Hi I need to building a 4 ohm 1500 watt "cantenna paint can style" dummy
load for audio and guitar amp work. I have forgotten what type of oil to use
for heat transfer.
Id like something easy to get (like peanut or something with a high
flashpoint).
Don't want to loose the house.
Joe "NOSPAM"

In news:7pnrj.1378$J93.474@trndny08 "RP"
wrote:

Hi I need to building a 4 ohm 1500 watt "cantenna paint can style"
dummy load for audio and guitar amp work. I have forgotten what type
of oil to use for heat transfer.
Id like something easy to get (like peanut or something with a high
flashpoint).
Don't want to loose the house.

MFJ sells the correct "transformer oil" by the gallon for $30/gal, but the
manual for their version of the cantenna says you can use "mineral oil".

http://www.mfjenterprises.com/Produc...oductid=MFJ-21

http://www.mfjenterprises.com/man/pdf/MFJ-250X.pdf

--
Bert Hyman St. Paul, MN

"RP" wrote in message
news:7pnrj.1378$J93.474@trndny08...
Hi I need to building a 4 ohm 1500 watt "cantenna paint can style" dummy
load for audio and guitar amp work. I have forgotten what type of oil to
use for heat transfer.
Id like something easy to get (like peanut or something with a high
flashpoint).
Don't want to loose the house.
Joe "NOSPAM"


See E-Ham Article
http://www.eham.net/forums/Elmers/33528

Also a construction article with oil recommendation

http://www.k4eaa.com/dummy.html

Lamont

"RP" wrote in message
news:7pnrj.1378$J93.474@trndny08...
Hi I need to building a 4 ohm 1500 watt "cantenna paint can style" dummy load
for audio and guitar amp work. I have forgotten what type of oil to use for
heat transfer.
Id like something easy to get (like peanut or something with a high
flashpoint).
Don't want to loose the house.
Joe "NOSPAM"


In another life, I worked at a Motorola commercial 2-way radio shop. We used
Heathkit Cantennas for all of our test benches. All were filled with mineral
oil. Ran that way for years, never a problem.

--
Dave M
MasonDG44 at comcast dot net (Just substitute the appropriate characters in the
address)

"In theory, there isn't any difference between theory and practice. In
practice, there is." - Yogi Berra

On Sat, 09 Feb 2008 19:45:07 GMT, "RP"
wrote:

Hi I need to building a 4 ohm 1500 watt "cantenna paint can style" dummy
load for audio and guitar amp work. I have forgotten what type of oil to use
for heat transfer.
Id like something easy to get (like peanut or something with a high
flashpoint).
Don't want to loose the house.
Joe "NOSPAM"

The idea of using a cantenna for audio is new to me.

I would be inclined to use distilled water for continuous use and tap
water if use is intermittent. Cheap & trivial risks!

As I think back of all the lash ups I have used to build and test
power supplies through the years I think you have led me to a much
more practical solution!

John Ferrell W8CCW
"Life is easier if you learn to
plow around the stumps"

Even vegetable oil will do, as this (partly german) website
proves.....:-)
http://www.markusleonhardt.de/en/oelrechner.html

MRE
PE1NQR



"Jim Higgins" schreef in bericht
...
On Sat, 09 Feb 2008 19:45:07 GMT, "RP"

wrote:

Hi I need to building a 4 ohm 1500 watt "cantenna paint can
style" dummy
load for audio and guitar amp work. I have forgotten what type
of oil to use
for heat transfer.
Id like something easy to get (like peanut or something with a
high
flashpoint).
Don't want to loose the house.
Joe "NOSPAM"


I suggest light mineral oil, unless you can get transformer oil
cheaper. Both are mineral oil, one just a bit more refined,
which is
absolutely unnecessary in your application - or as 50 ohm
amateur
radio dummy loads for that matter.

I only listed the "Transformer Oil" link below for its
reference to
mineral oil. I'm not for a second suggesting any of the fancy
new
alternatives mentioned at that link.

http://en.wikipedia.org/wiki/Mineral_oil
http://en.wikipedia.org/wiki/Transformer_oil

On Feb 9, 1:45*pm, "RP" wrote:
Hi I need to building a 4 ohm 1500 watt "cantenna paint can style" dummy
load for audio and guitar amp work. I have forgotten what type of oil to use
for heat transfer.
Id like something easy to get (like peanut or something with a high
flashpoint).
Don't want to loose the house.
Joe "NOSPAM"

I used 'baby oil' - the local pharmacy had a bunch marked down 80% as
it was close to expiration. It is just scented mineral oil - what
could 'expire' in that? It works fine in my cantenna, and smells
better than anything else in the shack.

73 - NM0S

On 2008-02-09, RP wrote:
Id like something easy to get (like peanut or something with a high
flashpoint).

Use mineral oil. Don't use any kind of food oil -- it will go rancid.

--
Ben Jackson AD7GD

http://www.ben.com/

RP wrote:
Hi I need to building a 4 ohm 1500 watt "cantenna paint can style" dummy
load for audio and guitar amp work. I have forgotten what type of oil to
use
for heat transfer.
Id like something easy to get (like peanut or something with a high
flashpoint).
Don't want to loose the house.
Joe "NOSPAM"

Hi Joe,

I recently revived a Cantenna. When it came time to refill, I considered
mineral oil and decided to go with transfomer oil because of the better
thermal characteristic. Others have suggested that you can buy it from MFJ,
but I found it as close as my local power company. It was no big deal for
them to give me a gallon. ^5

Your audio dummy load sounds interesting. You might consider keeping an eye
on the oil temperature, as my Cantenna gets noticeably warm fairly
quickly... can't drive it at 1KW sinewave for very long. I envision a
thermistor comparator audible indicator.

73,
Bryan WA7PRC

Mineral oil works well. The only problem I had was that the extreme
temperature swings where I live put some condensation in the cantenna
and the bottom eventually rusted out. An old paint can works just as
well but doesn't have the fancy graphics on the outside.

The look on the clerk's face when you check out in the drug store with a
gallon of mineral oil - PRICELESS!

Erich, N6FD

Jim Higgins wrote:
On Sat, 09 Feb 2008 19:45:07 GMT, "RP"
wrote:

Hi I need to building a 4 ohm 1500 watt "cantenna paint can style" dummy
load for audio and guitar amp work. I have forgotten what type of oil to use
for heat transfer.
Id like something easy to get (like peanut or something with a high
flashpoint).
Don't want to loose the house.
Joe "NOSPAM"


I suggest light mineral oil, unless you can get transformer oil
cheaper. Both are mineral oil, one just a bit more refined, which is
absolutely unnecessary in your application - or as 50 ohm amateur
radio dummy loads for that matter.

I only listed the "Transformer Oil" link below for its reference to
mineral oil. I'm not for a second suggesting any of the fancy new
alternatives mentioned at that link.

http://en.wikipedia.org/wiki/Mineral_oil
http://en.wikipedia.org/wiki/Transformer_oil