[Milsurplus] Free - running osc at 7 MHz

[Hubert Miller]

I have a U.S. Army trans - receiver type BC-156. This is very similar to the "loop set" BC-148 which you may have seen.
The BC-156 however tunes around 5 MHz and has instead of the large loop antenna, a transmitter coil inside, and worked into a wire antenna. 
The transmitter is one type 10, free running, and the receiver, 3x #30 tubes, autodyne.

Now, if the frequency is pruned up to 7 MHz, and using a stiff B+ supply for the transmitter ( about 10 watts, I think ), will this be stable enough to use on the air ? 

I don't have time to run this experiment now. The radio is stored in another state actually. I have not decided whether to just sell it, or to try to use it sometime in future. 
tnx,
Hue