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 Post subject: Tube Shields: Easy, Fast & Inexpensive Fix for Motorboating
PostPosted: Aug Thu 28, 2014 10:54 pm 
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Joined: Jun Sun 09, 2013 1:08 pm
Posts: 534
Location: Richmond, VA
I recently needed some tube shields for a set missing all of its tubes and shields. When the tubes were replaced, it motorboated badly. Here is how to make easy tube shields

1. Go to Lowe's or Home Depot and get some Step Aluminum Flashing. Costs about 50 cents apiece. Each piece makes 2 shields.

2. Cut it in half lengthwise down the fold with a pair of kitchen shears. You may have to cut down the height to clear the tube cap.

3. Wrap it around a cylinder the same size as the shield holder. I used a plastic cosmetic bottle like they give you when you stay in a motel.

4. Then roll this onto a piece of duct tape, sticky side up to secure the aluminum.

Works great, and instantly cured the motorboating

Good luck!


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 Post subject: Re: Tube Shields: Easy, Fast & Inexpensive Fix for Motorboat
PostPosted: Aug Fri 29, 2014 5:04 pm 
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Joined: Sep Fri 07, 2007 2:27 am
Posts: 5125
Location: Grand Chute, Wisconsin
I'd be concerned with the smell and possible charring of the duct tape and it's adhesive after prolonged use. Tubes can generate a lot of heat.

I would use metal wrapped around an item of much smaller diameter than the tube it would be used on. That way you'd have a snug fit when stretched over the tube. No adhesive needed.

.


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 Post subject: Re: Tube Shields: Easy, Fast & Inexpensive Fix for Motorboat
PostPosted: Aug Fri 29, 2014 11:27 pm 
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Joined: Jan Thu 24, 2013 4:55 am
Posts: 1243
Location: South New Jersey 08077
jameswross;
Thanks for identifying the cheep, ready source; I usually find myself wandering the aisles thinking "what can I use to ...." and knowing that what I need does not come in a UPC bar-coded package labeled with what I need to do.
So imagine a clerk asks you what you need (that is funny right there) and you say 'I need miniature seven pin, nine pin and octal-GT tube shields'; what department will they direct you to? :(

As far as duct tape, my only concern with that is that will act as a thermal insulator and hold in the heat so the tube runs hot. I might try using a couple of cable ties to hold the shape.

_________________
Ex: Same job, same building, same phone #; 4 Corp's: RCA, GE, Martin, Lockheed-Martin: 48 years


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 Post subject: Re: Tube Shields: Easy, Fast & Inexpensive Fix for Motorboat
PostPosted: Aug Sun 31, 2014 11:01 pm 
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Joined: Jun Sun 16, 2013 6:52 pm
Posts: 337
Location: Cambridge Ontario
I recently needed a tube shield for a 9 pin European converter tube. I had some 3/4 inch copper water pipe tube that fit perfectly onto the shield retainer.. And its thermally conductive.


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 Post subject: Re: Tube Shields: Easy, Fast & Inexpensive Fix for Motorboat
PostPosted: Sep Mon 01, 2014 1:10 pm 
Member

Joined: Jun Sun 09, 2013 1:08 pm
Posts: 534
Location: Richmond, VA
I agree; it would be better to use aluminum HVAC tape which is designed to withstand heat and is thermally conductive.


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