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Babelfish M25, SissySIT - general building tips and tricks
Babelfish M25, SissySIT - general building tips and tricks
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Old 12th August 2019, 06:34 PM   #921
Zen Mod is online now Zen Mod  Serbia
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Babelfish M25, SissySIT - general building tips and tricks
naah ....... it's less sissy than Sissy

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Old 15th August 2019, 04:35 PM   #922
rhthatcher is offline rhthatcher  United States
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I'm planning to use a single power transformer for a stereo amp with dual bridges, snubbers, and CLC supply. The 2nd set of caps will be split for each channel using the boards in the pix.



Question: Will a single 300VA 18+18V Antek be sufficient?
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Old 15th August 2019, 05:03 PM   #923
Rush is offline Rush  United States
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Originally Posted by rhthatcher View Post
I'm planning to use a single power transformer for a stereo amp with dual bridges, snubbers, and CLC supply. The 2nd set of caps will be split for each channel using the boards in the pix.



Question: Will a single 300VA 18+18V Antek be sufficient?
If you are planning to bias at 180mA per channel like is suggested, I would go with a larger (at least) 400 VA and quad secondaries. Searching Antek's site, I don't see one close to the right voltages until you get to the 800VA with 4 each 20 VAC secondaries. Which is what I used and with my highish SIT right at 4.05 Vgs was over the limit of the of the circuit's biasing with only one channel hooked up.
It would be a lot better to use two 200VA Anteks at 18 VAC, like ZM says. (Or if you already have one 300 VA, buy one more for $41.) You can power each tranny individually, so trouble shooting each channel is less hassle.
Cost difference is only $23 USD and you can stack them using a longer bolt.

Thats what I would do if buying new for this project.

By the way, it is the best sounding amp in my stable at the moment. So worth the little bit extra to do it right.

Rush
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Old 15th August 2019, 05:22 PM   #924
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Babelfish M25, SissySIT - general building tips and tricks
second Antek is best solution , as Rush is saying
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Old 15th August 2019, 06:43 PM   #925
rhthatcher is offline rhthatcher  United States
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Crisis averted. AS-4218 exists. I'm getting one from Antek, and one from 6L6's library of spares. I'll continue with chassis layout. Waiting for ZM's boards (in transit, tracking daily), Cinemags (mfg yet? in transit?), and Anteks.
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Old 19th August 2019, 01:49 PM   #926
Juntuin is offline Juntuin  Finland
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Originally Posted by Zen Mod View Post
sound?
Ok, quick test with fully warmed up amp. First thoughts were huge amount of details and sort of ”black” backround, it’s hard to descripe. I don’t have M2 around now to compare.

Speakers 6ohm nominal that falls way below 4ohm and M25 drives them without a hiccup really good sounding amp! Volume gets higher and higher, suddenly you notice that it’s really loud and still not hurting your ears.

Yes, it definitely was worth the trouble.
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Old 19th August 2019, 02:52 PM   #927
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Babelfish M25, SissySIT - general building tips and tricks
so , nothing else than Berserked M2

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Old Today, 02:49 AM   #928
cal3713 is offline cal3713
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Does anyone know the input impedance of the SissySIT? Trying to figure out what I'll need in my preamp for output capacitors...

Thanks.
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Old Today, 09:44 AM   #929
chede is online now chede  Germany
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Babelfish M25, SissySIT - general building tips and tricks
First post, schematics, R2 -> 100k.

Best regards, Claas
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Old Today, 11:22 AM   #930
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Babelfish M25, SissySIT - general building tips and tricks
you can set it arbitrary

as Chede said - R2 , anything from 10K to 220K
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