way groovy cool!
You've gotten some good advice here. I've worked on several systems of this vintage and repair V-M changers for the local mid-century shoppe, so can offer a few suggestions.
1) The hot chassis-one side of the AC line is attached to the metal case also means the tonearm on the changer and probably the changer, too, can easily be at 120 V, referenced to ground. Until the caps are changed out, with proper attention to the isolation and across the line caps, be careful.
2) There's nothing wrong with those speakers - they're perfect for that amp. Nor is 1.5 watts RMS at 10%THD too quiet when it's all working properly. The 'flat' sound means the amp needs service - caps are dried out, the one across the tone control for each channel is probably causing this.
3) Have the service person add a fuse. One and one-half amp is plenty.
Nice as Micromatic turntables are, a properly restored V-M with a new cartridge and stylus is NOT going to hurt your records. One can easily get carried away about these things. There's tons of info on what to do to restore one out there, any service manual with a picture of that little rubber sensor between the platter and the tonearm will have all the info you need. I've got one for the 1200 series which had everything I needed for one of the very last with 1661s. Your changer probably is a 1201 or thereabouts. If it's beyond your abilities, any 120x or 130x series will 'drop in'. If you need help getting it out, just ask. It's easy once you know how. Do not, under any circumstances, damage the pot metal jack into which the power cord plugs in. They were brittle 55 years ago....
This is a beautiful looking stereo, I'm glad you found it and, once you get a few things done, you'll be (pleasantly) shocked how good it sounds.
The link is to the V-M site. There, you can get any part you need or even an entire changer, completely rebuilt.
Voice Of Music, V-M Audio Enthusiasts
www.thevoiceofmusic.com