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Wayne's BA 2018 linestage
Wayne's BA 2018 linestage
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Old 13th April 2019, 03:14 PM   #611
Russellc is offline Russellc  United States
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Wayne's BA 2018 linestage
You will like this one, I'm still switching it from Amp to amp and speaker to speaker. Once utterly familiar. I am going to put BA3 back in and rotate it noting differences. Then try version with large outputs, (boards all complete) and compare it.

Russellc
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Old 13th April 2019, 08:15 PM   #612
william2001 is offline william2001  United States
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Couldn't leave well enough alone so I went ahead and wired in those Jensen autoformers. Works great, the extra gain is really nice. This cobbled together line stage sounds "real decent"!
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Old 16th April 2019, 12:59 PM   #613
DramBrad is offline DramBrad  United States
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Default Big Outputs

Can anyone recommend a reliable supplier for a pair of KSA1220s. Mouser, Digikey and Allied have none in stock.
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Old 16th April 2019, 03:46 PM   #614
MEPER is offline MEPER  Denmark
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Same with RS Components. 25 pcs package will be back end June.


I got the two pink boards today!
Thank you very much!


I also have a hot air solder/de-solder station on the way!
Hope I succeed with smd without the paste.
Never "go down" on tools as we say……..
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Old 16th April 2019, 04:14 PM   #615
chede is offline chede  Germany
... fascinated by amps
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Wayne's BA 2018 linestage
I bought 2SA1220 (Inchange Semi) from Kessler Electronics in Germany, along with the 2SC2690, also from Inchange Semi.

Working well (so far only bench tested with signal generator).
I was able to match hfe 144 one species to 181 the complementary species (forgot which was which ).

2SA1220A-Q
2SC2690

The website seems only to be in German, unfortunately.

Hope this helps,
best regards, Claas
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Old 16th April 2019, 04:32 PM   #616
6L6 is offline 6L6  United States
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Wayne's BA 2018 linestage
KSA1220 in small quantities appear to be difficult to find. I’m looking into getting some when a kit is offered for the future store PCB. If there’s sufficient interest the transistors themselves or a small kit could be made that would have the transistors and the other associates bits. (Emitter resistors and feedback cap)
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Old 16th April 2019, 04:52 PM   #617
Russellc is offline Russellc  United States
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Wayne's BA 2018 linestage
Quote:
Originally Posted by 6L6 View Post
KSA1220 in small quantities appear to be difficult to find. I’m looking into getting some when a kit is offered for the future store PCB. If there’s sufficient interest the transistors themselves or a small kit could be made that would have the transistors and the other associates bits. (Emitter resistors and feedback cap)
I have whatever extra parts from ordering your BOM from mouser, but used the "large" outputs and associated parts.....do I have an extra pair? (not home right now to see what they are, but I had some left over bits) Seems like there were 10 of some items but only needed 8?

Russellc
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Pass B-1 preamp, Pass BA3 preamp, Wayne's 2018 LS, Pass F-5 Amp, Pass F-6 Amp, Pass BA-3 Amp, Pass M-2 amp, Pass Aleph J amp, Pass Pearl 2 Phono pre Tekton Enzo, Altec A7, Econowave JBL 2235H & B&C CD
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Old 16th April 2019, 10:50 PM   #618
DramBrad is offline DramBrad  United States
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Default Big Outputs

I saw another post on DIY that said Arrow Electronics has KSA1220s in stock. I may check them out but I'm not sure they cater to small orders. Thanks All
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Old 17th April 2019, 02:21 PM   #619
chede is offline chede  Germany
... fascinated by amps
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Wayne's BA 2018 linestage
Yesterday, the case arrived that I intend to house Wayne's BA 2018 linestage in:

Wayne's BA 2018 linestage-wayne-ba-2018-linestage-jpg

That case already comes as a passive preamp, with 128 step relay-based volume control and 4-way input switching, also remote-controlled via a supplied infrared remote:

Wayne's BA 2018 linestage-comes-passive-preamp-jpg

I will use a separate PSU for this preamp. That will be configurable to also serve other future preamps. So, making room for the gain stage boards (relay board will also be moved closer to the back panel):

Wayne's BA 2018 linestage-gainstage-boards-jpg


PSU build will commence once two more shipments from China have arrived. I also have to order a transformer from Toroidy and a case for the PSU from Modushop. After the Easter break ...

Best regards,
Claas
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File Type: jpg Case comes as passive preamp.jpg (413.3 KB, 141 views)
File Type: jpg Making room for gainstage boards.jpg (372.8 KB, 139 views)
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Old 17th April 2019, 02:49 PM   #620
6L6 is offline 6L6  United States
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Wayne's BA 2018 linestage
I’m very excited to see how this works!

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