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| Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
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6th Jun 2021, 4:12 pm
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#1 |
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Heptode
Join Date: Nov 2018
Location: Staffordshire Moorlands, UK.
Posts: 595
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Output Transformer Mullard MAS4/Philips 790A
Good afternoon all.
Do the two wires that come from the output transformer to the speaker circuit have polarity? Brian |
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6th Jun 2021, 4:48 pm
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#2 |
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Rest in Peace
Join Date: Mar 2011
Location: Basildon, Essex, UK.
Posts: 4,100
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Re: Output Transformer Mullard MAS4/Philips 790A
The 2 wires out of the transformer have negative feedback and tone correction connected to them, so yes they do have polarity, You don't want to reverse them or you may get horrible noises in the speaker.
But the actual wires to the speaker are not polarity sensitive. Mike |
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6th Jun 2021, 5:00 pm
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#3 |
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Heptode
Join Date: Nov 2018
Location: Staffordshire Moorlands, UK.
Posts: 595
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Re: Output Transformer Mullard MAS4/Philips 790A
Thanks Mike.
I'm not 100% sure they are wired to the speaker circuit correctly; what is the best way of checking? Brian |
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6th Jun 2021, 5:12 pm
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#4 |
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Heptode
Join Date: Nov 2018
Location: Staffordshire Moorlands, UK.
Posts: 595
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Re: Output Transformer Mullard MAS4/Philips 790A
Hi Mike, just read again and understand now, so all clear now.
Thanks. Brian |
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