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The BA-3 as preamp build guide
The BA-3 as preamp build guide
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Old 3rd August 2018, 10:25 PM   #1041
MEPER is offline MEPER  Denmark
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Yes, I have read the article now. I think I understand more and more about JFET operation. Also good to see that output mosfet does not need huge heatsinks. So the 15 K/W I have may work if I just run them at normal bias.
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Old 4th August 2018, 12:33 AM   #1042
Russellc is offline Russellc  United States
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The BA-3 as preamp build guide
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Originally Posted by MEPER View Post
I have ordered an octet. He writes that they are in the 7 mA range.....should be OK I guess (hope)…….
I did the same thing, just discussed it with him first, the "7ma range" he has has some sets closer to 8ma, so I noted for those. I think original article called for 10ma, and a few resistor/pot changes can make a wide range usable. he has them marked on package what measurement they are.

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Last edited by Russellc; 4th August 2018 at 12:43 AM.
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Old 4th August 2018, 12:42 AM   #1043
Russellc is offline Russellc  United States
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The BA-3 as preamp build guide
Quote:
Originally Posted by Hikari1 View Post
Yes, anything BL grade will work.
Yup, "These JFETs were chosen at Idss
figures of 10 mA (Idss is the current that flows when the Gate and Source are at the same
voltage). If you get lower values, you may want to consider higher values for P1 and P2, say
1 Kohm. They are best matched, but P3 can be adjusted to compensate for some mismatch".

I like to get around 8, everything worked with standard values....

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Old 4th August 2018, 10:28 AM   #1044
vcec is offline vcec
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ZenMod:
article , here , if you want addendum
Burning Amplifier BA-3
addendum - -look down at comment #15 , by Mighty Moi :
Burning Amplifier BA-3


Thanks ZenMod - just what I was after!
Cheers
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Old 10th August 2018, 05:17 PM   #1045
ggetzoff is offline ggetzoff  United States
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The BA-3 as preamp build guide
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Originally Posted by Zen Mod View Post
BA3 FE is really at its best when mated with BA3 OS , so working in full gain/swing mode

when adjusted to work as line preamp , it's somewhat constipated

so , it's really best to make it as part of power amp , then use anything simple as line stage - even just decent pot or pot plus buffer will work as charm
Or as Papa hints in the BA-3 article, just make it a power amp itself. The Toshibas are good to 25W.
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Old 10th August 2018, 05:19 PM   #1046
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The BA-3 as preamp build guide
I would leave heavy duty work for output buffer , still

leaving Toshibas in happy realm
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