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Old 13 February 2021, 18:00   #21
jbenam
Italian Amiga Zealot

 
Join Date: Jan 2009
Location: Italy
Age: 33
Posts: 1,372
Here we are, I have finally cracked it open.

C3 220n 250V
C4 220n 250V
C23 100uF 400V
C215 47uF 250V
C17 47uF 250V
C20 470uF 35V
C214 470uF 35V
C7 100uF 25V
C404 100uF 25V
C405 100uF 25V
C8 100uF 25v
C301 470uF 35V
C317 100uF 63v
C601 10uF 50v
C311 2.2uF 63v
C307 10uF 50v
C501 3u3 160V
C216 4n7 2000V
C217 1u 250V
C500 15n 160V
C313 1000uF (I think?) 25v
C306 1000uF (this is for sure) 25V

I have missed some, as they were difficult to reach. I hope these will be enough.

I have also got some pictures, which I have attached to this post.

Please let me know if you need anything else

BTW, I have attached the other M1348's tube on the other M1348s, no purple issue after a few hours... It looks like it's the tube I wonder if I can get a replacement or if there are any places which can refurbished them?
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Last edited by jbenam; 13 February 2021 at 18:09.
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Old 15 February 2021, 09:59   #22
Retrorepair
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Join Date: May 2020
Location: Rochford
Posts: 21
That's the third version I've seen of this board! It looks quite different to mine in a lot of places but it would seem the circuit is actually very similar, just a different layout.

The cap values are invaluable, thank you for that! I'll update if I can get this thing doing what I want it to

Regarding your tube that's bad luck, I would usually suspect the tube last. Sounds like one of the guns has had it.

You can get (quite expensive now) a tube rejuvenator but you may be better off sourcing an Acorn AFK-50 monitor as the tube should match. Actually they are good for spares as they are almost the same monitor.
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Old 15 February 2021, 14:21   #23
jbenam
Italian Amiga Zealot

 
Join Date: Jan 2009
Location: Italy
Age: 33
Posts: 1,372
Quote:
Originally Posted by Retrorepair View Post
That's the third version I've seen of this board! It looks quite different to mine in a lot of places but it would seem the circuit is actually very similar, just a different layout.

The cap values are invaluable, thank you for that! I'll update if I can get this thing doing what I want it to

Regarding your tube that's bad luck, I would usually suspect the tube last. Sounds like one of the guns has had it.

You can get (quite expensive now) a tube rejuvenator but you may be better off sourcing an Acorn AFK-50 monitor as the tube should match. Actually they are good for spares as they are almost the same monitor.
Luck had it that the same day I did this at my friend's house I had also brought another CRT I had bought (which I decided not to keep) for 10€. It was an offbrand CRT (Yang / Colorsonic) and while leaving my friend suggested to crack it open and... Voilà, it was the same exact tube as the Microvitec!

I did a tube swap and it has now been working for a few days with no issue. Fingers crossed that it will stay like that

If I knew about this before I might have avoided purchasing another 1438s

I hope those infos will be useful to you
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