I don't see how they can help. We all know that something around 7:1 will work but if they have info (and want to share) about the exact C800g transformer it can help.
Where to start for an exact accurate version of C800G
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we can guess.
I have not looked inside a real C800G
It looks like a EI hard to tell from pictures on the web.
If someone has dimensions you could figure out the permalloy (from the translation in reply #49) lamination number. Maybe .014" thick?
I would guess it is interleaved, maybe three or five winding layers?
If the wire comes from the USA(from the translation in reply #49) maybe it is from MWS wire?
I have not looked inside a real C800G
It looks like a EI hard to tell from pictures on the web.
If someone has dimensions you could figure out the permalloy (from the translation in reply #49) lamination number. Maybe .014" thick?
I would guess it is interleaved, maybe three or five winding layers?
If the wire comes from the USA(from the translation in reply #49) maybe it is from MWS wire?
Good news. Guy will bring the the mic over the weekend. I will do the general measurments, not windings count, of course. But ratio, DCR, some other magnetics properties and lam's dimmension. It will be enaugh to have idea about this transformer. Stay tuned 
Very interesting, at least for meGood news. Guy will bring the the mic over the weekend. I will do the general measurments, not windings count, of course. But ratio, DCR, some other magnetics properties and lam's dimmension. It will be enaugh to have idea about this transformer. Stay tuned
!
Here we go. As I promised. The guy is actually 8.7:1 ratio.
Builded around the EI35 (or probably EI375, since it's made in USA) but that's almost the same size of the laminations.
It measures approx.730H edit: 600H@ 50hz (primary side) what means high % nickel alloy. Primary DCR=320ohm, sec 29ohm
I hope this helps
Builded around the EI35 (or probably EI375, since it's made in USA) but that's almost the same size of the laminations.
It measures approx.
I hope this helps
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Icantthinkofaname
Well-known member
I don't know how similar it would be but Cinemag has an 8.7:1 transformer, the CMO-15/200CT. I don't see a PDF spec sheet on their site so I don't know if it's still available.
Sescom - Sescom Pro Audio Cables, Converters, Adapters and Extenders - aren't they like the US mirror image of Monacor?
How come they suddenly have a deep knowledge of audio transformers - or is this whole design really just a matter of uninformed overkill, hifi-style?
/Jakob E.
How come they suddenly have a deep knowledge of audio transformers - or is this whole design really just a matter of uninformed overkill, hifi-style?
/Jakob E.
Thank you very much!!!
Now it’s clear .. that I can hardly find such a monster
..There is probably nothing like this as an alternative.
But at least I know what to aim for
.
Sorry, one typo I made. Not 730 but 600H @50hz at primary side. I will edit my post
I think Sescom was just the holding company
Thanks for posting the photo Moby , maybe you could post a few more of the other parts of the mic if you still have it on the bench .
Interesting detail about the transformer , it appears to have an insulated mounting made from perspex , does the core material get grounded to a discrete point in the circuit or just left to float ?
The tube suspension mount might also be worth studying . Very few pics of the mics internals even exist up online .
Interesting detail about the transformer , it appears to have an insulated mounting made from perspex , does the core material get grounded to a discrete point in the circuit or just left to float ?
The tube suspension mount might also be worth studying . Very few pics of the mics internals even exist up online .
Sorry. The mic is returned back. Guys are using it on the daily basis.
IIRC I saw Sescom audio transformer ads in the early The Audio Amateur magazine (1970s)
Original vintage or new "versions". The vintage one is far from the desired value.
LevinGuitar
Well-known member
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The 13101 or any other BV8F recreation (9:1) are more common and have big lamination, so apart from the winding design differences, should do the job pretty well if I'm not mistaken.
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It's not about the ratio, it's about high headroom at the low end as it was suggested earlier multiple times. The one @Gus suggested might do the job.
No, bv8 isn't really an option, as Moby just said, the primary induction is crucial here.
Sowter 7490 maybe?
Pointing to amazing document by @ruffrecords
No, bv8 isn't really an option, as Moby just said, the primary induction is crucial here.
Sowter 7490 maybe?
Pointing to amazing document by @ruffrecords
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