Not Freescale parts Jerry, but the capable ST Micro SD2943 RF MOSFETs that
typically yield circa 400 Watts per device. I'm using four devices in
parallel push-pull per nominal 1200 Watt module; two 1200 Watt modules with
their outputs combined, so total of 8 FETS to conservatively produce the
nominal 2400 Watts. The maximum achievable Po is limited by the switch-mode
supply's Ampere capability!
Each module has the 4 device flanges on a 13mm x 220 x 300mm copper slab
heat spreader that bolts to a large aluminum finned heatsink that's cooled
with a whisper quiet low velocity 300mm long tangential cross-flow blower. I
think many commercial QRO S.S. amps skimp on the important thermal design
aspects, as well as the control and protection circuitry.
Yes indeed, I like my trusty old Kenwood TL922 amp with its pair of 3-500Z
instant-on thoriated tungsten filament tubes for that very same reason!
Cheers,
Leigh
VK5KLT
-----Original Message-----
From: Jerome Kaidor [mailto:jerry@tr4.tr2.com]
Sent: Tuesday, 20 November 2012 9:32 AM
To: Leigh Turner
Cc: amps@contesting.com
Subject: Re: [Amps] interesting statement in Dishtronix
Leigh Turner wrote:
>
> Turning on a tube amp and waiting for the heaters to warm up seems like an
> inordinate amount of time when you hear that rare DX station calling CQ;
> the solid-state amp being instantly ready for service!
*** That's one of the main advantages of an old-fashioned 811A linear like
the 30L-1. Flip the switch, and you have full power about a second later.
Running an 'L1 on RTTY seems abusive though. That's why I obtained my
Alpha 78.
A full-legal-limit SS amp would definitely be cool. Are you using the
Freescale parts?
- Jerry, KF6VB
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