Phonoland

This happens quite often, as most companies print up service manual schematics pre-production of the unit. Things get changed as production begins, and are found, that will not work, as en-gin-neering had planned. This is sometimes refereed to as "the real world experience" Ron Rich

sunnybeth33 wrote:I just found one of these in the house that my parents bought... Everything seems to be working but the needle... Can someone tell me what type of needle it takes.

The needle that will fit is 754-SS73 or 754-DS77. I'm sure there will be others that fit. These use an Astatic 493 cartridge which can be a little difficult to find.

Matt, how-so? Aside from the oddball method of phase inversion (typical of economy design) i don't see anything technically wrong. At least they loaded the ceramic pickup @ 3.3 Meg - for full bass response. Looks like most of the stuff from that era.

Rob-NYC

Rob-NYC wrote:Matt, how-so? Aside from the oddball method of phase inversion (typical of economy design) i don't see anything technically wrong. At least they loaded the ceramic pickup @ 3.3 Meg - for full bass response. Looks like most of the stuff from that era.

Rob-NYC

Rob,
1)The so-called "bass" control alternate wiring is not drawn properly.
2) The external speaker connector shows a jumper that when connected, will dead-short the entire speaker system.
Not having the original schematic by Magnavox near me, I'd bet some component values are off too.
The Sams schematics are known for mistakes.
As for the phase invertor, it's not really oddball, it's merely a paraphase invertor, used by many manufacturers.

Hello! I have the same Amp chassis, with the same speaker setup that come out of a sentinel record player....Sadly, the record changer has more problems than it (or I, for that matter) know what to do with. So, I decided to keep the amp, which looks like a fantastic little amp, by itself! But please, please, please, can someone tell me how to jump out the phono switch on the plug!! My plug looks different than the one which was posted, as it has a center pin, and I can't for the life of me figure out how they have this wired to turn the Amp on. And I would prefer to just make a jumper plug if possible, and not solder anything in the amp, for originality sake.
Thanks a bunch,

-Alex

Fortheloveoftubes wrote:Hello! I have the same Amp chassis, with the same speaker setup that come out of a sentinel record player....Sadly, the record changer has more problems than it (or I, for that matter) know what to do with. So, I decided to keep the amp, which looks like a fantastic little amp, by itself! But please, please, please, can someone tell me how to jump out the phono switch on the plug!! My plug looks different than the one which was posted, as it has a center pin, and I can't for the life of me figure out how they have this wired to turn the Amp on. And I would prefer to just make a jumper plug if possible, and not solder anything in the amp, for originality sake.
Thanks a bunch,

-Alex

First off, if you have no ability to trace out a shematic/chassis that is so simple, I would advise having someone else with experience do it.
Secondly, it's not much of an amplifier - putting out maybe 3 watts on a good day with fresh tubes.
As for originality, something like this isn't worth fussing over.