H82 Amplifier module

[kevhart]

Hi all, I am new here and need a little help.
I am a volunteer at a Repair Cafe and a lady came in with a Wurlitzer Amplifier module, H82 (WP111) that keeps blowing fuses. The husband was working on it, but has developed Cancer and so cannot continue.

I am have got as far as seeing that the primary windings on the transformer has a resistance of only 3 Ohms....which would give a power of 21kW...explains why the fuse blows.

I don't think it's going to be easy to find a original part and so think best was forward is a new modern transformer. For this I need to know is what are the two secondary voltages and what load they would be.

I am doing this free as a volunteer, so any help would be so great fully accepted.

These are pictures of the Amp.

postimg.cc/gallery/Sj3dr0n

[jukenorman]

I don't think that I have a schematic for that amplifier. But there is usually a filter across across the mains input winding which I would wager is likely to be your problem (sticking my neck out here lol!) because I think the transformer would shou more visible signs of distress if the primary winding was actually 3 ohms. It's up to you whether you replace the filter, there are plenty available for use on domestic appliances. Let us know what you find.

Norman.

[kevhart]

Thanks Norman as you were right in that the filter is shot, but I have taken it out of the Circuit and the resistance is still only 3 Ohms.
I did check the secondary European socket which is across the transformer but it is good and clean.
Any ideas for next step?

[jukenorman]

It was worth a try! Are you on 240VAC? I see that there is a pair (grey) connected to the 240V taps, 1-3, but there is also a pair (white) connected to the 220V taps, 3-9. and I'm not sure why that is. Either trace out or disconnect the pair that's not your supply voltage pair - last throw of the dice - see if that makes a difference?

Norman.

[kevhart]

Yes did that. they appear to be for the European socket that sits next to the transformer. I am running at 240V in the UK. I assume this socket allows another module in the jukebox to be powered with 220v by using the primary windings?

[jukenorman]

As they say, when all else fails, check the manual - the 220V tap would be for lighting! It does look like a bad transformer then! The nearest manual I have is about five years older than your amp so I'm not sure how similar the amps would be? And the amp also contains the power supply parts for the jukebox (just so you know). I looked on jukeboxparts.co.uk, there is an untested amp there for £50.

Norman.