RCA AR88lf - UK Vintage Radio Repair and Restoration Discussion Forum

Grix · 12th Aug 2011, 8:45 pm

Hi All.

Just a quick one my AR88 has given up after 10 years and I have found about 5 caps that are U/S. They are xxxx uuf mica. Is it ok to replace them with polyester ones or do I have to use mica?
regards

Grix

ms660 · 12th Aug 2011, 8:59 pm

I would replace mica with mica, but it's your descision, do they read leaky, or, loss of value?

Cheers.

neon indicator · 12th Aug 2011, 9:01 pm

Mica are still available. It depends on the part of the circuit and voltage. Mica are also good and rarely fail (I've only ever seen mechanical damage in over 30 years).

Suitable voltage rated Polystyrene (easily damages during soldering) or suitable voltage NPO ceramic would be more normal alternatives than Polyester.

I'd replace Mica with Mica.

12th Aug 2011, 8:45 pm	#1
Grix Triode Join Date: Nov 2005 Location: Havant, Hampshire. Posts: 13	RCA AR88lf Hi All. Just a quick one my AR88 has given up after 10 years and I have found about 5 caps that are U/S. They are xxxx uuf mica. Is it ok to replace them with polyester ones or do I have to use mica? regards Grix

12th Aug 2011, 8:59 pm	#2
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: ar88lf I would replace mica with mica, but it's your descision, do they read leaky, or, loss of value? Cheers.

12th Aug 2011, 9:01 pm	#3
neon indicator Retired Dormant Member Join Date: Jun 2010 Location: Co. Limerick, Ireland. Posts: 1,183	Re: RCA AR88lf Mica are still available. It depends on the part of the circuit and voltage. Mica are also good and rarely fail (I've only ever seen mechanical damage in over 30 years). Suitable voltage rated Polystyrene (easily damages during soldering) or suitable voltage NPO ceramic would be more normal alternatives than Polyester. I'd replace Mica with Mica.