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Re: [Amps] heat sinks

Subject: Re: [Amps] heat sinks
From: "Roger (K8RI)" <>
Date: Sun, 18 Nov 2018 20:50:49 -0500
List-post: <>
Now here is some nostalgia.

In the early days of SS, or at least a couple decades back I had a stack of big heatsinks. Some were a foot wide and longer than that I have no recollection of where they came from. I only remember, someone made me a good offer (really, really cheap by today's prices) and I sold the whole bunch. NOW I wish I had them back.  Of course after being a ham for 57 years there are a lot of things I can say that about like the early SS 600 W out 2-meter amp. Pushing 600W through quasi air core coax to a stacked pair of 14L KLMs sure worked well on simplex back in the 1970s.

73, Roger (K8RI)

On 11/17/2018 4:50 PM, Larry wrote:

I've played with some "highly efficient" amps. Don't like the complexity. For me at least, simpler is better. I can throw together a simple inefficient AB linear in a heartbeat. Electricity is no problem as I am right next to Grand Coulee Dam, cheapest power in the world.

I've used up all the heat sink stock I've collected over the years, and since I no longer live where there are hamfests and salvage yards, I don't have an easy way to replace them.

Lucky for me a few of this lists members have come to my rescue and I may have enough available shortly to keep me going for a few more years.

And yes, I have found no supplier better than HeatsinkUSA.

Thanks & 73,

Larry - W7IUV

On 11/16/2018 12:39 PM, Manfred Mornhinweg wrote:

my reply won't be the most helpful, but anyway:

Make a highly efficient amplifier. Then you don't need a huge heatsink.

Other than this, Heatsink USA is where I have bought heatsinks several times. Even from my location in Chile, with much more expensive international shipping, it was my best option.

Since then I have been collecting enough heatsinks from scrapped equipment to last for a while. Some huge ones come from a Siemens excitation control system for a big hydroelectric generator, and a big and very dense one, suitable for dissipating several kilowatts of heat with the help of a powerful blower, came from a Peltier chiller.

Maybe you can find some good big ones in industrial scrap yards. VVF drives for motors are massively used, rarely repaired when they fail, and the bigger ones often have rather large heatsinks in them.


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