[Top] [All Lists]

[Amps] 3D Printed ABS Plastic for Chimneys?

To: "" <>
Subject: [Amps] 3D Printed ABS Plastic for Chimneys?
From: Dieter Kedrowitsch via Amps <>
Reply-to: Dieter Kedrowitsch <>
Date: Wed, 23 Nov 2016 19:19:42 +0000 (UTC)
List-post: <">>
Having been bit by the home-brew 3D printing bug I've been considering 
designing and printing my own cooling chimney for a GS-35B HF linear amplifier 
I built a few years ago.  Currently the chimney is an off-the-shelf Coleman 
lantern globe that loosely sits over the heatsink, so I'd rather use something 
that's more of an exact fit to ensure all my cooling air is forced up through 
the heatsink rather than around it.

I've read that styrenes like ABS make pretty good RF insulators, better in fact 
than Delrin or acrylics, so I'm curious to know if anyone has any input on the 
feasibility of using a 3D printed ABS chimney for high-voltage HF use?  I use 
high quality pure ABS filaments so I suspect it should be fine.  Does this 
sound like a safe bet or would I be best to avoid trying it.  Obviously the amp 
has copious mounts of protection built-in, but I'd rather avoid any potential 
for fireworks if possible.  

This particular amp and runs about 4KV on the plate and is capable of 1500W+ so 
obviously the ABS chimney would be exposed to extremely high voltages.  For 
specifics on the amp itself, I documented my build a little bit here:
Thanks and Cheers!

Amps mailing list
<Prev in Thread] Current Thread [Next in Thread>