Maybe tetrode amps will make a comeback...! 73...Jordan VE6ZT
----- Original Message -----
From: "dan edwards" <w...@att.net>
To: "Brian Lloyd" <brian-wb6...@lloyd.com>; "Rob Sherwood" <r...@nc0b.com>
Cc: <flexradio@flex-radio.biz>
Sent: Friday, August 27, 2010 6:47 PM
Subject: Re: [Flexradio] linear amplifiers for the FLEX-1500
HEY, my 3-1000 still glows red....ha
w5xz, dan
--- On Fri, 8/27/10, Rob Sherwood <r...@nc0b.com> wrote:
From: Rob Sherwood <r...@nc0b.com>
Subject: Re: [Flexradio] linear amplifiers for the FLEX-1500
To: "Brian Lloyd" <brian-wb6...@lloyd.com>
Cc: flexradio@flex-radio.biz
Date: Friday, August 27, 2010, 10:55 PM
There are several Tokyo High Power linears that work well with QRP rigs.
http://k9ni.co.cc/thp/qpamps.html
My brother-in-law has an HL-50B that works well with his FT-817 and K2.
Many of these have problems with our FCC rules, as they can be used by
CBers.
I believe you can order them direct from Japan.
Considering all the places one can buy illegal (and cheap) CB linears,
include eBay and any truck stop, it is a shame an amateur who wants an THP
linear for his QRP rig has to get around the import rules.
In the boat anchor department, you might consider a Johnson Thunderbolt
amplifier. It has a pair of 4-400As that are grid driven. When I got my
license in 1961 there was a ham in my village that had one of these. He kept
the case off the unit, and as a result one could see the tubes glow read,
along with the 866s glowing blue. Pretty impressive to a 14 year old.
73, Rob, NCB
Brian Lloyd <brian-wb6...@lloyd.com> 8/27/2010 4:37 pm >>>
On Fri, Aug 27, 2010 at 11:49 AM, H A Layer <h...@sfsu.edu> wrote:
It would be interesting to compile a list of vintage and current linear
amplifiers for the FLEX-1500.
My TMC PAL-500 qualifies, as well as the Collins 367A-3 (KWT-6), which has
similar low-drive specs.
But, my heart be still! Just spotted: the ultimate vintage vacuum-tube
linear, a Collins 208U-10, that can be driven to full power by the
FLEX-1500:
http://cgi.ebay.com/VINTAGE-COLLINS-208U-10-SINGLE-4CX10000-/170531605031?pt=LH_DefaultDomain_0&hash=item27b479ca27
Specs indicate that only 0.2 Watts is needed for a full 10-kW output.
Perfect!!
Minor issues: it requires 3-phase 22-kW AC power and a 3500-pound
load-bearing floor.
That might be overkill. If you want something smaller (and cheaper) you
could consider the Johnson Thunderbolt. Two parallel 4-400s running grounded
cathode. Johnson claims only 10W drive is needed for full output. So the 5W
from the 1500 would only driver the t-bolt to half output, but that is still
around 1hp.
--
Brian Lloyd, WB6RQN/J79BPL
3191 Western Dr.
Cameron Park, CA 95682
br...@lloyd.com
+1.767.617.1365 (Dominica)
+1.931.492.6776 (USA)
(+1.931.4.WB6RQN)
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