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Wayne's BA 2018 linestage
Wayne's BA 2018 linestage
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Old 22nd January 2019, 10:25 PM   #111
mimba is offline mimba
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Join Date: May 2013
I checked the transistors several times. No mistakes here. The led in on, working correct. Maybe i should change the 992 in the output stage, maybe its damaged...
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Old 23rd January 2019, 12:12 AM   #112
BDP is offline BDP  United States
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What's the voltage drop on the LED? Should be close to 2 volts. Also what is the Vbe on the output Transistors.
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Old 23rd January 2019, 09:24 PM   #113
mimba is offline mimba
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Hello,
first of all i want to thank you for your input! After changing Q10 the circuit works as expected. I can now measure an voltage drop over R11/12 of 0,33V, over the diode its 1,85V. Q10 and Q8 are getting quite hot, so i will lower the rails a little.
Best regards,
Michael
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Old 24th January 2019, 01:53 AM   #114
takitaj is offline takitaj  United States
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Location: Maine
Congratulations on getting it running! What are you using for rail voltages?


TJ
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Old 24th January 2019, 08:50 AM   #115
mimba is offline mimba
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I'm using my Whammy PSU for the tests of the preamp. It's quite the same as the original design, except i built it as an variable supply and changed one or two capacitor values. Added two pictures...
Attached Images
File Type: jpg Whammy.jpg (190.7 KB, 471 views)
File Type: jpg Pre.jpg (310.9 KB, 467 views)
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Old 24th January 2019, 12:08 PM   #116
Mod Man is offline Mod Man  United States
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Who can turn a surface mount transistor into a through hole, Mimba can.:-)
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Old 25th January 2019, 01:20 AM   #117
BDP is offline BDP  United States
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Did you select Idss for the Jfet CCS or just used what you had on hand? Your voltages were right in line with Wayne's.

BDP
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Old 25th January 2019, 09:21 AM   #118
mimba is offline mimba
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Join Date: May 2013
No, I did not matching. Neither transistors, nor resistors. I wanted to build the circuit as fast as possible to have a basis to experiment with an balanced solution... By the way: I measured a gain of 12db. Can somebody confirm? Because Mr. Colburn says in the BAF video, gain should be 15db.
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Old 26th January 2019, 06:24 PM   #119
BDP is offline BDP  United States
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Kit arrived. Thanks Wayne and Jim

BDP
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Old 26th January 2019, 06:54 PM   #120
Russellc is offline Russellc  United States
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Join Date: Mar 2003
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Wayne's BA 2018 linestage
Kit arrived here too, Thanks Wayne and Jim!

Russellc
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