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Discussion in 'The Workbench' started by Hard40sta, Oct 18, 2020.
I googled some old MF threads that say they were discontinued.
I know I might be a little hot, I actually called The Tube Store told them my numbers, they thought they would be fine for their tubes. So far no red-plating, over the last month or so, just the best sound ever out of this amp.
I got a Eurotubes bias meter. Same basic thing. Does 1 tube at a time. It was like 100 bucks. Shows PV and bias current. Still have to open up amp to adjust but hey, it's miles easier.
Serious question tho...
so if you have to open up the chassis and adjust the little bias thingy anyway...what is the benefit of it?
Is it doing something else for you that a multimeter won’t? Just trying to figure out how these things work as opposed to the “traditional” way...
edit: I watched some videos and it looks like the thing does the plate voltage and milliamps equation for you. All you have to do is adjust the bias pot to the desired tube reading. Is that correct?
Also, adjusting bias on one side affects the other. It's a balancing act to get both sides close to same DC millivolts.
You have to find the balance yes,but the voltage on the plate what has to do with the tubes adjustment,even its going up or down,i don't get it..(sorry but im new to this,just bought my first tube amp and im on the same way)
I've not done this myself but figured it may be worth looking into for some.
If at all possible, take it to a technician and see if they will let you watch how they bias. There are important steps to prepare for biasing that you need to know. It can be dangerous. Learning to read a schematic and knowing how the power section works by having someone show you is a great start.
It beats taking MM probes and touching live contacts on tube sockets firstly. Simply plug in, heat up, I still do tye math quickly but it measures the PV and current. Easy peasy,no MM, no poking atound inside with probes.
I love the smell of arcing mulit meter probes in the morning...................
That exposed voltage thingy could be very dangerous. I would rather use a meter inside the chassis.
But you’re still poking around the bias pot correct?
Hopefully they’ll stay selling those again soon.
That is the best advice I have read...There were 3 guys quoting 3 different Bias voltages!
Yeah. Relatively way safer to turn a small pot w a screwdriver though, to me, than connecting meters to live sockets. It elimates those steps. Totally worth it to me. Eurotubes likely still does.
I like bias points and adjustments on the outside better still.
I need to get one. I called them and they said they should be ready for sale again in about 2-3 weeks.
I find it really easy. Esp when you have a few amps to bias here n there
I also like that you can play the guitar while the thing is hooked up so you can tweak on the fly without disconnecting it.
Good point. I have done that to set by ear but know I am in a safe area of bias.
I know you know good tone, Jet. So if you like this bias thing, it’s good enough for me.
Thanks! Well it is convenient.