[Amps] Is there any VISIBLE difference of 4CX1000A and 4CX1500B ??

[Ulli Grunow]

Hi there,
Can someone tell me, how to distinguish visually a 4CX1000A from a
4CX1500B from outside ?!?
 
There is no printed label anymore visible. The tube in question is used
and comes from a marine equipment manufacturer DEBEC (Germany)
 
Is there any difference, so that looking on the tube we can definitely
say that it is a 4CX1000A or 4CX1500B ?!
Is there a sinple electrical test probably so we can find out ?
 
Please let me know.
 
Thanks for info.
 
Ulli, ON5KQ