Originally Posted by
Exsecratio
HPC Lasers here in the UK do a *call off* system, you buy a tube (or rather pay for it) then when the time comes you need it as a replacement they send you one from their latest stock.
Works very well as you are assured a fresh tube when you need it.
hpclaser.co.uk
(I don't work for HPC or any of it's subsidiary companies)
My last Bejing EFR tube lasted a little over 5,300 hours before finally giving up (it wasn't considered a long life tube like the reci's either)
best wishes
Dave