[Top] [All Lists]

Re: [Amps] new Alpha

To: <>
Subject: Re: [Amps] new Alpha
From: "Paul Christensen" <>
Date: Sat, 22 Jan 2022 09:56:56 -0500
List-post: <>
>"OM Power uses the Chinese FU728, about a $400 tube but can’t hold a candle to 
>s your Eimac tube."

Seems fine with my OM Power 2000A+ amp that runs 24/7 at my remote site.  The 
amp is never turned off.  Being a tetrode, the FU728 easily produces 20 dB of 
gain.  15W in delivers 1500W out all the way through 6m.  Not sure if I'm just 
lucky but I've been happy with the amp and quality of the FU728 tube.  

The amp does have some issues that are addressed on my QRZ page, all of which 
are manageable by the end-user.  For example, when using QSK, approximately 10% 
of the keyed CW elements result in hot-switching the input T/R relay.  The root 
cause appears to be a periodic interrupt in the microcontroller code.  I solved 
the problem with an optocoupler.  The optocoupler senses the input key line and 
forces the input relay to close when in operate mode.   Problem solved. 

Paul, W9AC 

Amps mailing list
<Prev in Thread] Current Thread [Next in Thread>