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<p>While I basically agree with Glen's history and assessment of
Heath pushing 6146's, I have an interesting observation; I've <i>never</i>
changed a pair of 6146's, except to change one because it didn't
match the other. I have an ICOM, a Yaesu, a few Collins, and a
Drake 4 and 7 line , in addition to my Heathkits. The Heathkits
are by and far the most reliable radios I own. While I built my
401/303 combo while in college, the others were mostly swap finds,
and still, I find them more reliable than all of my others....</p>
<p>Guy,</p>
<p>WA6OQQ, another ham at Heath....<br>
</p>
<br>
<div class="moz-cite-prefix">On 2/4/2018 6:02 PM, Glen Zook via
Heath wrote:<br>
</div>
<blockquote type="cite"
cite="mid:1073031498.3387663.1517796146269@mail.yahoo.com">
<div style="color:#000; background-color:#fff;
font-family:Helvetica Neue, Helvetica, Arial, Lucida Grande,
sans-serif;font-size:16px">
<div id="yui_3_16_0_1_1517795094574_4872"><span
id="yui_3_16_0_1_1517795094574_4880">Methinks you mean 3 dB
instead of 1 dB with an increase from 100-watts to
200-watts. However, even that increase will not be noted in
most situations.</span></div>
<div id="yui_3_16_0_1_1517795094574_4872"><span><br>
</span></div>
<div id="yui_3_16_0_1_1517795094574_4872"><span><br>
</span></div>
<div id="yui_3_16_0_1_1517795094574_4872"><span><br>
</span></div>
<div id="yui_3_16_0_1_1517795094574_4872" dir="ltr"><span
id="yui_3_16_0_1_1517795094574_5280">As far as why Heath
increased the voltage: A new power transformer was used in
the HP-23A that had dual primary windings for 120 VAC and
240 VAC. Since a new transformer was being used, Heath went
ahead and increased the secondary voltage as well to
increase the power on the HW-10X and SB-1XX slightly. Of
course, Heath was never conservative on the power ratings of
their transmitters. Having the slightly higher voltage did
allow the equipment to come closer to the power ratings.
However, it has been my experience working on a lot of Heath
equipment that to make the power claimed by Heath involved
pushing the 6146 final amplifier tubes often to beyond their
ratings.</span></div>
<div id="yui_3_16_0_1_1517795094574_4872" dir="ltr"><span><br>
</span></div>
<div id="yui_3_16_0_1_1517795094574_4872" dir="ltr"><span><br>
</span></div>
<div id="yui_3_16_0_1_1517795094574_4872" dir="ltr"><span><br>
</span></div>
<div id="yui_3_16_0_1_1517795094574_4872" dir="ltr"><span
id="yui_3_16_0_1_1517795094574_5561">Remember, the original
6146 and 6146A / 8298 were rated at 90-watts for Class "C"
operation, 85-watts for AB-1 / AB-2 for SSB, and 67.5-watts
for AM (all input ratings). Heath pushed the tubes very
hard for both SSB and AM operation. Of course, back then,
the 6146 was in production and very common. Therefore, who
worried if the tubes did not last as long as possible!</span></div>
<div id="yui_3_16_0_1_1517795094574_4872" dir="ltr"><span><br>
</span></div>
<div id="yui_3_16_0_1_1517795094574_4872" dir="ltr"><span><br>
</span></div>
<div id="yui_3_16_0_1_1517795094574_4909"> </div>
<div class="signature" id="yui_3_16_0_1_1517795094574_4910">Glen,
K9STH </div>
<div class="signature" id="yui_3_16_0_1_1517795094574_4910"><br>
</div>
<div class="signature" id="yui_3_16_0_1_1517795094574_4910">Website:
<a class="moz-txt-link-freetext" href="http://k9sth.net">http://k9sth.net</a></div>
<div class="qtdSeparateBR" id="yui_3_16_0_1_1517795094574_4911"><br>
<br>
</div>
<div class="yahoo_quoted" id="yui_3_16_0_1_1517795094574_4916"
style="display: block;">
<div style="font-family: Helvetica Neue, Helvetica, Arial,
Lucida Grande, sans-serif; font-size: 16px;"
id="yui_3_16_0_1_1517795094574_4915">
<div style="font-family: HelveticaNeue, Helvetica Neue,
Helvetica, Arial, Lucida Grande, sans-serif; font-size:
16px;" id="yui_3_16_0_1_1517795094574_4914">
<div dir="ltr" id="yui_3_16_0_1_1517795094574_4913"> <font
id="yui_3_16_0_1_1517795094574_5390" size="2"
face="Arial">
<hr id="yui_3_16_0_1_1517795094574_5389" size="1"> <b><span
style="font-weight:bold;">From:</span></b> Kenneth
G. Gordon <a class="moz-txt-link-rfc2396E" href="mailto:kgordon2006@frontier.com"><kgordon2006@frontier.com></a><br>
<b><span style="font-weight: bold;">To:</span></b>
<a class="moz-txt-link-abbreviated" href="mailto:Heath@puck.nether.net">Heath@puck.nether.net</a> <br>
<b><span style="font-weight: bold;">Sent:</span></b>
Sunday, February 4, 2018 7:35 PM<br>
<b id="yui_3_16_0_1_1517795094574_5596"><span
style="font-weight: bold;"
id="yui_3_16_0_1_1517795094574_5595">Subject:</span></b>
Re: [Heath] HP-23 power supplies - an idea and some
questions.<br>
</font> </div>
<div class="y_msg_container"
id="yui_3_16_0_1_1517795094574_4917"><br>
<div dir="ltr" id="yui_3_16_0_1_1517795094574_4918"><br>
</div>
<div dir="ltr">You are absolutely correct, of course. <br>
</div>
<div dir="ltr"><br>
</div>
<div dir="ltr" id="yui_3_16_0_1_1517795094574_4924">In
fact, in order to increase the signal level at the
receiver enough to hear a difference, one <br>
</div>
<div dir="ltr" id="yui_3_16_0_1_1517795094574_5603">must
double the output power of the transmitter. 100 watts
to 200 watts for 1 db difference <br>
</div>
<div dir="ltr" id="yui_3_16_0_1_1517795094574_4945">at
the receiver.<br>
</div>
<div dir="ltr" id="yui_3_16_0_1_1517795094574_4926"><br>
</div>
<div dir="ltr" id="yui_3_16_0_1_1517795094574_4939">1
entire S unit (or 6 db, i.e. a power ratio of 4)
increase at the receiver requires increasing <br>
</div>
<div dir="ltr" id="yui_3_16_0_1_1517795094574_4940">transmitter
output power from 100 watts to 400 watts. Then another
S unit above that <br>
</div>
<div dir="ltr" id="yui_3_16_0_1_1517795094574_4941">requires
1600 watts. No thanks.<br>
</div>
<div dir="ltr"><br>
</div>
<div dir="ltr" id="yui_3_16_0_1_1517795094574_5604">I am
not concerned about power output here: to my way of
thinking, the lower voltage simply <br>
</div>
<div dir="ltr" id="yui_3_16_0_1_1517795094574_4943">"isn't
right.".<br>
</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">If it was not important, why did Heathkit
change the AC voltage from 268 to 282?<br>
</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">Are there deleterious effects due to the
lower voltage OTHER THAN power output? I <br>
</div>
<div dir="ltr">suspect so. <br>
</div>
<div dir="ltr" id="yui_3_16_0_1_1517795094574_5624"><br>
</div>
<div dir="ltr" id="yui_3_16_0_1_1517795094574_5606">Screen-grid
issues come to mind.<br>
</div>
<div dir="ltr" id="yui_3_16_0_1_1517795094574_5623"><br>
</div>
<div dir="ltr" id="yui_3_16_0_1_1517795094574_5622">But
none of the above concerns me.<br>
</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">So, I still have not gotten an opinion or
an answer to my question: is it likely that the 410 <br>
</div>
<div dir="ltr" id="yui_3_16_0_1_1517795094574_5621">VDC
across the 12.6 V winding of the added transformer is
too much, or is it acceptable?<br>
</div>
<div dir="ltr" id="yui_3_16_0_1_1517795094574_5609"><br>
</div>
<div dir="ltr" id="yui_3_16_0_1_1517795094574_5608">If
no one knows, I believe I'll try it to see. Empirical
evidence is always good.<br>
</div>
<div dir="ltr" id="yui_3_16_0_1_1517795094574_5610"><br>
</div>
<div dir="ltr" id="yui_3_16_0_1_1517795094574_5611"><br>
</div>
</div>
</div>
</div>
</div>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
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</pre>
</blockquote>
<br>
<div class="moz-signature">-- <br>
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