sunvalleylaw
Addicted Member
I have quite a few Harman Kardon receivers now. We had a HK 570i as a kid, and not quite 10 years ago when I got into vintage audio, I picked up one of those, then added a few more, the oldest and nicest at the time, a 630 Twin. Saw this and needed to replace one of my newer ones until I can fix it, and grabbed it. The first pic was the eBay picture. The rest are from today. I just opened it up, looked for any visibly bad capacitors or components, powered it on to see if it would (It did) and then after twisting the knobs and finding them extremely stiff, further opened it up and carefully applied De-oxit 5, then Faderlube F5. The knobs are turn way better now. Bass and treble are still a little stiff as compared to balance and volume. Will see if I can find, or have 3d printed, a replacement cap for the end of the volume knob. Getting ready to put it back together and see if it plays well, and am thinking I may leave the metal case off and store that, to allow for more air. My 630 Twin dues not have a metal case under the wood case, and it seems like it might be nice to let it breathe more. Interestingly, there was some blue tinted protective tape on the right front edge of the receiver where the case hits the face plate, not visible until after I removed the wood case. Anyhow, it LOOKS very clean in there, and seems to LOOK in order so hoping it will just play when I put it all back together to provide office tunes in my home office in an extra bedroom. We'll see! 








I will have streaming, a turntable, and a CD player hooked up.









I will have streaming, a turntable, and a CD player hooked up.


