HT-20 Studio - Changing Tubes & Setting Bias

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Joined: Sun Oct 02, 2011 12:00 am

Tue Jul 10, 2012 11:04 pm

First attempt at a How To video .... let me know what you think. :?:

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Location: Emporium, PA

Wed Jul 11, 2012 12:47 am

EXCELLENT Image Do you know what an acceptable, non-harmful range of voltage deviation from the 11.5v might be, as I understand tone variation can be tweaked with the bias?

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Location: Wellesley, Ontario, Canada

Wed Jul 11, 2012 4:28 am

Very nice! Thanks for this!

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Location: Oman

Wed Jul 11, 2012 6:22 am

Great Vid.....i think you have helped plenty of tone-hungry black star users! However, I am still confused, where did the 11.5 come from? is it across all HT range? what about if I want to put KT 77 instead of EL 34? :)

Great vid nonetheless, we need an "Ultimate Guide" thread :D

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Joined: Sat Sep 15, 2012 12:00 am
Location: Switzerland

Tue Sep 25, 2012 8:01 pm

Hey folks!

Great video! I noticed that there is a BIAS and a BAL poti on the PCB of the HT Studio 20. The bias is clear, but what does the bal (balance) poti do, and should this be adjusted as well?

Cheers, Felix

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Mon Oct 01, 2012 3:57 pm

Included with the specs for the 30W Orange Dual Terror.


"Note: The Orange Dual Terror DT30H amp head does not require rebiasing when replacing power tubes."

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Tue Mar 12, 2019 10:02 pm

Thanks for the video.
Where did you get 11.5V from?

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