[Amps] Why are 833s so Expensive

[Roger]

On 9/26/2010 11:13 PM, Alek Petkovic wrote:
> Yeah, I've just bought 4 GU81M's and Dr Alex is posting me a pair of
> sockets as I write.
>
> Should be an interesting project. . . . if I can ever find the time.

At least it'll be impressive looking.  Staying within the ratings, they 
are derated in a hurry as you go up in frequency, but OTOH the GU81M is 
noted for being rugged. How far they can be pushed? I don't know.

The schematic listed shows a pair running 3 KW PEP up through 10 meters 
which is well beyond limits in the data sheet.  OTOH they appear to hold 
up well running them like that. It'd be interesting to see what the IM 
products are running them that hard.

I've been told by RUSSIAN hams that about the only way to hurt one is 
with a hammer.

I have one, but am thinking of getting at least one more, a couple of 
sockets and building a single band amp to start... Either 160 or 75.

I'd definitely have to keep it in the shop though as the hamshack in the 
house/den is only 10X12 and it gets hot in here with just the computers 
except during the really cold months.

73

Roger (K8RI)


>
> 73, Alek
> VK6APK
>
>
>
> At 08:28 AM 27/09/2010, Roger wrote:
>> Subject pretty much says it all.  833s are running over $125 ($258 for a
>> pair) each although they vary from $100 to $200 each on e-bay. I don't
>> know if they are selling any, but the price has been that way since last
>> spring.
>>
>> OTOH the RUSSIAN GU-81s (similar to, but not quite as strange looking as
>> the 833) are running from $22 to over $100 (typical $35 to $45 USD) plus
>> shipping which is roughly $20.  Now there is a monster that will help
>> heat the shack with it's warm glow.<:-)) A pair is good for close to
>> the legal limit out without forced air.  OTOH they are definitely not
>> the first choice for VHF.<:-))  Still, a pair would look great running
>> in a glass enclosure.
>>
>> 73
>>
>> Roger (K8RI)
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