Which bias probe do you like?

[Shreddy Mercury]

Well if the damn tubes on my 3rd Power I just got aren't farting out and dying...

Anywho, I probably need to grab some new EL34s and pop them in. What bias probe do you guys like that makes it easy to dial up all your amps?

 

[Alpha Stryke]

So you're an "amp tech" are ya ?

 

[Rackman]

I've got an older Eurotubes one. No complaints.

 

[ilikehats]

I've got an older Eurotubes one. No complaints.

Same, mine is probably 15 years old. My only complaint is wishing I had a pair of them.

 

[Jakem]

Eurotubes one and it’s working well. I also bought the bias probe heads from them to be used with a multimeter but my Fluke was missing when I checked the bias of my 1987x. Now the Fluke is found so next time I’ll use that as well.

 

[griff10672]

Same, mine is probably 15 years old. My only complaint is wishing I had a pair of them.

same here

 

[Shreddy Mercury]

Too bad ET doesn't make one that measures two tubes at once, a'la 40-50 watt amps

 

[griff10672]

Too bad ET doesn't make one that measures two tubes at once, a'la 40-50 watt amps

that's why having two of them is ideal ...... I have the Pro 1 and the simple adapter for the MM ..... that's how I do both sides ...

 

[70 Mach 1]

Euro tubes works fine.

Except my tech knows i use it.
When i bring it in for unrelated service i get the infamous call this and that is shot and my bias has to be reset

The when i check it myself the next day its the same damn 38mA i had it at

I think hes just messing with me

 

[griff10672]

you can also get one of those ones that does all 4 tubes at once ..... the only problem with those is .... they don't give you your plate voltage .... so if you don't mind grabbing your plate voltage with a MM those will show you readings on all four tubes at once

 

[ilikehats]

The "all 4 at once" device rules. I just don't do it enough to justify the cost. The Pro 1 is great though. Again, if I had reason to do it more than a couple of times a year, I would probably snag one of those.

 

[Alpha Stryke]

Class AB "push / pull" thermionic valve amplifiers should be biased in "pairs" in relation to plate voltage.