Magnavox D8443 Power Blaster Upgrade

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kennerithmcguire

kennerithmcguire

Member (SA)
Here is a link to a preamp board with tone controls etc and input board. You could separate the pots from the original board and run ribbon cable to pots. This would allow you to use the same layout on the front of the casing.

Link for pre-amp - http://www.ebay.ca/itm/111374163512?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Link for input selector - http://www.ebay.ca/itm/251769483569?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

I can't wait to see how you progress!
 
Lasonic TRC-920

Lasonic TRC-920

Moderator
kennerithmcguire said:
What if you were to build the back half of the box out of mdf, In order to get the thickness/depth but used the back half of the case to skin the unit? Very similar to your design but it would allow for better acoustics plus keeping the original look and feel.
Using bondo, or fiberglass to blend the back to the front of the original case...in essence the inner box is made from wood slightly smaller than the actual casing.
Hope this makes sense, I love this kind of Mod!
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I'm looking at the interior volume I will need right now, I'm going to stay away from MDF, even though it will provide a nice thud, I will be using some sort of plastic, plexi or acrylic to keep the weight down to a minimum.
kennerithmcguire said:
Here is a link to a preamp board with tone controls etc and input board. You could separate the pots from the original board and run ribbon cable to pots. This would allow you to use the same layout on the front of the casing.
Link for pre-amp - http://www.ebay.ca/itm/111374163512?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
Link for input selector - http://www.ebay.ca/itm/251769483569?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
I can't wait to see how you progress!
Click to expand...
Thanks for sending these links. I have seen some of these on ebay,. was thinking the same thing. Depending on space, possibly mounting the pots and remote wiring the board somewhere else.
So, here are the speakers....first of all, they are plastic! They are super light, that's cool, but PLASTIC :nonono: :thumbsdown:
20160317_141408.jpg20160317_141411.jpg20160317_141402.jpg
I have shot a video of the full tear down, need to edit it and get it uploaded to YouTube, I will post it shortly..
 
kennerithmcguire

kennerithmcguire

Member (SA)
Lasonic TRC-920 said:
I'm looking at the interior volume I will need right now, I'm going to stay away from MDF, even though it will provide a nice thud, I will be using some sort of plastic, plexi or acrylic to keep the weight down to a minimum.


Thanks for sending these links. I have seen some of these on ebay,. was thinking the same thing. Depending on space, possibly mounting the pots and remote wiring the board somewhere else.

So, here are the speakers....first of all, they are plastic! They are super light, that's cool, but PLASTIC :nonono: :thumbsdown:

attachicon.gif
20160317_141408.jpg
attachicon.gif
20160317_141411.jpg
attachicon.gif
20160317_141402.jpg

I have shot a video of the full tear down, need to edit it and get it uploaded to YouTube, I will post it shortly..
Click to expand...
Wow not even a stamped basket....I haven't had a chance to take mine apart. I can't believe it "plastic" what a joke.
 
Lasonic TRC-920

Lasonic TRC-920

Moderator
Reli said:
The nooks & crannies between those speakers would look SICK in Ford Grabber Blue :rock:

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grabber.jpg
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I doubt I'm going to change the color. I love all the chrome and it's in amazingly good condition, so I think a good bath and go from there. But I do like that blue!

kennerithmcguire said:
Wow not even a stamped basket....I haven't had a chance to take mine apart. I can't believe it "plastic" what a joke.
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Yeah, they really went for every penny here. I won't be reusing any of these speakers, but if anyone has another center speaker, I would like to try two of them in a project just for the hell of it.

trippy1313 said:
Yep... pretty cheap stuff. Looks like they're pretty clean. That's cool.
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The whole radio isn't bad at all. I am editing the tear down video so you all can see where I am going with this.
 
Lasonic TRC-920

Lasonic TRC-920

Moderator
Retro Addict said:
Are you painting the replacement speakers black to look original, Chris? It could be a 'sleeper' then... :rock:
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Have a look at the video...you will see what happened when I tried to put the Lasonic speakers in...

trippy1313 said:
You should post an unedited, unrated version as well, with all the bloopers included.
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Oh, it's all in there :lol: :lol: :lol:
 
kennerithmcguire

kennerithmcguire

Member (SA)
The video is great, love the commentary on the speaker choices Magnavox used! :bang: Why do companies nickel and dime something that could have been a great product?
 
J

jimmyjimmy19702010

Member (SA)
I doubt those Lasonic speakers would have handled the power output of that D class amp anyway. They sure would have looked great in that Philips case though.

You're a patient man Chris. Just looking at the available space for your tweeters made me shudder!!

Keep going dude!

James.... :-)
 
Lasonic TRC-920

Lasonic TRC-920

Moderator
kennerithmcguire said:
The video is great, love the commentary on the speaker choices Magnavox used! :bang: Why do companies nickel and dime something that could have been a great product?
Click to expand...
It's really a shame they didn't do this radio right, Thankfully other manufacturers too this design and ran with it, thinking Aiwa!

jimmyjimmy19702010 said:
I doubt those Lasonic speakers would have handled the power output of that D class amp anyway. They sure would have looked great in that Philips case though.

You're a patient man Chris. Just looking at the available space for your tweeters made me shudder!!

Keep going dude!

James.... :-)
Click to expand...
Oh the tweeter thing is going to be a challenge. Not quite figured that out. I hate tweeters in the center of speakers, like car door tri-axles, but it might be :-/
 
J

jimmyjimmy19702010

Member (SA)
I agree that the dreaded 'tweeter in front of the driver look' will make people think you've now got empty holes in your car door panels! :-)

What are the dimensions of the original tweeter cavities? Maybe a pair of these sweet sounding 25mm (OD) Pioneer 4 ohm soft dome tweeters might fit. These should take up a lot less room with their cylindrical shape than a traditional cone tweeter and they can handle big power (50 real watts RMS per channel) and have an ideal (90 dB) sensitivity. View attachment 26212View attachment 26213View attachment 26214
 
Lasonic TRC-920

Lasonic TRC-920

Moderator
I agree that the dreaded 'tweeter in front of the driver look' will make people think you've now got empty holes in your car door panels! :-)

What are the dimensions of the original tweeter cavities? Maybe a pair of these sweet sounding 25mm (OD) Pioneer 4 ohm soft dome tweeters might fit. These should take up a lot less room with their cylindrical shape than a traditional cone tweeter and they can handle big power (50 real watts RMS per channel) and have an ideal (90 dB) sensitivity. {style_image_url}/attachicon.gif image.jpeg{style_image_url}/attachicon.gif image.jpeg{style_image_url}/attachicon.gif image.jpeg

There is no cavity to put tweeters in. The tweeters you showed will most likely be what I will have to use. I don't really want to go any smaller. I will probably just cut the biggest whole I can without it looking like a hot mess from the front and build something to hold it from the back.
 
Superduper

Superduper

Moderator
Staff member
Chris, looks like that's a 2.1 amp. So perfect for you. 3-channel output. 2@15wpc and 1@30wpc. So you only need one amp.
 
R

ralrein1

Member (SA)
Enjoyed your video on the teardown Chris,also dug the vintage Scorps!Looking forward to more vids.Keep up the good work.👍
 
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