game in the current era.

I wonder how much of my opinion of ARC has come from the SP9 and so many who claimed to love it at the time?

I agree that the current ARC line is much better than what I remember from the mid 1980's. 

Weird to me you'd attempt a hybrid preamp.