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Old 11th October 2002, 03:30 AM   #1
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Default Is this a C core OPT?

Click the image to open in full size.

It has both the primary & the seconday wrapped together -- it is a 10W EL86 PP for 800 ohm philips speakers.

dave
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Old 11th October 2002, 01:15 PM   #2
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I always though 800 ohm speakers were driven by OTL amps in the Philips radios.

C-core trannies usually have primary and secondary on the same assembly with the core around it. This is a type I've never seen before, where's the core anyway? Seems this would have poor coupling capabilities...

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Remco
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Old 11th October 2002, 01:47 PM   #3
HDTVman is offline HDTVman  United States
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Hi Gents

Looks like a lumpted toroid with a laminated core to me, but what do I know.

Later
Bruce
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Old 11th October 2002, 03:01 PM   #4
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Default You can "C" the gap.

Yep, they're C cores alright. At the bottom of the picture on the left you can see the small gap where the two halves of the core butt together. Two C shaped halves that face each other. They are made in a similar way to a toroid by winding a long strip of metal in a sort of square shape around a square thing. Then they are varnished and cooked. Then the core is cut into two halves and the abutting surfaces are polished to a smooth finish so they will fit together with minimum airgap (assuming an airgap is not wanted as in a conventional tranny).

GP.
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Old 11th October 2002, 03:06 PM   #5
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Oh, right. I through it was two windings perpendicularly crossed. Must be a slow day for my brain.

Still don't get why one would want to use an OPT for 800 Ohm speakers...

Remco
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Old 11th October 2002, 04:54 PM   #6
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it vaguely resembles a TV flyback tranny
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Old 22nd October 2002, 01:38 AM   #7
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Default PHILIPS

Dave,

Sorry but I somehow lost track of this.
in case you're still wondering:

These are definitely C-cores probably pull-outs from a Philips OTL.
These amps allowed for either low-z OPT couplig or C coupling to a 800R speaker.
I modded a few of those (in my less lazy period) and you can actually get pretty good sound from them even on more conventional speakers.
The circuitdiagram shows how they were operated with a pair of
EL86's.
I'm going to mail you that diagram.

Greetz,
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Old 22nd October 2002, 02:43 AM   #8
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Default Re: PHILIPS

Frank's picture is attached. I put these up on eBay and an astute bidder has informed me that these are double chokes for a Philips OTL. The amp, which had unquestionably had the smoke let out, is from a Philips organ and drove a 2-way 800 ohm speaker (12" + 6x8" whizzer cone mid-tweeter).

dave
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Old 23rd October 2002, 12:25 AM   #9
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Default PHILIPS

Guys,

Any of our Dutchmen knowing of an online archive of Philips circuit diagrams to help Dave with this?

Thanks,

P.S. Headphone fans and SRPP afficionados take a good look:
very first SRPP used in an output stage!
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