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Wayne's BA 2018 linestage
Wayne's BA 2018 linestage
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Old 11th February 2019, 03:12 AM   #211
BDP is offline BDP  United States
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Quote:
Originally Posted by labjr View Post
Do the JFEts need to be matched?
See post #132. You can easily check them yourself.

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Old 11th February 2019, 05:33 PM   #212
Russellc is offline Russellc  United States
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Wayne's BA 2018 linestage
Quote:
Originally Posted by 6L6 View Post
You need the K170s, and yes, there is.
Hmm. Seems like we should make use of them. Other than being SMT, why aren't people using these given shortages of regular k170/j74 pieces?

Forgive the off topic, but I'm surprised!

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Old 11th February 2019, 05:55 PM   #213
mpmarino is offline mpmarino  United States
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If one were to stack two circuits for balanced operation.....

Could it effectively convert Bal to SE, or visa versa?

If so, would you have to ground the balanced negative on the SE side?
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Old 11th February 2019, 06:38 PM   #214
DougL is offline DougL  United States
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I watched the Utube presentation of the BA 2018 Line stage.
I learned a lot going through the presentation and schematic.
My question is application related. What was the BA 2018 designed to drive?
I am guessing F4 / MOFO type circuits.
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Old 11th February 2019, 09:32 PM   #215
wayne is offline wayne  United States
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Wayne's BA 2018 linestage
It wasn't really designed to drive anything in particular more of just a experiment. It will drive quite a few things though especially with the bigger outputs.
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Old 11th February 2019, 10:51 PM   #216
gary s is offline gary s  Australia
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Wayne, if one were to use the bigger output transistors, what other components would need to be changed and what would be their new values?

Thanks in advance.
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Old 11th February 2019, 11:09 PM   #217
wayne is offline wayne  United States
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Wayne's BA 2018 linestage
Change the 27 Ohm emitter resistors to 15 Ohms and double the output current.
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Old 11th February 2019, 11:14 PM   #218
gary s is offline gary s  Australia
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Thanks for the very quick reply Wayne.
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Old 12th February 2019, 12:19 AM   #219
Dennis Hui is online now Dennis Hui  Canada
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Wayne's BA 2018 linestage
I worked on mine over the weekend using the kit kindly supplied by 6L6.
It's not quite done yet since I have yet to test it. I hope to be able to
do that this coming weekend.
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Old 12th February 2019, 12:38 AM   #220
6L6 is offline 6L6  United States
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Wayne's BA 2018 linestage
Looks good! Test, listen, enjoy, and report back.
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