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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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17th Jan 2020, 12:11 pm | #1 |
Hexode
Join Date: Apr 2008
Location: Ramsgate, Kent, UK.
Posts: 252
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Ferranti OPM 6 Output Transformer
Does anyone have any data on the Ferranti OPM 6 push-pull output transformer?
I can see the turns ratios as they are printed on the casing, I assume that these refer to the whole of the primary winding, i.e. 45/1 gives a 6K Anode to Anode impedance when driving a 3 Ohm speaker, which seems likely to be the speaker impedance intended for use with this tranny? No idea of power rating, primary winding current capability, etc. though. Thanks, Adrian |
17th Jan 2020, 12:29 pm | #2 |
Hexode
Join Date: Mar 2008
Location: Bristol, UK.
Posts: 388
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Re: Ferranti OPM 6 Output Transformer
A bit of info
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17th Jan 2020, 1:07 pm | #3 |
Hexode
Join Date: Apr 2008
Location: Ramsgate, Kent, UK.
Posts: 252
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Re: Ferranti OPM 6 Output Transformer
Many thanks for that info.
The 120H inductance at 100mA does seem a little unbelievable, I have just measured mine, the primary winding is about 400 Ohms total and its inductance @ 1KHz, no DC measures about 20H, unless of course my transformer has shorted turns :-(( Adrian |
17th Jan 2020, 1:10 pm | #4 |
Rest in Peace
Join Date: Mar 2010
Location: Berkshire, UK.
Posts: 72
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Re: Ferranti OPM 6 Output Transformer
If you can manage to find a copy the Ferranti book "The true road to radio" provides a lot of useful information of all the Ferranti audio products of this era.
Chris |
17th Jan 2020, 1:21 pm | #5 |
Octode
Join Date: Feb 2007
Location: Ely, Cambridgeshire, UK.
Posts: 1,975
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Re: Ferranti OPM 6 Output Transformer
have this
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17th Jan 2020, 1:29 pm | #6 |
Octode
Join Date: Feb 2007
Location: Ely, Cambridgeshire, UK.
Posts: 1,975
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Re: Ferranti OPM 6 Output Transformer
and
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17th Jan 2020, 7:04 pm | #7 |
Hexode
Join Date: Apr 2008
Location: Ramsgate, Kent, UK.
Posts: 252
|
Re: Ferranti OPM 6 Output Transformer
Many thanks for the info chaps, I think that just about covers everything!
Adrian |