Dave, the 8930 is in the AM-6154 and 6155 FAA amps, that are easily
converted to 144, 222 and 432 MHz, which Im fairly sure hasnt made it across
the pond in much quantity. They were 50W out AM linears which handle 400W of
CW and a clean 350W SSB with ease.
They initially had an even rarer Amperex DX-393. The Svetlana 4CX400A fits
right in.
Carl
KM1H
----- Original Message -----
From: "DAVE WHITE" <mausoptik@btinternet.com>
To: "Carl" <km1h@jeremy.mv.com>; <amps@contesting.com>; "Alek Petkovic"
<vk6apk@bigpond.com>
Sent: Sunday, July 17, 2011 5:50 AM
Subject: Re: [Amps] 4-1000
>I think the most I paid for a pair of good 4-1000A pulls was about DM100
>(about GBP35 at the time). I did come across a NOS Penta 4-1000A at
>Weinheim a number of years ago. I didn't know what to expect because the
>tube and the box were dated June 1961 (same as me!). At 50 years old both
>the tube and its owner are still going strong :-)
>
> As carl says, 8930s appear to be rare - in fact I don't think I've ever
> even seen one.
>
> cheers
>
> Dave G0OIL
>
> ----- Original Message -----
> From: "Carl" <km1h@jeremy.mv.com>
> To: <amps@contesting.com>; "Alek Petkovic" <vk6apk@bigpond.com>
> Sent: Sunday, July 17, 2011 2:07 AM
> Subject: Re: [Amps] 4-1000
>
>
>> When 4X1's and other tubes were common in BC AM and FM TX's the pulls
>> were
>> either trashed or given to anyone who asked. I used to get them
>> regularly,
>> build amps for others and then Id be ready for more.
>>
>> When station owners went with outside contractors servicing many
>> transmitters the sources dried up as the tubes were run down to the
>> basically useless level. Start on FM, go to AM RF service and then audio.
>> When I had to start buying them from other sources I never had to pay
>> over
>> $50, I even got a NIB 4PR1000A last year for $20 and a used regular 4X1
>> was
>> tossed in as an unknown.
>>
>> These days the sockets and chimneys are the hard part and its often
>> cheaper
>> to build with a poor IMD Ruskie or even an 8877 pull.
>>
>> The 4CX1000A/4CX1500B is similar. NIB tubes are everywhere cheap as the
>> military flooded the surplus market, $100-150 is typical. You need a
>> mortgage for the socket and even the Chinese one isnt cheap.
>>
>> The 4CX250/300/350 family is another military surplus item, the price is
>> climbing a bit as more hams decide to use them in lieu of more expensive
>> alternatives. $50-75 seems to be the latest range for NIB. The 8930 has
>> never been cheap unless your lucky as they werent in heavy use.
>>
>> Im still looking for another plastic 4x1 socket and a couple of chimneys.
>>
>> Carl
>> KM1H
>>
>>
>> ----- Original Message -----
>> From: "Alek Petkovic" <vk6apk@bigpond.com>
>> To: <amps@contesting.com>
>> Sent: Saturday, July 16, 2011 6:24 PM
>> Subject: Re: [Amps] 4-1000
>>
>>
>>> For a little more, you can take a risk on ebay item 130545179195.
>>>
>>> I wouldn't but you may.
>>>
>>> 73, Alek
>>> VK6APK
>>>
>>>
>>> At 11:28 PM 16/07/2011, Rex Lint wrote:
>>>>Guys,
>>>>
>>>>I've got $45 and I'm looking for a 4-100A. Any takers?
>>>>
>>>> -Rex-
>>>>
>>>> K1HI
>>>> Rex Lint
>>>> Merrimack, NH
>>>> WWW.QRZ.COM/db/k1hi
>>>>
>>>>
>>>>
>>>>
>>>>_______________________________________________
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>>>>http://lists.contesting.com/mailman/listinfo/amps
>>>>
>>>>
>>>>
>>>>
>>>>=======
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>>>
>>> From sunny Binningup, Western Australia
>>>
>>> http://www.qrz.com/db/vk6apk
>>> http://www.qrz.com/db/vk6ap
>>>
>>>
>>>
>>>
>>>
>>> =======
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