Re: Re[2]: Amplifone rebuild kit

From: Andre Huijts <andre.huijts_at_wanadoo.nl>
Date: Sat Aug 11 2007 - 06:28:25 EDT

Sure, on lot's of place, here's the link that I found in the Cinelabs
HVT manual:

http://ionpool.net/arcade/tech/ampfaq_12.pdf

(The link is also in my SW thread on forum.arcadecontrols.com)

Op 11-aug-2007, om 11:17 heeft Brent het volgende geschreven:

> Is the Ampifone FAQ online somewhere?
>
>
> ----- Original Message -----
> From: Andre Huijts
> To: vectorlist@vectorlist.org
> Sent: Saturday, August 11, 2007 1:17 AM
> Subject: Re: VECTOR: Re[2]: VECTOR: Amplifone rebuild kit
>
> Mmmm, I actualy think the mica and silicone is a better and longer
> lasting cooling option then thermal pads.
> The Amplifone FAQ already suggest to replace the rubber thermal
> pads used with mica and thermal grease on the existing power
> regulators and transistors, because the rubber can deteriorate.
> Also the pads have a worse heat conduction compared to the mica/
> grease.
>
> Even so, I have to say that both the rubber pads and the mica/
> grease on my Amplifone PCB's look to be fine still.
>
> I have no problems replacing parts on the PCB's, even if it's just
> a precaution and I did so on the HV PCB, but I don't see a point in
> blindly replacing all kind of parts that are still fine and are not
> subject to deterioration. I want to know that there is a reason
> for replacing parts on a good working PCB.
>
> Another thing along that line: The amplifone FAQ suggest to add a
> fan near the HV board. Now, I've checked the temperatures of the
> various parts after it run for about half an hour. The only things
> that get really warm are R20 and R21 (the 5W, 50 Ohms resistors).
> The Cinelabs HVT keeps very cool. The BU406D keeps amazingly cool
> as well.
> The 7824 and 7924 seem to be loaded pretty much, but then they have
> the largest cooling body I've ever seen for these kind of power
> regulators. I am thinking of replacing the wire-wound ceramic 5W
> resistor I use now with aluminum 10W types that can be mounted on a
> cooling body. I'd mount them to the 7824/7924 cooling body so they
> can dissipate the heat much better.
>
> Then, I think, there would be no need for forced cooling.
>
> The thing that really gets hot is the deflection PCB ! I think
> cooling that with a fan would make much more sense...
>
>
>
>
> Op 11-aug-2007, om 3:57 heeft peter jones het volgende geschreven:
>
>>
>> -----Original Message-----
>> From: "MyPearl" <mypearl@dds.nl>
>> To: <vectorlist@vectorlist.org>
>> Date: Fri, 10 Aug 2007 17:30:44 +0200
>> Subject: Re: VECTOR: Amplifone rebuild kit
>>
>>>
>>> I never did fot the same obvius reason.
>>>
>>> I also don't replace any transistors. They fail because of wrong
>>> use or
>>> other bad components such as caps.
>>>
>>
>> yes,
>> but it's always good to remove them for a clean and put them back
>> with thermal pads instead of mica washers & silicone mess(grease).
>>
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>
> André Huijts
> andre.huijts@wanadoo.nl
>
>
>
>
>
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> 8/10/2007 3:50 PM

André Huijts
andre.huijts@wanadoo.nl

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Received on Sat Aug 11 06:28:29 2007

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