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Re: [Amps] 4 KW?

To: "jim.thom" <>
Subject: Re: [Amps] 4 KW?
From: Danny Pease <>
Date: Fri, 24 Jun 2022 13:41:58 -0500
List-post: <>
Isn't the FU728 the tubes used in recent Alpha Amplifiers? They are listing the 
tubes as 4CX1500B but I thought they were using Chinese tubes.


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On Jun 24, 2022, 1:19 PM, at 1:19 PM, "jim.thom" 
<> wrote:
>Date: Fri, 24 Jun 2022 06:14:27 -0500
>From: Rob Atkinson <>
>To: "" <>
>Subject: Re: [Amps] 4 KW?
><Never heard of the FU728F.  My concern would be that it vanishes like
><the 4CX1600.  Interesting about the failures.  I guess the type number
><is telling.  Say "FU" out loud.
>It's a chinese version of a 4CX-1500B..on steroids.  It's a popular
>that was used in Emtron amplifiers...and is currently being used in
>OM-Power amplifiers.
>1 Bad review on e-ham.
>Jim  VE7RF
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