Bias Master BM4 meter

[surfnorthwest]

I have been looking at getting my own bias meter and this one looks to be a great unit. Wanted to check and see if anyone has used this before or their thoughts on it. Basically it will do a 2 or 4 tube bias by plugging their conectors into the tube sockets and then putting the tubes into the conectors. Looks to be real simple. Here is a video on how to use it.

http://www.mojomusicalsupply.com/video-biasing.asp

Measures the current of 4x any standard base octal power tubes (6L6, EL34, 6550, etc). Measures EL84 current with optional noval proble set. See item #4152010 Bias Master EL84 Adapter

[slowpokerhino]

Looks like a good unit, but why pay $240 when you can get the job done for $35?
I got the bias probe and multimeter from Bob @ Eurotubes and it works just fine. Used it to bias my Twin. Just use the multimeter to bias the VM since I have to pull the chassis anyway.

https://ssl.eurotubes.com/cart/index.ph ... ory_id=109

Here's his "How to:" video:

http://www.eurotubes.com/euro-Fender-DeluxeV.htm

[VMGravy]

Looks easy enough, but what do you do if the amp has no bias trim???

[TonyC]

Looks easy enough, but what do you do if the amp has no bias trim???

Then it's probably self adjusting.

[surfnorthwest]

I am still waiting for somebody to step up to the plate a make a good bias video for the VM here so we can post.

[LivewireBlanco]

Looks easy enough, but what do you do if the amp has no bias trim???

Then it's probably self adjusting.

Actually, there are a lot of old school amps out there with no bias pot. You have to actually replace the resister on it to change the bias.

[TonyC]

Looks easy enough, but what do you do if the amp has no bias trim???

Then it's probably self adjusting.

Actually, there are a lot of old school amps out there with no bias pot. You have to actually replace the resister on it to change the bias.

Ouch!