service bulletin

Howdy all, I just picked up a minty Sansui 3000a and despite a small amount of scratchiness on the controls everything seems to be functioning really well. Very impressed with the FM reception! I believe this has had the service bulletin update and I'm going to put a couple pictures here to see...

Anybody have more of the KLH Service Bulletins other than the 2 out of 3 pages of #59 and the Butyl Sealing Commandments of #60? That's all I've found in the wild. The missing page 2 of #59 seems like it might have some good stuff as there are a number of woofers missing from the 2 existing...

I am not a technician and need advice on getting upgrades done on two CR-2020s. See “Background” below regarding the our two CR-2020s. Anything will be greatly appreciated. Thank you. A couple of days ago I dug out our two CR-2020 receivers to look further into the speaker protection relay...

Complete noob here so excuse my ignorance if this is obvious to others. I had initially posted this here the "Exclusively Sansui" section, but perhaps this forum is a better fit. I've replaced the faulty transisters in my 2000a and it got rid of the popcorn static. It still has a slight hum or...

First-time poster so please bear with me on the learning curve here. I have a Yamaha Cr-1020 I picked up a while back and love the sound. While playing it over 30mins. it would pop then lose the sound. No movement on the needles for power output. So I found this gem of a forum and learned about...

I was recently working on a Marantz 2270 that is very late production, from October 4th, 1975. Serial number is #U462378. We all know there were a few service bulletins issued on this model but I've never seen pics of the mods. First up is service bulletin one which changes the temperature...