What is this Magnavox?
- Thread starter jonohull
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zarek
Active Member
That is a S31 powered speaker that could be mated to a matching Magnavox console. For full information on it visit and join www.vintagehifi.net. The amplifier in it is a variant of the Magnavox AMP-150. It's a challenge to use with non matched equipment as its a mono bi-amp unit. It is a high quality unit. Pat
I ran a re-built one of those on a pair JBL bass horns and 511Bs with 902s. Sounded incredible.
Yeppers. 25-30 watts of tube goodness. I'm running a pair of 'em from a 24/96 Audiopile sound card into a pair of JBL L80t3s for my 'puter sound.
BTW OP, you're missing two 6V6GTs right behind that metal box that houses the crossover(front left). The two empty octal sockets on the left and you're also missing the two 5U4GB rectifier tubes on the right side of the chassis. You'll need these tubes to run it.
wa2ise
Super Member
Looks like someone disconnected the amp from the speakers, and used a bunch of 4 conductor cable (looks like TV rotor cable) to drive the speakers. You'll need to figure out how to connect the speakers so they are in phase. The attached Magnavox ocumentation may help. Hopefully, that someone left the speaker plugs plugged into the amp.
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jaymanaa
RIP 1961-2018
I found that single ended 6AQ5s made sweeter highs than 6V6s so I made some adapters. The bass was fine though. The cool thing is you have gain pots for the different frequencies. I don't know if the frequencies themselves are adjustable as I never removed that Al cover, but I'd bet it's passive components so no.
markshan
Sir Thrift a Lot
Yeppers. 25-30 watts of tube goodness. I'm running a pair of 'em from a 24/96 Audiopile sound card into a pair of JBL L80t3s for my 'puter sound.
That is the coolest computer speaker set up ever. What is the card?
Thanks Mark, it's a M-Audio 24/96.
jeffs01879
Active Member
The four conductor cable is the correct cable for the S-31. It should terminate in a 4-pin plug, configured like the base of a standard 4-pin tube. If the S-31 is used as an extension speaker, it plugs into the 4-pin socket on the back of the source amplifier. You can see the 4-pin socket on the back of the amplifier in the photos. If the S-31 is used as a second channel for a stereo system, it plugs into the stereo preamp in the main unit.
I have a mono Model 295 Continental that was factory modified for stereo. It uses an S-31 as the second channel. My Continental has an AMP150 amplifier and an AMP177 preamp for the second channel. My S-31 has an AMP179 amplifier, which appears to be identical to the AMP150. The 4-pin plug connects to a socket on the AMP177.
The 4-pin plug on the back of the amp is shown on the schematic right at the input jack. Two of the four wires are the hot and return for the signal, the other two wires carry 6.3 volt heater power, I don't know what for, as they are not connected at the S-31 unit.
I have a mono Model 295 Continental that was factory modified for stereo. It uses an S-31 as the second channel. My Continental has an AMP150 amplifier and an AMP177 preamp for the second channel. My S-31 has an AMP179 amplifier, which appears to be identical to the AMP150. The 4-pin plug connects to a socket on the AMP177.
The 4-pin plug on the back of the amp is shown on the schematic right at the input jack. Two of the four wires are the hot and return for the signal, the other two wires carry 6.3 volt heater power, I don't know what for, as they are not connected at the S-31 unit.
Someone was selling an AMP-150 here on barter town. Two of these makes you a very nice stereo rig, but you will need speakers that can work in a bi-amp configuration, and they should match up decently to the stock crossover. I think GordonW tested it to be around 1100hz.
I would be interested in that. I need to get a subscription first to get access to bartertown.
Best $25 I ever spent upgrading my system. That's where I found the audiocard that I'm using with my amp150s. There's even a pub in the subscriber's section. Buncha crazies in there Jonohull. :thmbsp:
