Cosmonaut Volkov Tomatoes :)

[Chessnut23]

I just wanted to share this with fellow tomato lovers.
For 4 or 5 years now I have grown a little known tomato variety called Cosmonaut Volkov.
They always die off before September, but before that happens, they produce massive amounts of the best tasting tomatoes you will ever find.
Probably 40-60 tomatoes. (I dont think that they are determinate)
I am wondering if the heat is a factor, but according to Page 15 my book "How to Grow Juicy Tasty Tomatoes" by Annette Welsford and Lucia Grimmer (in Australia) they are supposed to be more heat resistant than most varieties.
But the leaves always turn yellow & brown and production slows down later in the summer no matter where I rotate them to.
None of the other varieties do that.
Anyways, I wonder if that information may be incorrect and they thrive better in colder weather rather than warm weather (they are from Russia where it's cold in many places) so this year, In an effort to keep them going longer, I'm going to try shading them.
It is well worth the trouble, believe me, they are soo productive and tasty. I'd say that they rival Brandywine, but they out produce my Brandywines by about 700% !!

Gary