For auld lang syne, ..high-end companies you really liked that are gone....

All the additional companies mentioned have merit and thank you for posting.

I am surprised that nobody had mentioned Montgomery Ward and their tube table top AM Clock Radios...  It is likely that some old timers on this site got their start that way.....including me. 
Yes from a Wards table radio to MG-20 etc. a long and worthwhile journey.  

ADS 
The speakers they made and that unique sound! I still drive a pair of ADS large full range L1590 towers. No need for a sub.  

B & K amplifiers and  B & K higher end pre-amps. I am using the Sonata series preamp and it reminds me sonically of my early PS Audio. Super simple, clean sound and fantastic MM phono section built in! The amp I use with this is the B & K Reference S200. I only wish I had money for two of them but love the sound of using just one. So much dynamic headroom and smooth detailed highs. 

Nakamichi
I am still using a 682 ZX with high grade Maxell tapes I record all kinds of tapes to enjoy. The best source is still recording from vinyl for me. I have owned so many cassette decks for the  past  40 years from Nakamichi. I am enjoying my rebuilt and upgraded CR3A Nakamichi with new caps, etc. I had a tech do it this year. The sound is amazing still. I guess I just love that unique sound from tape.

Dual
The early well built automatic tables were nice. I have a Dual 1249 now because I like the ease of use! I put a Prestige series Grado cartridge on it and it sings! It was rebuilt last year. 

Hafler
They did the best with mosfet sound to me. Very warm sound. The 110 Preamp was a favorite paired with a DH200. Will light up a pair of just about any speaker and sound great. 

Acoustat
My buddy still has his pair of large ribbon speakers from this Florida company. He drives them with VanAlsteen amp. Acoustat sounded as good as Magnepan if set up right with the proper amps.

AR speakers. So much invention and great sound for the money.

SAE (Scientific Audio Electronics).
I sold that brand when working at Pacific Stereo, here in California.  It was the coolest looking product in the industry, at the time. 
We also sold a ton of Phase Linear.  A lot of bang for the buck with Phase Linear.
The best sounding speakers we sold were AR, Advent, and Braun.  We brought in Mission speakers before I moved on from Pacific.  These are all brands no longer in business (I believe that Braun is in business, but no in hi-fi). 

@mammothguy - Sell any Allison speakers? Interesting designs...

Montgomery Ward's coolest line was "Airline".

DeKay