Circuits & Concepts

Your "0" on the tuner problem is the trim cap for the PLL. I have those on my ebay store, or you can send me a DM. Les

Yep. When the trim capacitor oxidizes, it can go open. That makes the PLL IC lose its mind. Time for a fresh trim cap! Les

Welcome, Matt! I suggest you get the power supply sorted out before doing anything else. I typically probe the rectifier diodes to do this. Red meter lead on the diode of interest and the black lead on the chassis. Measure and log both the DC and AC voltages. The AC voltage (on the rectified side of the diode) should be lower than 0.1 VAC. Something higher indicates a bad power supply capacitor, which will mess up the regulation. The kit you ordered from C & C includes the resistor R635, new speaker relays and a trim cap for the tuner. The high efficiency regulator I make replaces the 4 hot resistors on the main/amp board, and includes replacements for the 4 hot resistors on the noise reduction board. You shouldn't do that upgrade until the rest of the receiver is fully functional. Hope it goes well! Les

Welcome to the site, Brian! Hearing from Tooele takes me way back... years ago I worked at the Hercules rocket plant in WVC. Cheers! Les

Hello, and welcome to the site! You said that you measured the supply voltages per the photo I posted in the other thread. Could you share both the DC and AC measurements? These measurements are taken at the rectifier diodes because they are the most convenient point at which to probe. Thanks! Les

Thanks to Steve for stepping into the job. Thanks also to Snow for all the work you did!!! Cheers! Les

They're Advent Prodigy Towers. I'm not the original owner--purchased them at an estate sale years ago. I estimate they were made in the late 1980's. Les

Thanks for your help with this Kev! And, Happy Birthday!! !!! Les

I experimented with using coil movement to center the coil, but I went with cutting the dust cover 7/8 of the way around and shimming the coil. I used 24 lb paper strips for the shims. Using Kevin's recommended 3M Plastic and Emblem Adhesive, which cures very quickly, everything is done! All that remains is to screw the drivers in and clean up the glue on the dust caps. I'll let the speakers set with the cones pointed up as long as my patience will allow (maybe until this evening), then see how they sound. Thanks to all for your advice! Cheers! Les

I started re-foaming my Advent speakers over the Holiday break with assistance of my daughter, Emily. I enlisted her assistance, as she is listens to them most regularly. We got the baskets and cones cleaned off. The next step in the directions says REMOVE THE DUST CAPS. I understand that aligning the voice coil is very important. My question for Kevin (or anyone else who wants to chime in) is whether the voice coil can be aligned without hacking into the dust cap. Thanks in advance for your help! Les