As I already mentioned, I used to have a Mesa 400+ that I bought brand new 7 years ago. I paid $1,500 for it. I kept it for 4 years and I never came to peace with it. I just was never able to get rid of a very dominate nasal sounding mid-range sound. I also found the Mesa to be very complex for tone shaping. It was near 50 lbs! I never was happy with it EVER! Sold it for $950. Lost over $500 bucks with it. Being a tube amp, it left a very bad taste in my mouth. After getting rid of it, I got a Peavey Max 700 and then I got a LMKII. Both SS amps and I loved them both. Their sound and easy of tone shaping. For the price of the Mesa 400+, I could have bought 2 new LMKIIs and still had money left over. The Mesa was supposed to be a 500 watt amp but TBers told me that actually, it's only about 300 watts. Well..........$1,500 for 300 watts or $699 (LMKII) for 500 watts. It's up to the bassist's billfold and wants, I guess.
OK.........You devoted TB bass amp tube "junkies" just about got me wanting to buy a 50 watt to 100 watt bass head! I mean really.
So, I just now went to eBay looking at SVTs, VB 4s, old Bassmans, Showmans, B-15s, Traynors, Mesa 400s etc. Expensive, expensive, expensive! A 100 Fender Bassman (newer one) is like $1,500. SVTs near $2,000 All the other old tube amps are $800 and up to $2,000. For a bass amp with 50 watts to 300 watts!
If one is lucky enough to own an all tube bass. Count yourself bessed.
I'd think a bassist would have to have a lot of money or be a hard core tube amp freek to pay out for a tube bass amp.
But, I understand that for some us, cost is no object when we want to get "a sound".
Unless if one is lucky to find a good deal for an all tube bass amp, THEY ARE EXPENSIVE...........new or old!