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Magnovox Phono Console

All good advice... I'd still recommend replacing the PS caps before using powering up with the new tubes, you already ordered em, correct?
Glad you didn't quit, that little amp will amaze you when its right, and the experience is priceless!!...

Regards,
John
 
After/if/when I get this going and I want to put the volume/bass/treble back, would you change anything to make the bass pot actually work ? I notice volume and treble have stacked pots but the bass doesn't ? Any other changes you would make ? The balance I'm not messing with as I never touch that.
 
I found a full size gif of the complete 8301 schematic, any ideas how I can get it loaded here ? The forum keeps telling me "8301schematic.gif: This JPEG image has the incorrect file extension" ? I'm not loading a jpeg ???? it is a 288kb gif.
 
try changing the extension to jpg. Sounds like its actually a jpeg that someone named as a gif. Either that or its what the forum software things it is anyway.
 
knockbill said:
Maybe it can, if the proper resistance is added, to take the place of the cartridge ??

Regards,
John
Click to expand...

Unless you've got a source with an output impedance of a few meg, I don't expect that will do it. Most ceramics work into a few megohm impedance. A typical CD player or whatever is probably well under 100k. Maybe lots of series resistance would get it back, but its probably not going to sound amazing. This is probably a tone control circuit I'd just ditch or replace with a circuit out of the RCA manual or similar.
 
I don't know what's going on with the gif file, I already tried changing the extension and picture doesn't come up clear.

Do I have enough space to build a decent volume, bass, treble on three pots from scratch and fit in there ???
 
It was a jpeg labeled as a gif ! I got it loaded, but it still took the resolution down.
 

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gadget73 said:
Unless you've got a source with an output impedance of a few meg, I don't expect that will do it. Most ceramics work into a few megohm impedance. A typical CD player or whatever is probably well under 100k. Maybe lots of series resistance would get it back, but its probably not going to sound amazing. This is probably a tone control circuit I'd just ditch or replace with a circuit out of the RCA manual or similar.
Click to expand...


That"s the best idea,the tone controls are already out of his chassis...
I left the tone stack in my RCA,,, There is 3.3M at the input end of teh 2M bass pot on the RCA, it works well with a CDP, and tape deck, so far... I actually have to turn the bass down...

Regards,
John
 
gadget73 said:
just make sure you get the right two, otherwise it will either do nothing, or be a dead short across the power line :) If you can follow the wiring on the turntable, the two that go to the switch are the ones you need.


Of the various changers used in consoles over the years, this is by far not the worst. Mod it for a magnetic cartridge and you might be surprised at it. The Collaro changers were right decent pieces, and they have this really cool record sizing process that uses the tonearm.
Click to expand...

That's what I did to my magnavox turntable. In put an audio technica cartridge on it and use a radio shack phono/ pre. Connected into the aux. actually the phono pre is connected to an EQ to balance out the sound.
 
knockbill said:
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That"s the best idea,the tone controls are already out of his chassis...
I left the tone stack in my RCA,,, There is 3.3M at the input end of teh 2M bass pot on the RCA, it works well with a CDP, and tape deck, so far... I actually have to turn the bass down...

Regards,
John
Click to expand...

Could I put this together for this amp ? Is there a schematic of the controls ?
 
Sure, however there is a PEC, off the loudness control, you would have to build it with components shown, and the loudness control may be tough to match, as its got a couple extra taps...
As was previously said, there are tone control designs in teh back of the RCA tube manuals, which may be easier to copy... Here's the thread,, schem on post 16
http://www.audiokarma.org/forums/showthread.php?t=616205&page=2

Regards,
John
 
Could I just use the loudness pot I have before or after the bass treble from that setup ? Am I trying to make this to easier than it actually is. I mechanically minded, so I see things that way. I see from c211 to before pin5 is the one side ?
 
Just wunderin' but are you sure you want to redo the preamp controls? I only ask since you had already stripped the controls and basically made this a power amplifier only.

Maybe leave it as a power amp and build a separate preamp, or........use an existing external preamp and have a 2 piece beginner system.

Lots of preamp options including what you can find on that auction site.
 
I was hoping to keep it as an integrated, but maybe improve on the existing preamp set up.

Got the caps in the mail. This is ridiculous trying to deal with all these bare wires, fit it in and pray nothing touches anything else, including the chassis. If I had to do this again some kind of tubing on those resistors and caps would have been used.
 
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