[ARC5] Hello Smart People Again:

[arc5 at ix.netcom.com]

Hello even smarter people.

This simple little 60-hz cross-coupled inverter is commonly published:

http://home.netcom.com/~arc5/inverter.JPG

It uses a 115V to 24VCT (12-0-12) 5A fil transformer 
to produce around 250 V out, which I want to double and
use as a dynamotor replacement.  I've built it with 2N3055s, 
which should handle the current.  I do get AC voltage out, 
for awhile....

I haven't powered it above about 12 volts in.
One of the 15-ohm resistors burns up.  
If I remove it, the circuit still starts but heats-up the 
100 ohm resistors with no output load.
My scope is munged, but i'm guessing both transistors
are on at certain times in the cycle.  
I've swapped the transformer leads (same 15-ohmer still heats)
and I've swapped both transistors, since they're old and 
might be leaking under load.  Unless my whole pile of 
old 2N3055s is leaking, and I suppose that's possible.
I can see (barely) a large spike at the start of each
switch cycle.  Is that whacking my transistors?
What are your ideas?