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BA-3 Amplifier illustrated build guide
BA-3 Amplifier illustrated build guide
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Old 18th September 2018, 05:17 PM   #151
neno70 is offline neno70
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hi 6L6 I am mounting my scheche following your guide but, I have two questions; first, the small electrolytic c3 on the board BA-3 MUST BE MOUNTED OR NO? , ACCORDING TO THE QUESTION, I CAN NOT SEE HOW TO CONNECT THE CABLES TO THE BA-3 CARD. YOU CAN PROVIDE LITTLE SPLIT TO THE REGION .. thanks
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Old 18th September 2018, 08:20 PM   #152
6L6 is online now 6L6  United States
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BA-3 Amplifier illustrated build guide
The small c3 is a location provided if you choose to use an electrolytic capacitor. You do not need to use it and the other location.

What connections are you not understanding?
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Old 20th September 2018, 10:14 AM   #153
neno70 is offline neno70
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Originally Posted by 6L6 View Post
The small c3 is a location provided if you choose to use an electrolytic capacitor. You do not need to use it and the other location.

What connections are you not understanding?
hi 6L6, x cable connections, now everything is clear to me. But x the chassic ai used a 5Ux400 or 5Ux300? x the PSU not used snubber?
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Old 21st September 2018, 02:08 AM   #154
6L6 is online now 6L6  United States
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BA-3 Amplifier illustrated build guide
I used a 5U 400mm because I had one on hand. You could use a 4U as well.

Do not use snubber.
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Old 21st September 2018, 05:53 AM   #155
neno70 is offline neno70
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I used a 5U 400mm because I had one on hand. You could use a 4U as well.

Do not use snubber.
5Ux300 ?
and too small to dispel the heat ??
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Old 21st September 2018, 01:30 PM   #156
indra1 is offline indra1  Indonesia
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... Do not use snubber.
Any problem?
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Old 2nd October 2018, 08:55 PM   #157
neno70 is offline neno70
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hi, x the mosfet, I bought vishay. now x p1 and p2 what value do you recommend me: 1k ?? thank you
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Old 2nd October 2018, 09:27 PM   #158
Dennis Hui is offline Dennis Hui  Canada
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BA-3 Amplifier illustrated build guide
Quote:
Originally Posted by neno70 View Post
hi, x the mosfet, I bought vishay. now x p1 and p2 what value do you recommend me: 1k ?? thank you
Which Vishay part? IRF610/IRF9610?

If so, I would go with 1K for P1 and P2.
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Old 3rd October 2018, 07:30 PM   #159
neno70 is offline neno70
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Which Vishay part? IRF610/IRF9610?

If so, I would go with 1K for P1 and P2.
IRFP240 and 6xIRFP9240
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Old 3rd October 2018, 07:36 PM   #160
6L6 is online now 6L6  United States
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BA-3 Amplifier illustrated build guide
IRFP240/9240 are standard output devices.

Click the image to open in full size.

In this schematic P101 should be 5k (as shown). To give extra adjustment range R125 decrease to 12K, P102 should be increased to 5K.


On the input board, use 1K pots for P1 P2
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