I feel it is time to upgrade my 1977 system.......

My girlfriend has an old Onkyo receiver and JBL floor-standing speakers from the 80s.  I got a WIIM mini network receiver with optical out into a small DAC that goes into the receiver with RCA cables.  I use a streaming app from my phone into the WIIM.  

It sounds really good.

Go ahead and splurge on a Luxman SQ-N150 Tube Integrated Amplifier.  $3300 and plenty of power for your Model 19s.  Looks cool and takes up very little space!
Spend some time auditioning speaker cables, power cables, and perhaps a dedicated circuit and power conditioner (if needed).  I would look at Shunyata.  And don't forget room conditioning!
I don't know what your table/arm/cart is, but you will have plenty of $ left over to upgrade if desired.

Note:  I ran my gray box Altec VOTT A-7s with a Dynamo ST-70 (modified and upgraded with a modified PAS 3x) for years and loved it!  Nice juicy tube sound!  The Luxman is much more accurate and less "tubey", but if I had your speakers I would certainly audition it.

As @carlsbad2 said, your Altecs are ungodly efficient.  You're probably never pulling more 10 watts and mostly never more than 3 or 4.    Those speakers were designed in the days of tube amps and are quite happy with them.  I think your best bet for tube amps would be those from VTA.  You can either enjoy the immense satisfaction of building them yourself from well made kits, or you can buy them fully assembled and tested.  

As efficient as your Altecs are, the ST-70 at 35 wpc will still be overkill.  I'd run them in triode mode at 20 wpc and you'll still have more than you need.

https://tubes4hifi.com/

I’ve purchased a great sounding system for $10k. All purchased used. So yeah, it can easily be done. And it definitely helps to have purchased my speakers locally without worrying about shipping costs and damage. 

If the OP has a preference for solid state, perhaps a First Watt might fill the bill and be dynamic enough for the Altecs. Even a 30.8 seems like overkill here. An XA25 is very often described as highly transparent. I am partial to the Pass products, with some Class A power, and their service is exemplary. I would buy used and update if necessary.

I don't have experience with Sugden, but I'd be happy to give one a listen.

worth a watch - sugden a21 vs pass int25

bear in mind he is quite a discriminating listener but is using his single driver high efficiency speaker with a small diameter driver, so one can imagine it does not make full use of the pass amp’s superior bass control/damping factor

https://youtu.be/0N85N6g3FXc

I would like to personally thank each and everyone of you for your thoughts and recomendations for a new system.  I think I will be leaning toward a tube preamp and still pondering about the amp.  I am trying to schedule a audition for McIntosh C8 and MC830 and Pass Lab has sparked my interest.

So many great ideas from you and even I am curious as to what direction I will go.....

Altecs here as well. Mac MC40 tube monoblocks rebuilt for power and a Audio Research SP8 for a preamp. It may all be old but boy does it sound great. New stuff never impresses me, I just shake my head at the stupid prices and smile everytime I turn my system on.

BillWojo

So in the last few months, I've demo'ed the following tube amps with my Model 19's:

• Coincident Frankenstein monoblocks (8 wpc)... very nice sound, but not enough power to generate adequate bass
• Consonance integrated with four 300B's (approx. 18 wpc)... not enough power and overall sound was too tame
• Chinese SET integrated with 845 tubes (23 wpc)... wonderful sound quality, but ground loop hum and noise from transformers were show stoppers.  I really wanted these to work as the sound quality was impressive.
• Quicksilver Mid Mono's (40 wpc)... bass was inadequate and dynamics were too tame
• Quicksilver KT Mono's with KT150 power tubes (100 wpc)... Finally, I've found amps with enough power to properly drive my 19's.  I never thought I'd need amps this powerful to drive speakers with such a high efficiency rating.  So far I'm about 75 hours into the break in process, but once they reached the 50 hour mark, I knew these amps were keepers.  Excellent dynamics, plenty of drive and very transparent.

I initially used a Music Reference RM9 MK2 (125 wpc) with the 19's and they sounded very good... but based upon the 19's high efficiency rating, I wanted to try some lower power tube amps.  Little did I know that the 19's high efficiency did not necessarily translate to being able to use low powered amps.  So... based upon my experience, my takeaway is that Model 19's need some power to get them to open up.   YMMV.

Hello, I owne the Model#19's for yeas and years Bought 2 pairs brand new for 1100 a Pair in Illinois.

Keep them. You will miss them, the compression driver those use stomp Jbl's ect.

You wull miss the sound as I do

Get a Rogue Tube amplifier and rolling some mullard input tubes.

Rogue are very reasonable and will control that woofer and give you sonic nirvana.

I own rogue and have went thru their line, Maybe run a Older Audible illusions preamp. you will hear things you never heard.

Get the rogue even the 88 will drive the hell out of those 19's.

Ive also ran Altec A-7 500    And A7X  1236 as well I ran a HK Citation 16. Sweet

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Regarding the tube preamp, check out Aric Audio. Aric makes several tube preamps. He can customize to your liking. 

I use mine with the Pass XA-25. A great combination.