300B Warmup versus other tube or SS amps?

I let my ANK interstage monos warm up for about 30-45 mins usually while preparing and enjoying dinner. There is some slight improvement after that but not much.

That is surprising.  The heater in most SETs should get the tubes to optimal temperature within about 10 minutes.  I wonder if the heater isn't working right.  

5-10 minutes max for all 300B SET amps I used (and that’s a really long list), idle is fine.

Solid state tend to take more time to be optimal in my prior ownership: 30 minutes minimum (low volume listening needed, idle isn't good enough). The classic Krell and Aragon Class A amps took longer (an hour of low volume listening).

@bsimpson, a bit off topic but can you share what 300b amps are your favorites? You intrigued me with your note that you’ve owned a few. 

What I owned before:

Audion Silver Night

Granite Aspen 800 (2nd best of the brunch)

Audio Note Conquest Monos (best of the brunch)

Mastersound 300B (complete joke of the brunch --- and it's very hard to get this status if you read my VAC 30/30 experience below)

ICL 300B (Softone, from Japan)

An custom 300B push pull from ebay seller chang39 from South Korea (I forgot the brand badge he attached to his creations) (3rd best of the brunch)

CAD-300SEI

An Ming Da (don’t care to remember the model ... still trying to forget the brand name)

A few DIYers ... my (strong) comment is ... don’t buy any DIY 300B amp, period, if you ain’t that interested in paying for any education.

***

What I loaned before:

My bullying audio friend (ex-colleague, rather) once loaned me an Zanden Audio 7000 (??) for a few weeks to prove that this is the one and only tube amp to own: The amp from God, he proclaimed. Unfortunately I only had the Vienna Acoustics Mahler speakers at that time, a truly woeful mismatch. I didn’t dare to listen to it much as I worry about any damage to his amp. So cannot comment on that.

***

Hope this helps