[NLRS] PyroJoe 50 watt Toshiba Amp for 3456 - caution

[Jim Froemke]

You should be VERY careful to NOT overdrive these units. There have been
several reports of "bricking" them due to either spikes or steady state
overdrive. Aggressive heat sinking goes without saying.

Regards, Jim
K0MHC

-----Original Message-----
From: nlrs-bounces at mailman.qth.net [mailto:nlrs-bounces at mailman.qth.net] On
Behalf Of W0ZQ at aol.com
Sent: Saturday, April 25, 2009 9:49 AM
To: nlrs at mailman.qth.net
Subject: Re: [NLRS] PyroJoe 50 watt Toshiba Amp for 3456



Hi Charlie.  For the Toshiba 40 watt 3456  amp info, there are several 
sites on the web.  Here is one that includes  pin-out data: 
http://www.nr6ca.org/3456amp.html  .   Note that  the power requirement for
these is 12.3 VDC, 
not 13.8.   Running them  at 13.8 is asking for problems.  For my rover, I 
run my 13.8 vdc through a  Radio Shack power bridge rectifier that is bolted

to the same heatsink to drop  about 1.4 vdc.  So far, several years of good 
use without a  failure.   

Looking forward to working you in the June contest  on 6m through 10 GHz !

73, Jon
W0ZQ  

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