How do you rebias an HT-40?

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How do you rebias an HT-40?

Post by clay49 on Mon Jul 26, 2010 10:40 pm

Ok...I've read that I have to rebias when I put new power tubes in, but how is it done? I've removed the chasis, and found the pots, but where are the contact points for my multimeter? I've biased other amps, but each one is a little different. Anything available on this???

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Re: How do you rebias an HT-40?

Post by MusashiChan on Tue Jul 27, 2010 9:35 am

Blackstar still don't have made the schematics available...do you have a picture of the board ???

But....take this with caution....my amp tech said to me that they don't need to be rebiased, for my Artisan, they seem to be cathode biased...it's the case on the ht 20 :

http://www.guitariste.com/forums/amplification,blackstar-amplification-user-s-club,272095,190.html

It's in french, but it's sure for the ht 20, no reason not to be the same on the ht 40...me with my Artisan, i have no issue, tubes seems to be at a nice level, and no buzz is audible, so i think it's the same too.


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