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Post by jcv on Jan 30, 2009 14:03:19 GMT -7
Hi guys. I finally got my dual bias tester and I'm ready to check the bias on my Galaxie. Can you guys tell me where the bias should be set and where the bias pot is? I mentioned in another thread that my Gal doesn't seem as loud as it should. I want to make sure the bias is right and if that doesn't do the trick I'll get new power tubes for it. I want it to be perfect since I will be putting it up for sale. Sadly, I need to sell most of my gear. I'll be posting some good stuff in the BST forum very soon
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Post by kidmagic on Feb 25, 2009 9:43:02 GMT -7
Yeah, I'd love it if someone could chime in on this. I saw a chart which shows the bias s/b between 26mA and 36mA's - that seems like a huge range. Can anyone comment on this?
Also JCV, I'd assume the pot is just like other Z's in that you have to open up the chasis to get at it. Usually pretty easy to spot once you open it up - but I'm always scared to death I'm going to eletricute myself.
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Post by amakitalo on Feb 25, 2009 14:16:30 GMT -7
I use a Weber bias rite, so I cannot help you with any other methods. Yes, you have to pull the chassis out and the bias pot is located on the bottom inside the chassis. Unfortunately I have no pictures of it, but if you know what you are looking for it's pretty obvious. Below is a threat that shows some calculations on the bias. I use a spreadsheet that I downloaded from Myles's website. The spreadsheet does the calculation for you. In my case, using the assumption that each tube was 30W as most modern 6L6's are, I set my bias at around 40ma, which in my house is around 60% of the max dissipation. As others have commented, unless you know what you're doing don't. The guts of your Galaxie can zap you dead. drzamplifiers.proboards41.com/index.cgi?action=display&board=route&thread=19591&page=1
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