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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 6th April 2020, 09:58 PM   #1651
Ben Mah is offline Ben Mah  Canada
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Babelfish M25, SissySIT - general building tips and tricks
Quote:
Originally Posted by August View Post
Fellow builders, please point me toward a suitable PS board/boards for SissySIT. I want to finish my build and like to order the last parts I need. I already have the case, transformers, boards populated and SITs.
Is this usable? Ebay item #323452303840 Other suggestions welcome.
It appears to be the same as the ones that I used. They were purchased from an ebay merchant.
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Old 6th April 2020, 11:10 PM   #1652
Zen Mod is offline Zen Mod  Serbia
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Babelfish M25, SissySIT - general building tips and tricks
they're OK
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Old 7th April 2020, 08:35 PM   #1653
alazira is offline alazira  United States
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I have some 22uF polymer organic low esr caps. Can they be used for the 6N139 mod? Maybe also for C1/C2 (BD139/BD140 supply)?
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Old 7th April 2020, 10:25 PM   #1654
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Babelfish M25, SissySIT - general building tips and tricks
if you like idea of using them, and they have enough voltage (16 as minimum), they're the best!

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Old 9th April 2020, 09:44 AM   #1655
G600 is offline G600  France
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Babelfish M25, SissySIT - general building tips and tricks
Am I wrong saying that all the trimpots except Iq cannot be measured onboard?
(to verify prescribed settings)
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Old 9th April 2020, 09:59 AM   #1656
Zen Mod is offline Zen Mod  Serbia
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Babelfish M25, SissySIT - general building tips and tricks
they all can be measured on-board

what's important!!!!!!! is, practically, "just" two of them - lower trimpot ( R6, that one leaning to negative rail) in JFet buffer - need to be maxed , and output Iq setting trimpot (P1) which need to be minimized

other two trimpots are not critical regarding starting value, if you follow proper setting procedure ( removed jumper between input buffer and xformer, no load on output)

if you're having trouble deciphering how to check them in situ from top of pcb, either look back in the thread ( covered with sketches) or buzz , and I'll dig them again and post here
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Old 9th April 2020, 10:05 AM   #1657
G600 is offline G600  France
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Babelfish M25, SissySIT - general building tips and tricks
Thanks, I've got the pictures for the two Iq ones.
I'll take a deeper look.

By the way my Cinemags are stuck in some airport somewhere, so plenty of time before first power.

Today I'll test the PSUs!
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Old 9th April 2020, 10:06 AM   #1658
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Babelfish M25, SissySIT - general building tips and tricks
R6 - just measure across R4

it ends something as 27-28-29R maxed
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Old 24th April 2020, 06:59 PM   #1659
alazira is offline alazira  United States
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Quote:
Originally Posted by Ben Mah View Post
Here is a picture of my SissySIT with stacked Antek transformers. I purchased a length of threaded rod and cut it to size, with nuts at both ends to bolt the transformers in place.

Click the image to open in full size.
Hi Ben. I was thinking of stacking transformers. I see the metal pad on the top, but is there also one in between the transformers?
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Old 24th April 2020, 07:35 PM   #1660
Ben Mah is offline Ben Mah  Canada
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Babelfish M25, SissySIT - general building tips and tricks
Yes, there is one between the two transformers.
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