http://www.radiobanter.com (rec.radio.amateur.boatanchors) Topics related to classic amateur radio gear. Boatanchor equipment includes equipment constructed primarily with vacuum tubes, not solid state devices, and manufactured generally in the post WWII-to-1970 timeframe. en Fri, 24 May 2013 04:07:00 GMT vBulletin 60 http://www.radiobanter.com/images/002/misc/rss.jpg http://www.radiobanter.com http://www.radiobanter.com/showthread.php?t=194439&goto=newpost Sun, 12 May 2013 16:21:21 GMT I have started building a 7-MHz AM trasmitter with four suppressor-modulated 803s in push-pull-parallel. I expect to get nearly 400W of carrier power. My only concern is plate voltage. As a matter of fact I plan to use a power supply that delivers about 2800V under no-load conditions, which is... I have started building a 7-MHz AM trasmitter with four suppressor-modulated
803s in push-pull-parallel. I expect to get nearly 400W of carrier power.

My only concern is plate voltage. As a matter of fact I plan to use a power
supply that delivers about 2800V under no-load conditions, which is
considerably higher than the maximum allowed plate voltage (2000 V) and I
have no simple means to reduce it.

My intention would be to increase the negative grid bias, so as to reduce
plate current and stay within the allowed plate dissipation.

Does any one have experience of operating an 803 (or an 813 which is very
similar) at a much higher plate potential?

Thanks & 73.

Tony I0JX
Rome, Italy

]]> Boatanchors Antonio I0JX http://www.radiobanter.com/showthread.php?t=194439 http://www.radiobanter.com/showthread.php?t=194395&goto=newpost Fri, 10 May 2013 18:52:22 GMT Does anyone have a Tube LAYOUT for a HQ-100??? Does anyone have a Tube LAYOUT for a HQ-100??? ]]> Boatanchors fwp http://www.radiobanter.com/showthread.php?t=194395 http://www.radiobanter.com/showthread.php?t=194166&goto=newpost Wed, 01 May 2013 17:54:24 GMT Hello All,

I'm looking for an AM/CW rig in the 100 watt class, and may have a choice between a Heath DX-100 and a Heath Apache. In looking at the specs I could find on the two, the Apache looks like the better choice. What do you think?

Cheers,

Brian Ex: W5BRO, K6UCD
]]> Boatanchors Brian Burns http://www.radiobanter.com/showthread.php?t=194166