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 Post subject: temp setting for interstage tar dump?
PostPosted: Feb Fri 20, 2004 3:27 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 48
Location: Midwest
hi,<P>getting ready to heat up my audio interstage transformer cans on a hot plate to dump the tar. What is a good temperature setting and how long will it generally take to melt the tar? Any risk of personal injury here?! I'll be sure not to leave them unattended!<P>Timnic<P>------------------<BR>Married to a card holding member of WAPSBINO; Wives Against Power Supply Baking In New Oven!


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 Post subject: temp setting for interstage tar dump?
PostPosted: Feb Fri 20, 2004 3:49 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1586
Location: ayer ,ma usa
I vote for a heat gun; how will you do it on a hot plate? Heat gun will let you heat the outer shell, and guts drop out. On hot plate, whole inside will melt before top gets hot...some of this stuff seems to need to get really hot 300+??. If on a hot plate and upside down, and very patient, near an open window, maybe ..then you need good tongs, maybe with a bungee cord wrap to hold em shut, to grab them and tip over into the disposal bag and can you had ready!<P>------------------<BR>


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 Post subject: temp setting for interstage tar dump?
PostPosted: Feb Fri 20, 2004 6:58 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 30698
Location: Pocasset, Cape Cod, MA
Heat gun. Torch will work too but you absolutely must do that outdoors.<P>Are you intending to save and re-use the insides? It's going to be very difficult to melt chokes or transfomers out without overheating them. Maybe impossible. When they were potted originally, the tar was hot but the transformer didn't get up to that temperature.<P>------------------<BR>


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 Post subject: temp setting for interstage tar dump?
PostPosted: Feb Sat 21, 2004 1:35 am 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 528
Location: Cambridge, Ontario Canada
I have found that putting them in a can of water and setting it to boil also works well. Very little fumes come of it. less risk of fire and the tar or wax rises to the top of the water Moe<P>------------------<BR>Moe


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 Post subject: temp setting for interstage tar dump?
PostPosted: Feb Sat 21, 2004 6:38 am 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 7395
Location: Bossier City, Louisiana
I have baked them in the oven. Not real keen of this process for smaller cans. I prefer to place in a boiling water. If it is a small can. Which it sounds like you have. Place in a coffee can suspended with a coat hanger support bracket. I bend hanger so transformer is suspended just up to top edge in water.<BR>Bring to boil and watch closely. I have found that it takes some time so please be patient. Plus since you are heating slowly it allows all tar to become "melted". Plus I have found that this releases fewer fumes. I have had good luck with this and in fact had repaired an open IF transformer completely immersed in this d--- tar some time back.<P>Good luck and keep us posted.<P>Dave<P>------------------<BR>


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 Post subject: temp setting for interstage tar dump?
PostPosted: Feb Sat 21, 2004 7:45 am 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 48
Location: Midwest
Thanks for the ideas. I think I'll try the boiling technique. Less fumes does sound like the better way at our house. On a separate note, I borrowed a basic electronics text book from the tech teacher at the school where I teach today. Now I can start learning how to read schematics and can look up all these terms I don't have a handle on. Since I teach music, I wondered out loud to my student teacher today whether there are elcetronics wizards out there that have struggled with the meaning of music terms like I've been struggling with electronics terms?! Still trying to figure out "Audio Interstage Transformers" and the like...back to the book!<P>Timnic<P>------------------<BR>Married to a card holding member of WAPSBINO; Wives Against Power Supply Baking In New Ovens!


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 Post subject: temp setting for interstage tar dump?
PostPosted: Feb Sat 21, 2004 9:17 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 11474
Location: Valley City ND USA
Just drop it after it's been on the porch overninght at -30. Sometimes it's not what you know, but where you are. <IMG SRC="http://antiqueradios.com/forums/wink.gif"> <P>------------------<BR>terry h


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 Post subject: temp setting for interstage tar dump?
PostPosted: Feb Sat 21, 2004 7:01 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 7395
Location: Bossier City, Louisiana
Hey Terry<P> I spent about eight years in Minot. From 86-94. I did enjoy ND. I am in Louisianna now. I do enjoy the weather here better!!<P>Dave<P>------------------<BR>


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 Post subject: temp setting for interstage tar dump?
PostPosted: Feb Sun 22, 2004 12:45 am 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 30698
Location: Pocasset, Cape Cod, MA
You may need an older book for the vacuum-tube terminology. Ask around and you can probably pick up some for nothing.<P>Audio: within the frequency range of hearing.<P>Interstage: couples a signal between amplifying stages (one vacuum tube and its associated circuitry).<P>Transformer: takes an AC (audio in this case) signal and transforms it from one voltage level to another.<P>------------------<BR>


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