Yes! Just like when you run out of gas in your car, just put new in. 73 Jim SM2EKM --------------- Jason Buchanan wrote: > > hi, > > Is it possible to put new 3-500Z(G) tubes in the L4, not L-4B? Would like > to put new tubes in L-4 but do not know what options there are. > > 73 Jason N1SU >