UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Roberts RT7

Station X · 9th May 2009, 6:31 pm

Well at last we're getting somewhere.

Meter faulty on 20mA range. Not good for measuring current consumption.

R27 51 ohms off value at 80 ohms. Replaced with 47 ohms.

R28 270 ohms off value at 370 ohms. Doesn't matter much.

R30 measures 122.6 ohms. Can't pronounce judgemnet on this as don't know the correct value. Need to know its colour code.

T2 primary open circuit one half. This is a symptom of excess current through the transformer, but not the cause of it.

You need to source a new transformer, rewind it or get it rewound.

In the mean time I'll leave you to try out geofy's suggestion.

9th May 2009, 6:31 pm	#142
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,288	Re: Roberts RT7 - problem Well at last we're getting somewhere. Meter faulty on 20mA range. Not good for measuring current consumption. R27 51 ohms off value at 80 ohms. Replaced with 47 ohms. R28 270 ohms off value at 370 ohms. Doesn't matter much. R30 measures 122.6 ohms. Can't pronounce judgemnet on this as don't know the correct value. Need to know its colour code. T2 primary open circuit one half. This is a symptom of excess current through the transformer, but not the cause of it. You need to source a new transformer, rewind it or get it rewound. In the mean time I'll leave you to try out geofy's suggestion. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.