Replacement for a 422j 250v capacitor and 223j 150v mylar capacitor

Passives Capacitors
,
1

I am fixing the bias oscillator of a tape

recorder and I need to replace two

capacitors 422j 250v mica and

223j 150v mylar. what are the best

alternatives.

2

Such markings would typically indicate 4.2nF and 22nF respectively, both with 5% tolerance.

Mica caps are largely obsolete/unpopular at this point with ceramics of a C0G temperature characteristic probably the most likely alternative followed by a film of some sort. Something that’s temperature-stable and fits would be the thing to look for, in either case.

These might be some options to consider.

3

Rick,
Thank You for the prompt reply.

I like to restore tape recorders. The passive components you have suggested will help repair the bias oscillator of one of these machines.

I have ordered the suggested parts.

I will let you know how I fared.

Regards,
Dominique.

1 Like
4

Rick,
The 0.022uf capacitor does not work because of high internal resistance. It is not suited for the oscillator circuit.

A low esr capacitor is required. Can you suggest a DigiKey product. I have not been able to locate one with the search.

Regards,
Dominique.

5

Hello dominique.dopera,

Click here for some Low ESR options.

These are the C0G,NPO and the 1206 SMD size.

These are 22nf (22000pf), and 200V or 250V, and range in tolerance from 1%~10%.

Please check the datasheets to verify compatibility to your application.