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Old 29th December 2020, 06:30 PM   #1
oodi is offline oodi  Canada
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Location: Sioux Lookout, Ontario
Default Mini Crescendo worth reviving?

I am finally getting back into audio gear. Raising kids has life go off in different directions? Back in 1984 I built the Mini Crescendo from Elektor plans but my own board layout. I built it in Germany before my move to Canada. It was last powered on around 1998. The toroid on the build is a 220V type which wont work too well on our 110V here.

Question, if I picked up a new Hammond Mfg transformer I am stuck choosing the 60V or 80V Center Tapped. I am leaning towards 2x30V. Considering itll be over $100 and the filter caps also need replacing I am wondering if this venture is even worth it?

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Old 29th December 2020, 06:41 PM   #2
Mooly is offline Mooly  United Kingdom
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Mini Crescendo worth reviving?
If it doesn't work out then the 30-0-30 transformer could be used for something else such as an LM3886 based amp (edit... a bit marginal perhaps for an LM3886 but there are lots of other designs). I wouldn't go any higher voltage wise.

The reservoir caps might be old but that doesn't mean they are no good. I would use a DBT (dim bulb tester) for initial powering up and do a quick check that the DC offset is zero at the speaker terminals.

A 220v 50Hz transformer on 110 volts 60Hz should work without issue... give it whirl... a low powered Micro Mini Crescendo.
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