trinityamps.com

For the run from the input jacks to the grid stopper resistors at V1, I want to used shielded wire. I've got some 2-conductor, 24 gauge wire from Radio Shack on hand but am concerned because 22 gauge seems to be the accepted minimum for inside an amp.

I can't find any bigger gauge, 2-conductor shielded wire anywhere except Mouser - and that's in a 100 foot spool. Don't need quite that much. So should I (a) use two separate shielded, single conductor leads, (b) use the 24 gauge that I've already got, or (c) get some 20 or 22 gauge 2-conductor shielded wire at ______________ (please fill in blank)?

Thanks in advance for your help.

Chip

P.S. Please forgive me if you've already seen this on the 18-Watt forum.

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noob de lux

I've been using the George L .155 cable for my input grids. It is the same cable used for wiring effects boards. It's fairly slim, easy to bend, strip and use in the way that us amp builders do!

Here's a link (if that's OK?) to show what to look for. I purchase it locally at a guitar store...
http://www.georgelsstore.com/custom.html


dgately

For shieleded cable, thin is fine. I've used guitar cable, microphone cable and lately, RG174 co-ax cable - thin, easy to work with, nice braided shield.

http://www.rffun.com/catalog/cable/2632.html

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Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

Thanks Stephen!

Chip

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noob de lux

See the info from Belden attached to this post.

Note that for a single conductor and a 35 degree rise over ambient the current carrying capacity of a 22 guage solid wire is 5 A * 1.6 = 8A

For two i.e a single twisted pair of heater wires, the capacity is 5A which is plenty for an 18 Watt amp.

Even if you want to go with a 10 degree rise, the capacity is almost 3A.

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Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

Thanks Stephen!

Looking at that chart, it looks like the 24 gauge would carry 2 amps even with only a 10 degree rise over ambient. I can't imagine the input coming from a guitar getting anywhere close to 2 amps!

Chip

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noob de lux

Use the chart for the other wiring within the amp.



For the input you can try:

Belden
8216 RG174/U 50 ohm
Transmission and Computer Cable
26 awg stranded (7x34) bare copper covered steel center conductor
Tinned copper braid 90% coverage
Black PVC jacket

http://bwccat.belden.com/ecat/pdf/7805R.pdf

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Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

Hi,
Ijust bought some here. Looks good, thought I'd try it out.
http://www.tubetoneamps.com/productpages/wire/wire.htm

Now you're going to have lots 'cause it comes with the kit!

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Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

oh.... I'm sure I can find something around here to do with it. Many capacitors and resistors lying around.

Of course just not yours for the sIII.