HT-20 Studio - Changing Tubes & Setting Bias

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teecee90
Posts: 2
Joined: Sun Oct 02, 2011 12:00 am

Tue Jul 10, 2012 11:04 pm



http://youtu.be/PtvsRn9H29Q

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

IM4Tone
Posts: 505
Joined: Sun Aug 07, 2011 12:00 am
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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Markystang
Posts: 191
Joined: Tue Nov 23, 2010 1:00 am
Location: Wellesley, Ontario, Canada

Wed Jul 11, 2012 4:28 am

Very nice! Thanks for this!

KKND
Posts: 770
Joined: Sat May 01, 2010 12:00 am
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

fjonasch
Posts: 9
Joined: Sat Sep 15, 2012 12:00 am
Location: Switzerland
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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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VENTGtr
Posts: 397
Joined: Sat Jun 19, 2010 12:00 am
Location: Central PA/US

Mon Oct 01, 2012 3:57 pm



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

Interesting:

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

Spykerwolf
Posts: 7
Joined: Thu Jan 30, 2014 8:42 am

Tue Mar 12, 2019 10:02 pm

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

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