Simply because they cannot get the 1000s from their supplier and no sign of
when they will be available .
I went thru this a couple months ago with them -- could not get a 1000 to
replace one that started arcing of course a few weeks after the warranty
as usual.
Anybody want to buy a pair of 1000s - one of which arcs about every two
seeks - I don't have a hi pot - cant find anyone with one around Phoenix .
Got tired of replacing cathode resistors. So now have pair 1500s in mine
too. Got more interesting projects than building a hi pot .
Hank - K7HP
-----Original Message-----
From: amps-request@contesting.com
Sent: Wednesday, October 29, 2014 9:00 AM
To: amps@contesting.com
Subject: Amps Digest, Vol 142, Issue 52
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Today's Topics:
1. Alpha 8410 using 4CX1500B - why? (Peter Sils via Amps)
2. Re: Alpha 8410 using 4CX1500B - why? (Prem)
3. Re: Alpha 8410 using 4CX1500B - why? (Pete Raymond)
4. Re: Alpha 8410 using 4CX1500B - why? (Vic Rosenthal 4X6GP/K2VCO)
----------------------------------------------------------------------
Message: 1
Date: Tue, 28 Oct 2014 13:35:00 -0700
From: Peter Sils via Amps <amps@contesting.com>
To: "amps@contesting.com" <amps@contesting.com>
Subject: [Amps] Alpha 8410 using 4CX1500B - why?
Message-ID:
<1414528500.83207.YahooMailNeo@web161305.mail.bf1.yahoo.com>
Content-Type: text/plain; charset=us-ascii
I recently acquired a slightly used 8410 (mfg 3/2014). I was surprised to
learn it had 4CX1500B tubes rather than the 4CX1000A's.
Looking at the RF Concepts website for tubes I notice the price is lower on
the 4CX1000A ($475) than the 4CX1500B ($525).
From what I have gathered the drive requirement is higher and the output is
lower.
Can anyone shed light on why Alpha chose to go with the 4CX1500B's?
TNX in advance of your insights!
73 Peter
KD0AA
------------------------------
Message: 2
Date: Tue, 28 Oct 2014 17:32:37 -0400
From: Prem <va3uma@gmail.com>
To: Peter Sils <kd6qv@yahoo.com>
Cc: "amps@contesting.com" <amps@contesting.com>
Subject: Re: [Amps] Alpha 8410 using 4CX1500B - why?
Message-ID:
<CAAK3FVAkrayRPii+oCyyFmXjj+Kn2SGV7Xxtn9jf+nHZ9C5qkg@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8
The first thing that comes to my mind is, the grid dissipation is 0W
(4CX1000A), and the plate dissipation is lower than a 4CX1500B.
I'm not sure about the o/p being lower in the 4CX1500B; should be higher as
per specs.
73,
Prem.
On Tue, Oct 28, 2014 at 4:35 PM, Peter Sils via Amps <amps@contesting.com>
wrote:
I recently acquired a slightly used 8410 (mfg 3/2014). I was surprised to
learn it had 4CX1500B tubes rather than the 4CX1000A's.
Looking at the RF Concepts website for tubes I notice the price is lower
on the 4CX1000A ($475) than the 4CX1500B ($525).
From what I have gathered the drive requirement is higher and the output
is lower.
Can anyone shed light on why Alpha chose to go with the 4CX1500B's?
TNX in advance of your insights!
73 Peter
KD0AA
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Message: 3
Date: Tue, 28 Oct 2014 22:57:50 -0400
From: Pete Raymond <n4kwpete@centurylink.net>
To: amps@contesting.com
Subject: Re: [Amps] Alpha 8410 using 4CX1500B - why?
Message-ID: <545057AE.9010609@centurylink.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hi Peter, I believe the drive on the 1500B is lower than the 1000A. Here
is a deal for you.
I have two never used 4CX1500B Eimac tubes never been in a socket for
that matter. I'll sell the for $420.00 each.
73 Pete N4KW
On 10/28/2014 4:35 PM, Peter Sils via Amps wrote:
I recently acquired a slightly used 8410 (mfg 3/2014). I was surprised to
learn it had 4CX1500B tubes rather than the 4CX1000A's.
Looking at the RF Concepts website for tubes I notice the price is lower
on the 4CX1000A ($475) than the 4CX1500B ($525).
>From what I have gathered the drive requirement is higher and the output
>is lower.
Can anyone shed light on why Alpha chose to go with the 4CX1500B's?
TNX in advance of your insights!
73 Peter
KD0AA
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------------------------------
Message: 4
Date: Wed, 29 Oct 2014 09:16:11 +0200
From: Vic Rosenthal 4X6GP/K2VCO <k2vco.vic@gmail.com>
To: amps@contesting.com
Subject: Re: [Amps] Alpha 8410 using 4CX1500B - why?
Message-ID: <5450943B.10507@gmail.com>
Content-Type: text/plain; charset=windows-1252; format=flowed
I believe the difference between the 1w grid dissipation rating of the
1500 and the 0w of the 1000 isn't significant and may only be a matter
of how the engineers decided to present it on the data sheet.
The 1500 has a different grid structure that is designed to produce
lower IMD than the 1000 (which is no slouch in that respect itself).
When operated according to specs the 1500 does produce less output than
the 1000 because it is less efficient. Hence the utility of additional
plate dissipation.
Incidentally, the Chinese 4CX100As sold by Alpha have the same kind of
anode cooler as the 1500s -- there is more fin area -- and so may have
more reserve plate dissipation.
On 28 Oct 2014 23:32, Prem wrote:
The first thing that comes to my mind is, the grid dissipation is 0W
(4CX1000A), and the plate dissipation is lower than a 4CX1500B.
I'm not sure about the o/p being lower in the 4CX1500B; should be higher
as
per specs.
73,
Prem.
On Tue, Oct 28, 2014 at 4:35 PM, Peter Sils via Amps <amps@contesting.com>
wrote:
I recently acquired a slightly used 8410 (mfg 3/2014). I was surprised to
learn it had 4CX1500B tubes rather than the 4CX1000A's.
Looking at the RF Concepts website for tubes I notice the price is lower
on the 4CX1000A ($475) than the 4CX1500B ($525).
From what I have gathered the drive requirement is higher and the output
is lower.
Can anyone shed light on why Alpha chose to go with the 4CX1500B's?
TNX in advance of your insights!
73 Peter
KD0AA
--
73,
Vic, 4X6GP/K2VCO
Rehovot, Israel
http://www.qsl.net/k2vco/
------------------------------
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