I have an Electrohome model 20E401 TV that has very little volume. Some of the channels I can hardly hear with the volume @ 100 (as hight as it will go). Is this fixable without having to go to the expense of getting an amp and speakers?

That depends on whether the problem is an internal malfunction of the TV or not.
I had this problem once, and as it turned out, it was the volume on my "cable box"
That was turned all the way down. I had no volume at all even though I had
The TV volume turned all the way up. The cable repairman had done this
When he was installing a new cable box, and didn't mention it at the time.

If you have a cable box or satellite TV, be sure that the volume on the
Cable or satellite control is turned up at least to the mid-point. If
They're turned all the way down, the TV volume is of absolutely no use
While its hooked up to them. Hope it's this simple for you, and not
Something that needs to be fixed by a technician.