Dave, Please, folks, don't just turn on a piece of vacuum tube equipment. That could burn out an irreplaceable power transformer. If you do not have equipment to test for shorts or bad electrolytics, then make a jig with a light bulb socket to put the bulb in series with the line. Start with a 40 watt bulb (CFLs won't work) and work up. If the bulb is always bright, don't apply line power to the set.
I sold my LA-800 last spring. Don't remember what paper went with it, but I had the schematic at one time. Sadly, my "filing" system does not make it possible to retrieve anything without going through all of the paper collected over 25 years. Try Manuals Plus. The standard input on the left of the panel feeds selected multipliers that produce 10 MHz. This is fed to a phase shift network such that the scope produces a circular sweep at 10 Mc (circles per second). Sounds like the horizontal scope amp is dead, if you supplied a local standard signal and the multipliers worked. The 90 deg phase shift only produces a circle at 10 MHz. The WWV section on the right side only receives 5 or 15 MHz. Some magic is used to get 10 MHz out of either carrier. This is used to intensity (Z input) modulate the circle. Dunno why they don't receive 10 MHz. Several years ago, here in MN, I had an HP-103 as the standard and was listening on 5 MHz. Propagation was such that WWV would alternate with the female voice at WWVH. The bright half of the circle would change sides, illustrating the phase shift with distance. Neat stuff. I'm willing to help you get this fine receiver back in action. Nice workbench. Bill Hawkins [email protected] -----Original Message----- From: Dave Sent: Sunday, December 20, 2009 4:03 PM Hi Timenuts, My first email to the list. I've had this LAVOIE LA-800D (see picture) receiver for about 10 years now. Before that, it was sitting in an ariplane hanger for some unknown number of years and was headed for the trash when I aquired it. Well, I finally put it on the work bench and was quite surprised that I was able to power it up without anything exploding. I've determined that it will receive WWV on 5mc quite well and produce a vertical deflection on the scope. I can hear a very weak 400hz on the speaker. I can also feed 400 kc into the local standard input and see it getting filtered and amplified internally. This is a far as I can get. I am not sure how this device is suppose to work but am fairly certain that most of it is functional. I really need to find schematics and some operating instructions to make it work all the way. I've already done the quick google and other customary searches for info without avail. If anyone out there could email me pdf's of the schematics, and other manuals it would help me a lot in getting this classic piece of equipment back in operation. Pointers to info would also be appreciated. Thanks, Dave _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
