[Top] [All Lists]

Re: [Amps] Need some amplifier advice

Subject: Re: [Amps] Need some amplifier advice
From: gudguyham--- via Amps <>
Date: Tue, 25 Jun 2019 12:23:09 +0000 (UTC)
List-post: <>
Why do you insist on a tube power supply?  A simple FWB can be built with 3 amp 
or even 6 amp didoes which would be bullet proof at 500 watts.  Much commercial 
equipment has been built over the years running far more "key down" power than 
500 watts using solid state power supply.  That is nothing for solid state 
devices in a PS.  I suggest an 8877 tube for the job.  It has a 1500 watt 
dissipation so it will just be idling at 500 watts output.  If you want to 
build this yourself you can use 6A10 didoes in the power supply and a string of 
12 electrolytic caps.  You can use a transformer sold by Ameritron used in the 
Al-1500.  Make your own tank circuit.  When I built a 160 mono band amp I used 
an Al-1200 as a base amp converted it to 8877 with a 10 cap supply and made my 
own tank circuit.  That amp would just loaf at 500 watts.

-----Original Message-----
From: Joe Herdler via Amps <>
To: amps <>
Sent: Tue, Jun 25, 2019 8:10 am
Subject: [Amps] Need some amplifier advice

Hi All,
I am looking either for plans for an 80 meter mono-band amplifier optimized for 
the RTTY portion of the band or an actual amplifier itself. I want an all tube 
amplifier, including the power supply. I want no solid state components at all 
in this amp. I would like it to be very "overbuilt" so that when I run it at 
500 watts RF power, it is just idling. Of course, this is for RTTY, so it would 
be continuous duty at 500 Watts. I do not want to operate any higher than about 
5oo watts.
I would like full metering. It does not need to be rack mounted, but I do want 
a rugged chassis, and excessive ventilation to keep the tubes safe and so that 
those tubes last a long time. I do want it to be fully enclosed to keep four 
and two legged children safe from the lethal voltages.

Any ideas or locations for plans would be greatly appreciated.  

Thank you so much!
Joe Herdler KB0TXC
Amps mailing list
Amps mailing list
<Prev in Thread] Current Thread [Next in Thread>