[Top] [All Lists]

Re: [Amps] MFJ

Subject: Re: [Amps] MFJ
From: John Lyles <>
Date: Sun, 28 Apr 2024 21:04:57 -0600
List-post: <>
There is still a lot of broadcast FM transmitters in the US and worldwide using CPI/Eimac ceramic/metal tetrodes and triodes. Only need installs and stations with the bucks can afford to buy a new SS transmitter right now. Also, scientific market still depends on Eimac tubes, the larger ones. Fermilab in Chicago has a synchrotron with many 4CW150,000E equivalents. HAARP in Alaska has at least 96 transmitters that each have a pair of 4CX10,000D. Where I work, we buy Y847C, a glass HV switchtube, from them (a recent design BTW) and we buy klystrons from CPI as well. A lot of science labs use their klystrons. I agree that the smaller tubes, sub 2 kW varieties, are not selling as much, and the price has soared. I would not suggest CPI/Eimac is out of business.




Message: 1
Date: Sat, 27 Apr 2024 16:52:41 -0400
From: Douglas L<>
Subject: Re: [Amps] MFJ

Since virtually all broadcast transmitters and medical equipment has gone solid 
state, we amateurs are about the only users of transmitting vacuum tubes. With 
declining sales, prices have skyrocketed. Eimac division of Varian must be 
nearly out of business. Of course by jacking up prices so much, they have 
hastened their own decline.

The Chinese are the only ones making glass tubes like the 3-500Z, 811 and the 
They?re also mailing most of the ceramic tubes like the 3CX800A7, even though 
they?re pricing it at around $900. I suppose we should be thankful for them. ?

With the demise of Ameritron, as others have pointed out, there will be no 
sources of linear amps under $3000.

On Apr 27, 2024, at 6:59 AM, Rob Atkinson<>  wrote:

?I think the glass tube amps are still finding buyers, along with the
s.s. amps.  If Ameritron continues, the ceramic tube amps will likely
be discontinued.  Those tubes are crazy expensive but the single 3-500
and 811A products seem to be selling well.


Amps mailing list

<Prev in Thread] Current Thread [Next in Thread>