I don't think VTLs are auto-biased. Having an auto-bias is a great advantage for longer tube life so it's important! BAT is being converted to mono by reconnecting other channel tubes to the one channel path giving 4 tubes per channel as mono version(mentioned by Tom Hankins) Mono version is VK150 and it's pricey new or used. Otherwise a great contender to your consideration with very good built quality.
What is your budget?
How savvy you are with troubleshooting? Most of powerful tube amps are not user friendly, burn tubes fast and require some technical knowlege or if not, sending it to service provider would run into tripple digits just for shipping.
Do you have money-no-option situation?
What speakers do you have?
What is your budget?
How savvy you are with troubleshooting? Most of powerful tube amps are not user friendly, burn tubes fast and require some technical knowlege or if not, sending it to service provider would run into tripple digits just for shipping.
Do you have money-no-option situation?
What speakers do you have?