[AMRadio] Any amplifier suggestions?

Bill McCourt - WF1L wemccourt at yahoo.com
Mon Oct 5 11:42:46 EDT 2009

Download the manual and schematic for Heathket SP-1000  or Ameritron AL-80.  It's a pretty straight forward design running a single 3-500 in grounded grid and good for 160 thru 10M  The earlier two 3-500 tube amps that heath sold might work better for AM as the final tubes won't have to work the duty cycle as long.  Also check out back copies (pre 1960) of the Handbook for earlier designs.
Good luck!


--- On Mon, 10/5/09, Todd Carpenter <n9ysq at yahoo.com> wrote:

From: Todd Carpenter <n9ysq at yahoo.com>
Subject: [AMRadio] Any amplifier suggestions?
To: AMRadio at mailman.qth.net
Date: Monday, October 5, 2009, 10:29 AM

I am interested is a simple design hf amplifier for am cw on 160-80/75-40. These are the bands i operate on where the extra power would help. Fewer parts count the better. Ultimately lower cost the better. I have power supply parts and believe that i can generate around 2000 volts. I am slowly researching tubes and am leaning toward 2 or 4 tubes that can basically generate lots of watts at half to two thirds their ratings to prolong their life span. Perhaps tubes such as 811's, 810's, 833's, 4-400's. I am open to suggestions. I will need to build or acquire a heavy duty matching system as part of the amp. My goal is at least 300 Watts AM. I do not want to mess with systems that require cooling other than fans. I am not interested in modes for this amp other than am and cw. It will almost exclusively be used for am as i rarely use more than 5 watts on cw any way. Simpler cheaper is better for me. I appreciate your suggestions. Todd  
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