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

Station X · 29th Apr 2009, 10:52 am

This repair seems to be going nowhere. We have a radio which doesn't work, pulls down the battery voltage and gets hot. All this suggests that the radio is drawing too much current.

I would suggest:-

Investigating the break in the track. If it is indeed a break then bridge it with a piece of flexible wire.

Reconnect the speaker.

Measure the actual current drawn by the set. Meter set to mA range and connected in series with the battery. One lead to battery positive and the other to the red lead of the set which should be disconnected from the battery.

Measure the voltages on all the leads of TR4, 5, 6 and 7. Red lead of meter to chassis. Black lead of meter to the point being tested.

Post the results here for analysis.

29th Apr 2009, 10:52 am	#62
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,288	Re: Roberts RT7 - problem This repair seems to be going nowhere. We have a radio which doesn't work, pulls down the battery voltage and gets hot. All this suggests that the radio is drawing too much current. I would suggest:- Investigating the break in the track. If it is indeed a break then bridge it with a piece of flexible wire. Reconnect the speaker. Measure the actual current drawn by the set. Meter set to mA range and connected in series with the battery. One lead to battery positive and the other to the red lead of the set which should be disconnected from the battery. Measure the voltages on all the leads of TR4, 5, 6 and 7. Red lead of meter to chassis. Black lead of meter to the point being tested. Post the results here for analysis. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.