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The Tandberg TR-2055 is a highly regarded vintage FM stereo receiver manufactured in Norway in the 1970s. For a long time I had neglected an issue with the left channel where it would lose volume. If I turned it up loud the volume would return, but would not last. Tandberg: A legendary Norwegian audio giant that conquered the global hifi market with uncompromising engineering, while pioneering revolutionary worker rights decades ahead of its time, and using beautiful Scandinavian designs and materials. https://images.squarespace-cdn.com/content/v1/693185d87a6eb535966e2c57/bed6bdd3-7b3c-4733-96c1-0c3a68fc2c5d/Relay_Pinouts.jpg Blog - Tandberg Speaker Protection Relay - This is a classic issue pointing to the speaker protection relay. In this unit the relay was made in the UK by PYE who are long since gone. The pinout pattern is nonstandard today, and the footprint is much different to modern relays The first attempt was to clean the relay contacts, but popping when powering off the amp was still noticed which suggested relay contacts still pitted, or even the tension in the armature that moves the contacts. Popping is not a good thing and will damaged speakers. It could also have been output capacitors, but first deal with one problem before inventing another. Adding the part number of the original relay here for when the next person who needs help goes searching. S.603398 and it is 24v with a 1K coil, so 0.2a. https://images.squarespace-cdn.com/content/v1/693185d87a6eb535966e2c57/9196ce5d-0b0f-435a-a348-3825b0c4367c/Internals+of+TR-2055 Blog - Tandberg Speaker Protection Relay - Now, as this was my own equipment I failed to take lots of photos of how I fixed it! Here we see the internals exposed, and we are interested in the main amplifier board in-between those big capacitors. https://images.squarespace-cdn.com/content/v1/693185d87a6eb535966e2c57/19a8e813-4030-4444-857e-79a92909beef/Relay_Location Blog - Tandberg Speaker Protection Relay - In my unit’s year, and they do vary a little, the board location is K801, and that’s the white rectangle you see in the middle of this photo after I had removed the relay. Yes, I know, a before photo would have been useful! https://images.squarespace-cdn.com/content/v1/693185d87a6eb535966e2c57/30c30d84-2371-4f38-9be3-6e14312d2adc/Replacement_Relay Blog - Tandberg Speaker Protection Relay - I found a compatible good quality relay from Panasonic but many people obsess over OMRON, but when you look at everything else, a good quality relay of any type will work just fine. I used a Panasonic JW2SN-DC24V AJW7212, 24VDC Coil 8-Pin DPDT relay. Note: The Tandberg is a SPST NO relay, so the extra contacts are just ignored. https://images.squarespace-cdn.com/content/v1/693185d87a6eb535966e2c57/bb16688d-8e03-4572-8f7e-6544dfab131d/Daughterboard1 Blog - Tandberg Speaker Protection Relay - As there was no way I was going to find a relay to fit where the old one came out I decided to make a little piggyback or daughterboard out of some spare project or Vero board. The amplifier main board had a convenient hole right below where you see the little black screw. I used some plastic standoffs to make a mount and attached the board to it as you can see. The relay was soldered to the board and wires added for each needed contact. https://images.squarespace-cdn.com/content/v1/693185d87a6eb535966e2c57/b8bef2b6-0b64-470c-9c99-9ead7a484e33/Daughterboard2 Blog - Tandberg Speaker Protection Relay - A slightly different angle here so you can see how the wires are simply soldered into the relay holes on the main amplifier board. I used solid core wires as this is far better, and easier, than trying to use stranded wire. I did write down all the pinouts and test with a multimeter before I chose colors and committed to the final fit. Anyway, this solved the problem and both channels work perfectly and no popping when turning off. No need to recap anything. https://images.squarespace-cdn.com/content/v1/693185d87a6eb535966e2c57/1783449369178-HQXN7QJL1O5IPDSXRDGV/Tandberg+TR-2055+Receiver Blog - Tandberg Speaker Protection Relay - One little extra was fitting a new 24v bulb as the stereo indicator had never worked. I probably forgot it even had one! The Tandberg TR-2055 features the exact same high-performance FM tuner section as the flagship TR-2075 which is considered world class as an FM receiver. Power Output: 55 watts per channel into 8 ohms, capable of handling 4 - 16 ohm speaker loads. Build: Solid aluminum body with rich wood side panels and top. 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