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Old 18th Oct 2019, 4:37 pm   #25
cathoderay57
Nonode
 
Join Date: Oct 2017
Location: Bristol, UK.
Posts: 2,364
Default Re: Bush AC11 - Newbie Project

That's right. You'll need a multimeter on the AC volts range capable of at least 250v. If the max secondary voltage is around 200v AC that's a good sign but keep a lookout (and sniff out) for transformer burning. If you see or smell smoke then turn off power immediately. Don't leave it running for any length of time unattended.

If, as I suspect, there is a winding short then option 1 is you'll need a replacement transformer. These sets are fairly common so if you post a request in the parts wanted section you might find somebody with a scrap set willing to salvage the mains transformer for you. Second option is to get it rewound and Ed Dinning on this Forum can probably do it for you for a fee. However, let's do the power test first.

Be careful removing the rectifier (and any of the other valves). Some have a metal skirt which isn't a problem but the ones with a moulded glass base are held in place by a small glass pip that slips behind a metal wire spring on the valveholder. If you yank out the valve it is easy to shear off the glass pip and the valve then loses vacuum and is useless. Take care and release the wire spring first if poss.
Cheers,
Jerry

Last edited by cathoderay57; 18th Oct 2019 at 4:45 pm.
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