12/6/2023 0 Comments Magnavox all transistor schematicand modern Piezo tweeters should work fine. You should use a 16 ohm voice coil speaker or 2- 8 Ohm speakers in series (just get phasing right). Checks, MO or PO are fine and should payable to: Dave and Babylyn Cantelon 6 Ferncrest Gate Scarborough. Cost per schematic is 8.00 US postage ppd. We will let you know if we have schematic. And if you remove it, cut the wires back to their connecting point, don't let them "hang".Īll being said, you have the makings for a nice amp. Easy email us 4 things make, chassis and/or model number, approximate year and country where your old tube radio was made. The extra socket may be for a different application that the amp had. Sometimes the actual circuit ground is floating above or below the chassis, so be mindful of which resistance tab is grounded and what is connected there. If one section burns out, it can be jumpered with a power resistor (usually 5 to 10 Watts) of the same reistance as the burned out section. The "B" resistor in the metal bar is the resistances you should see in the voltage divider resistances you see in the power supply portion of the schematic. You can increase the capacitance too, but normally if the resistance is matched, the resulting RC circuit is as effective at hum reduction as the original LC circuit was. Better to err on the high side as they can get hot. Just make sure the resistor you select is the same resistance as indicated in the schematic and adequate wattage for the amp. ![]() You can ditch the choke as Gadget suggests. ![]() I figure I may save myself some future headaches by just absolving myself of that socket, unless suggested otherwise. Is there something amiss with this chassis as pertaining to that extra socket? Can it, and all of the extra wiring be removed to restore this to its original state (according to the Riders manual, there is no such socket on this amp)? The only thing that would change (other than the simple de-soldered of the extra wiring) would be to run the hot AC line back to its original location directly coupled to the AC outlet on the top of the chassis. The wiring is as such: 6volt leads are running from the lamp output to pins 1 and 2 of the octal socket, pin 3 is grounded to chassis, pin 4 is unused, pin 5 is wired to only one side of the 650ohm power resistor, pin 6 is connected directly to the AC line, pin 7 is connected to the AC output grounded side and pin 8 is unused. Gadget mention above that it may be a power umbilical to a separate component. Now, there is something strange that isn't on the schematic: an extra octal socket between the output transformer and the 6.3 volt lamp connections. I'll snap some photos in a moment and post 'em up. They usually pop up on transformer-less radios that I'm working on. Very basic circuitry with three small can caps and one metal "brick" of what I assume is a cluster of caps, but beyond that it's mostly just tube sockets, filter caps, a few carbon resistors and a whole bunch of other proprietary sockets for, again, what I assume to be connectors for the console's other components.ĭoes anyone with the proper connections to PhotoFact folders know whereabouts I may find a schematic so that I can turn this in to a stand-alone amp without all of the extraneous connections and whatnot? Is it really even worthwhile to bother with it?Īlso, what is that metal bar that's attached to the chassis with four wires running in to it? I've seen them before but I have never bothered to ask about their purpose. The power transformer is about a 6" cube while the output is 4" or so. It weighs about a ton and has one of the largest transformer sets I've ever seen. If models for any manufacturer below are not listed yet contact me for availability.Ĭlick on a manufacturer below to view radio schematics available.Do any of you fine folks have any experiences with this particular amplifier? It's clearly from a console or similar unit, as it's just the amp, no pre-amp circuitry or tubes to be found. I also stock vintage tube amplifier schematics and Photofact service manuals from 1946 through 1963 available via download, and original Photofacts from 1946 through 1970 via US Mail. Schematic downloads (pre 1970s) are available for radios, tape recorders, record players, PA amplifiers, and more from many service sources. I now stock over 500,000 schematics and service manuals. It normally takes up to 24 hours to receive the download instructions via email but please allow 1 - 2 business days. Many of the later (after WWII) models listed below contain additional service information, diagrams, chassis photos, etc. ![]() and Canadian manufacturers and brands listed below are published service data from vintage sources*.Įach schematic is individually digitized in high resolution to provide the clearest possible scan in a downloadable, printable, Adobe PDF file.Įarly model schematics are usually 1 or 2 pages. Radios, Phonographs, Record Changers, Amplifiers, PA, Tube Audio, and more!
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