UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Help with Grundig TK27

8 Tracker · 17th May 2020, 8:35 pm

Welcome along. This is a 4-track stereo machine, but it's only got a mono amplifier, so if you want stereo out of it you have to connect it to a suitable amplifier. You don't say if you've tried recording on both tracks. If you haven't give it a try and see if both tracks sound the same.

The track selector switch can give problems. A spray of Deoxit can work well on it.

This recorder is a little different than the rest in the range as the record / playback switches are not on the circuit board and they are quite fiddly to get to. If you remove the bottom cover and drop down the circuit board you can just see them hidden behind a metal box cover at the very right of the machine. Two screws hold the cover on and you can just loosen them to slide the cover off. You can then see the contacts. If you put the track selector switch to 1-2 and press the record button you can see the lever operate the contacts. Same for track switch position 3-4 except it operates the other set of contacts. These are the ones that are difficult to get to as they are against the side of the machine. You can try cleaning the contacts that are easiest to get to and see if that brings results first. If it does, then you can think about removing the contacts to get to the other side. If you get this far, you need to be careful as the wires to the contacts are not very long and don't allow much room for movement.

Hope you can follow all this and that it helps. Let us know how you get on,
Mark.

17th May 2020, 8:35 pm	#2
8 Tracker Hexode Join Date: Jul 2009 Location: Mablethorpe, Lincolnshire, UK. Posts: 286	Re: Help with Grundig TK27 - Recording Welcome along. This is a 4-track stereo machine, but it's only got a mono amplifier, so if you want stereo out of it you have to connect it to a suitable amplifier. You don't say if you've tried recording on both tracks. If you haven't give it a try and see if both tracks sound the same. The track selector switch can give problems. A spray of Deoxit can work well on it. This recorder is a little different than the rest in the range as the record / playback switches are not on the circuit board and they are quite fiddly to get to. If you remove the bottom cover and drop down the circuit board you can just see them hidden behind a metal box cover at the very right of the machine. Two screws hold the cover on and you can just loosen them to slide the cover off. You can then see the contacts. If you put the track selector switch to 1-2 and press the record button you can see the lever operate the contacts. Same for track switch position 3-4 except it operates the other set of contacts. These are the ones that are difficult to get to as they are against the side of the machine. You can try cleaning the contacts that are easiest to get to and see if that brings results first. If it does, then you can think about removing the contacts to get to the other side. If you get this far, you need to be careful as the wires to the contacts are not very long and don't allow much room for movement. Hope you can follow all this and that it helps. Let us know how you get on, Mark.