Welcome to Australia's only Vintage Radio and Television discussion forums. You are not logged in. Please log in below, apply for an account or retrieve your password.
Australian Vintage Radio Forums
  Home  ·  About Us  ·  Discussion Forums  ·  Glossary  ·  Outside Links  ·  Policies  ·  Services Directory  ·  Safety Warnings  ·  Tutorials

Vintage Television

Forum home - Go back to Vintage Television

 Astor 23 inch television restore - Seeking schematic for R31G-A/4W chassis
« Back · 1 · 2 · Next »
 Return to top of page · Post #: 16 · Written at 9:44:25 AM on 5 December 2016.
Ian Robertson's Gravatar
 Ian Robertson
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 2369

Hmmm, your chassis must have been an early build.

Not all polyester caps are created equal. For anything around the boost and hor linearity, because of the amount of current they are handling, you need foil wound caps, not MKT or metallised polyester. You "dud" might have been OK in another place.
 
 Return to top of page · Post #: 17 · Written at 11:19:11 AM on 5 December 2016.
Sue's avatar
 Sue
 Location: Daylesford, VIC
 Member since 13 January 2011
 Member #: 809
 Postcount: 326

The foil caps would generally be the axial tubular types, rather than the flattened radials like the greencaps?
 
 Return to top of page · Post #: 18 · Written at 1:11:56 PM on 5 December 2016.
Ian Robertson's Gravatar
 Ian Robertson
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 2369

Yes, but not necessarily! I have some excellent large "greencaps" that are ex-Pye close-down stock. They are designed to handle amps, did so in Pye CTV hor deflection and were never known to fail, ever.

Go for a part that's physically large for its capacitance and voltage. Treat with suspicion anything that's less than half the size of the part it's replacing - I'm referring to original parts dating from late - mid 1950's and later here.

If the original is a 630v cap, replace it with a 1kV or higher part. That usually keeps you out of trouble.
 
« Back · 1 · 2 · Next »
 You need to be a member to post comments on this forum.

Sign In

Username:
Password:
 Keep me logged in.
Do not tick box on a computer with public access.

Vintage Radio and Television is proudly brought to you by an era where things were built with pride and made to last.

DISCLAIMER: Valve radios and televisions contain voltages that can deliver lethal shocks. You should not attempt to work on a valve radio or other electrical appliances unless you know exactly what you are doing and have gained some experience with electronics and working around high voltages. The owner, administrators and staff of Vintage Radio & Television will accept no liability for any damage, injury or loss of life that comes as a result of your use or mis-use of information on this website. Please read our Safety Warning before using this website.

WARNING: Under no circumstances should you ever apply power to a vintage radio, television or other electrical appliance you have acquired without first having it checked and serviced by an experienced person. Also, at no time should any appliance be connected to an electricity supply if the power cord is damaged. If in doubt, do not apply power.

Shintara - Keepin' It Real · VileSilencer - Maintain The Rage