But in my experience if you know which is the bias pot (possibly the one on the top between the two output valves) you should be able to hear it lower as you tweek it. Having had a pair of push/pull 300B's it can be tricky to get the lowest hum. If you have twiddled the hum pots then what I am about to suggest below may not work or be worth doing. Just a thought you say you only just set them up, were the main output valves marked left and right and/or which amp they came from, or were they transported to your home with the valves left in the amps? If they were marked and you know which pairs are which make sure you have them in the correct sockets(left/right) as the bias would have been set up for them in that configuration. I have an 1 external pot for adjustment but two output valves, does this alter the idling current to both or alter the balance between the two? Is a shunt probe (valve seat insert) necessary as there are no dedicated bias points? Sorry if this seems like elementary stuff, but I get the impression that I may break something/someone/me if I start poking around in an uninformed fashion.
I have read/watched various biasing guides online but they reference parts that are not present on my amps. There is some hum from the amps even after warm up and I understand that this could be due to the bias not being set correctly. I bought a pair of 6g4g monoblocks from Vinylnvalves almost two years ago and embarrassing have only just gotten around to setting them up. I am seeking advice regarding the setup of my first valve equipment.
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