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 Post subject: Mark III Fan
PostPosted: Fri Jan 12, 2018 3:14 pm 
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Joined: Tue Mar 07, 2017 12:05 pm
Posts: 38
Location: Northern Michigan
Hey guys I just picked up a Mark III Blue stripe head I am totally digging. It’s got a noisy fan and wondered if anyone had a suggestion for a place with s suitable replacement? Your help is appreciated

Mark

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Current Amps:
Mark II C++ HRG
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Mark V:25
& Lots of Cabs!!!!! (all Boogie)


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 Post subject: Re: Mark III Fan
PostPosted: Thu Jan 18, 2018 12:56 pm 
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Mark II
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Joined: Fri Nov 16, 2012 4:55 pm
Posts: 103
Location: East Coast, New Jersey
Howard Industries 3-15-2470 is the original from what I can remember.

Globe Motors a47-b15a-15t1 is in the newer Marks.

I've swapped a noisy Globe Motors in my Mark IV for the Howard Industries which I found on eBay. Direct replacement, no issues. Just be aware of the model number. There are slight variation which seem to denote wattage.

This place sells replacement fans. They usually have a few different choices
http://www.amprepairparts.com/mesaparts.htm#fans

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 Post subject: Re: Mark III Fan
PostPosted: Thu Jan 18, 2018 2:59 pm 
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Joined: Tue Mar 07, 2017 12:05 pm
Posts: 38
Location: Northern Michigan
Thanks, I appreciate the link

_________________
Current Amps:
Mark II C++ HRG
JP-2C
DC-3 Combo
Single Rectifier
Mark V:25
& Lots of Cabs!!!!! (all Boogie)


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 Post subject: Re: Mark III Fan
PostPosted: Sun Jan 28, 2018 7:39 pm 
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Mark I

Joined: Fri Jan 26, 2007 7:10 pm
Posts: 48
Location: JMC Academy, Sydney
I tried a different fan in my IV and IIC+ and didn't really find any difference in noise levels.

The main thing I found is that the noise is really coming from how it's mounted to the cabinet / chassis.
I ended up putting some rubber washers on the bolts / screws to decouple it and it made a huge difference.

Then my tech rewired the grounding switch on the rear to be a fan on/off switch anyway.

You can run the amp with the fan turned off, it's not going to hurt it. Maybe reduce tube life a little.

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 Post subject: Re: Mark III Fan
PostPosted: Mon Jan 29, 2018 3:43 am 
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Mark II

Joined: Fri Jul 28, 2006 5:58 pm
Posts: 104
Location: Europe
What noise is exactly buggin' you - the noise of the fan turning or is there a hum that shouldn't be?

If it is the fan turning maybe a tech could lower the voltage to the fan to make it turn slower. Alternatively, if you are not going to crank the amp on a regular basis the fan could be put on a switch so it can be turned off. Can be handy in a studio environment.

Good luck,
Stephan


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 Post subject: Re: Mark III Fan
PostPosted: Mon Jan 29, 2018 8:09 am 
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Donating Member

Joined: Tue Mar 07, 2017 12:05 pm
Posts: 38
Location: Northern Michigan
The fan was actually hitting the housing and scraping as it went around. I shimmed it up which fixed it up. When it was installed at some point someone over torqued one side distorting the housing. It’s still much louder than the one in my JP-2C but no longer audible when I play at low volume.
Thanks for the help guys,
Mark

_________________
Current Amps:
Mark II C++ HRG
JP-2C
DC-3 Combo
Single Rectifier
Mark V:25
& Lots of Cabs!!!!! (all Boogie)


Top
 Profile  
 
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