[Repeater-Builder] Zetron 38 vs. 38a

[mthoeft]

Hello and thanks for having me on the group
Does anyone know/is there any difference between a Zetron Model 38 and 
Model 38A, aside from the obvious descriptor change?
I can only find a manual on the Zetron website for the 38A and want to 
know for sure before buying a 38 that it is the same/very similar animal
Thanks in advance