[Amps] heat sinks

[Roger (K8RI)]

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:
> Manfred,
>
> 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:
>> Larry,
>>
>> 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.
>>
>> Manfred
>>
>> ========================
>> Visit my hobby homepage!
>> http://ludens.cl
>> ========================
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-- 
Roger (K8RI)