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Success Stories If you have successfully repaired or restored a piece of equipment, why not write up what you did and post details here. Particularly if it was interesting, unusual or challenging. PLEASE DO NOT POST REQUESTS FOR HELP HERE!

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Old 13th Nov 2018, 5:06 pm   #1
tamemin
Triode
 
Join Date: Jul 2018
Location: Oxfordshire, UK.
Posts: 29
Default McMichael 471 Restoration

This was my second restoration. It is a 5 valve inc power supply rectifier.

The transformer had a bad voltage change contact, the reservoir cap was really leaky. I fixed the contact and replaced the cap. So far so good.

On the main chassis, I found that most of the wax capacitors 0.1uF or higher were really leaky, so replaced those with new polyester ones. There is a screened (metalised) IF amplifier tube in there, which I found had lost it's screening, due to general rot. I found I was able to temporarily wrap it with aluminium foil, and earth, which worked!

The magic eye was pretty much worn out, which was a shame, as I was looking forward to seeing that in action.

I managed to find new old stock replacements for the EM34 magic eye and the EF39 tube.

So, with that lot in place, it was pretty much good to go.

I didn't do a lot with the cabinet, just a bit of danish oil, and I also tried to clean the speaker clock (damaging it in the process)

I'll have another go at the cabinet when I have time.

At the moment, I'm fairly happy with getting the electronics working.

Pictures attached

Cheers

Tam
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Old 13th Nov 2018, 5:35 pm   #2
Andrewausfa
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Location: St Ives, Cambridgeshire, UK.
Posts: 922
Default Re: McMichael 471 Restoration

Nice work. Grille cloth is a nightmare to get within these shores.

Andrew
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Old 13th Nov 2018, 6:41 pm   #3
vinrads
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Join Date: Feb 2009
Location: Chesterfield, Derbyshire, UK.
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Default Re: McMichael 471 Restoration

Very nice Tam I must say the EM34 look very bright indeed ,you should be able to obtain some speaker cloth in keeping with the original, keep up the good work .Mick.
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