I have Canary M350 mono's and warm them up for 10 min and run the system on low for 30 min. After an hour it sounds better. I don't know how long these amps are supposed to be warmed up before using. Love the sound.
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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).
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)
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
Oh I almost forgot!!!!
The VAC Renaissance 30/30. I had an original and an Mark II at the same time. That cement my complete disdain toward Kevin Hayers and VAC.
Well, the VAC Renaissance 30/30 blown me away when it worked, but rarely it works right. Ground loop and hum abound. Can’t get rid of it. VAC blamed the tubes, my home circuit, my ears, my intelligence. But I had the Lamm L1 and M1.1 at the same time.... not a hint of ground loop and hum!
The 30/30 Mk II was a beautiful dixie clock ... no matter what tubes I put in, the tubes went on their fire dance ritual. The same tubes didn’t behave like that on the original.
Both are auto-bias. No control in that kind of deal. My plan to bi-amp using two 30/30 blown up in my face. Lost crap load of money to sell them as-is (the money I lost in the sale was still less than the cost to ship them one-way to VAC’s Florida shop, nuff said). Absolutely hated them.
(both VACs were working fine when the seller demo them with all WE300B tubes... which obviously not included in the sale... 8 x WE 300B tubes.... you do the math... I had no choice but sell them and disclose the caveats ...)
In general, due to the questionable QA consistency and wild derivation from the Western Electric 300B tube spec, I’d stay away from any 300B amp that uses auto-bias. The only 300B tubes (outside of WE 300B) I’d use would be from Sophia and Psvane (I love Vaic 300B+ blue bottles too, but they are impossible to find)