Mosrite Model 450 Bass Head Restoration

Mr. Bill
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Re: Mosrite Model 450 Bass Head Restoration

Postby Mr. Bill » Tue Mar 21, 2017 9:25 am

As you already know, take tons of well lit photos before disassembly detailing what connects to what, so that you have a reference to how to put it all back together.

There are two major sections to this restoration, one is purely mechanical and the second is all electronic. To do this right, you will need to tear this down to the sub-assembly level by removing all of the electronics from the chassis and then cleaning, refurbishing, rebuilding, refinishing, etc. all of the parts and then reassembling back into an amp.

The photos show damage from the fire itself and damage from the water used to put out the fire. As far as the electronics go, you have to hope that the chassis was left to completely dry out before it was plugged in and turned on. If it wasn't, then there could be all sorts of damaged done from the wet circuits being powered up. Water makes a really good conductor.

Unfortunately a lot of the electronics repairs can only be done after all of the sections are connected together back inside the chassis. Be certain to change the ac power cord to a 3-wire grounded cord and remove the ground switch capacitor.

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Sarah93003
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Re: Mosrite Model 450 Bass Head Restoration

Postby Sarah93003 » Tue Mar 21, 2017 1:02 pm

Mr. Bill wrote:As you already know, take tons of well lit photos before disassembly detailing what connects to what, so that you have a reference to how to put it all back together.

There are two major sections to this restoration, one is purely mechanical and the second is all electronic. To do this right, you will need to tear this down to the sub-assembly level by removing all of the electronics from the chassis and then cleaning, refurbishing, rebuilding, refinishing, etc. all of the parts and then reassembling back into an amp.

The photos show damage from the fire itself and damage from the water used to put out the fire. As far as the electronics go, you have to hope that the chassis was left to completely dry out before it was plugged in and turned on. If it wasn't, then there could be all sorts of damaged done from the wet circuits being powered up. Water makes a really good conductor.

Unfortunately a lot of the electronics repairs can only be done after all of the sections are connected together back inside the chassis. Be certain to change the ac power cord to a 3-wire grounded cord and remove the ground switch capacitor.



Thank you for the tips!!
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1965 Mosrite Celebrity Prototype with Vibramute
1972 Mosrite Celebrity-III
1977 Gibson MK-53
1982 Fender Bullet
1994 Gretsch Streamliner G3155 Custom
2005 Gibson Les Paul Standard Plus
2006 Jude Les Paul 12 String

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Sarah93003
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Re: Mosrite Model 450 Bass Head Restoration

Postby Sarah93003 » Wed Mar 29, 2017 10:50 pm

The amp arrived yesterday. I unpacked it today and did a quick once over. It actually appears to be in better condition than the photos suggested. It seems that any flames were just in the front. None of the wood is charred, none of the plastic parts are melted. Any steel parts are rusted and I am guessing that is from water. I'm going to check out the two transformer first to see if they are functional and then begin assessing everything else.

From what I have read Ed Sanner designed these amps for Mosrite Electronics. I wonder if he has any schematics for them. Any ideas?
____________________
1965 Mosrite Celebrity Prototype with Vibramute
1972 Mosrite Celebrity-III
1977 Gibson MK-53
1982 Fender Bullet
1994 Gretsch Streamliner G3155 Custom
2005 Gibson Les Paul Standard Plus
2006 Jude Les Paul 12 String

Bob Shade
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Re: Mosrite Model 450 Bass Head Restoration

Postby Bob Shade » Thu Mar 30, 2017 5:23 am

I will ask Ed if he has the schematic. He very well may.

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Sarah93003
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Re: Mosrite Model 450 Bass Head Restoration

Postby Sarah93003 » Thu Mar 30, 2017 7:01 am

Thank you Bob. That would be awesome. If he has any of the amp schematics it would be great if we could archive them.
____________________
1965 Mosrite Celebrity Prototype with Vibramute
1972 Mosrite Celebrity-III
1977 Gibson MK-53
1982 Fender Bullet
1994 Gretsch Streamliner G3155 Custom
2005 Gibson Les Paul Standard Plus
2006 Jude Les Paul 12 String

T_mart
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Re: Mosrite Model 450 Bass Head Restoration

Postby T_mart » Sun May 27, 2018 12:57 pm

Sarah93003 wrote:Thank you Bob. That would be awesome. If he has any of the amp schematics it would be great if we could archive them.



Hi, does anyone know if this schematic ever surfaced?

I also have a 450, and the rectifier diodes are smoking when i turn it on. It has blown 1 fuse.

Thankyou! glad to be part of the forum!
Tmart

Mosrite 350 Bass
Mosrite 350 Stereo Guitar
Mosrite Celebrity I Guitar
Mosrite Celebrity III 12 String
Mosrite Dobro
Mosrite 450 Amplifier

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Sarah93003
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Re: Mosrite Model 450 Bass Head Restoration

Postby Sarah93003 » Sun May 27, 2018 7:46 pm

According to Ed Sanner there are no schematics available for these. I would love to see photos of the inside of your head as mine is pretty rough shape. You can reach me directly at: Sarah@MosriteCelebrity.com
____________________
1965 Mosrite Celebrity Prototype with Vibramute
1972 Mosrite Celebrity-III
1977 Gibson MK-53
1982 Fender Bullet
1994 Gretsch Streamliner G3155 Custom
2005 Gibson Les Paul Standard Plus
2006 Jude Les Paul 12 String


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