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12BH7
optimization instead of 12au7

knowledge base for the classic Dynaco
ST70

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4 posts • Page 1 of
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12BH7
optimization instead of 12au7

by
battradio
» Wed Oct 17, 2012 7:23 pm

Hi to optimize a ST 70 driver board For 12BH7 would R18
need to be changed .

Mark

Mark

battradio

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by
Geek
» Wed Oct 17, 2012 9:38 pm

Depends.... whose ST-70 board?

-= Gregg
=-
Fine wine comes in glass
bottles, not plastic sacks. Therefore the finer electrons are also found in
glass bottles.

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by
battradio
» Thu Oct 18, 2012 12:49 am

http://www.diytube.com/phpBB2/viewtopic.php?t=813
of course

Mark

battradio

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Location: near ST.Louis MO.

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by
Shannon
Parks » Wed Oct 31, 2012 6:03 am

Just ran the sims via John Broskie's TubeCAD. No change is
necessary for subbing a 12BH7 as the long tail phase splitter. The bias voltages
remain unchanged in this arrangement.

But using a 6DJ8/6922 doesn't get
the right voltages as the LTP, and it's lower max voltage rating is a problem.
The bias is more suited for small signals as a voltage amplifier. Unfortunately,
it doesn't have suitable gain for a simple sub in the diytube ST70 driver.

Shannon

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