¿ªÔÆÌåÓý¡°Although it¡¯s a handsome looking amp it¡¯s certainly not the best performer in its class. ?It lacks inductance on 160 and the tank isn¡¯t so good on 15 and 10¡±. ? So true, Louis. As Jim VE7RF also told me, my Emtron DX-2SP had the exact same issues on the low bands, but especially on 15, 12 and 10m. After a few years of 1200-1500W FT8 operation, my 10m and 15/12m tank coil tap flexible soldered silver plated conductors were black and the two connections to the tank coil had gone¡..bad. I re-made these two connections with 8mm flat silver plated copper conductor, held in place with tightening brass screws onto the tank coil and silver solder to make sure. Luckily, my band switch was unaffected by the high circulating currents. I added inductance on the toroidal tank inductor by moving the tap an additional 3 turns for 80m. This improved the efficiency up to around 60% (was below 40%) on 80m. Then I added some fixed loading capacitance on 160m which raised the efficiency on 160m from around 30% up to 50%. All of our Ham multi-band amps have these same problems, but they are solvable with a little help from the experts on here. ? My Emtron is now working well on all bands. ? Cheers, ? John VK6JX ? From: [email protected] <[email protected]> On Behalf Of Louis Parascondola via groups.io
Sent: Sunday, December 10, 2023 1:10 PM To: [email protected] Subject: Re: [ham-amplifiers] Ten-Tec Centurion Parts Needed ? TenTec buit?their own variable capacitors. ?So their plates are unlike any others. ?I have some plates and if you want you?ship me the cap I¡¯ll rebuild it for you. ?I should have a few plates left. ?Although it¡¯s a handsome looking amp it¡¯s certainly not the best performer in its class. ?It lacks inductance on 160 and the tank isn¡¯t so hood on 15 and 10. ? ? On Saturday, December 9, 2023, 6:51 PM, Tom Hess <Tomhess8@...> wrote:
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