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    <p>I have used the YU-209 see: 
<a class="moz-txt-link-freetext" href="http://forums.qrz.com/index.php?threads/8877-3cx1500-yu-209-tubes.202153/">http://forums.qrz.com/index.php?threads/8877-3cx1500-yu-209-tubes.202153/</a> 
      and traded a big TV tube for several of these they seem to be a
      'hardened 8877'. My understanding is these tubes are used in
      medical MRI machines and are replaced at 100 hours routinely. the
      $250 USD seems typical Ted WA8ULG<br>
    </p>
    <br>
    <div class="moz-cite-prefix">On 11/22/2016 8:46 AM, <a class="moz-txt-link-abbreviated" href="mailto:TexasRF@aol.com">TexasRF@aol.com</a>
      wrote:<br>
    </div>
    <blockquote cite="mid:845aa.7ac5840.4565c266@aol.com" type="cite">
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        <div>Both tubes will plug into the same 7 pin ceramic socket
          used by 813 and other tubes back 60 years or more. You have to
          add grid grounding tabs but that is trivial. </div>
        <div> </div>
        <div>73,</div>
        <div>Gerald K5GW</div>
        <div> </div>
        <div> </div>
        <div> </div>
        <div>
          <div>In a message dated 11/22/2016 9:05:51 A.M. Central
            Standard Time, <a class="moz-txt-link-abbreviated" href="mailto:nss@mwt.net">nss@mwt.net</a> writes:</div>
          <blockquote style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px;
            BORDER-LEFT: blue 2px solid"><font style="BACKGROUND-COLOR:
              transparent" face="Arial" color="#000000" size="2"><br>
              <br>
              <font size="+1"><font face="Consolas">Has anyone
                  homebrewed tube sockets?<br>
                  <br>
                  I mean WOW, the prices on some sockets, Wow!<br>
                  <br>
                  Joe WB9SBD<br>
                </font></font>
              <div class="moz-signature"><img
                  src="cid:part1.FFF6FD58.EBFF6A13@earthlink.net" alt=""
                  datasize="9572" id="MA1.1479829605" height="96"
                  width="120"><small><small><br>
                    <span style="FONT-FAMILY: comic sans ms">The
                      Original Rolling Ball Clock</span><br
                      style="FONT-FAMILY: comic sans ms">
                    <span style="FONT-FAMILY: comic sans ms">Idle Tyme</span><br
                      style="FONT-FAMILY: comic sans ms">
                    <span style="FONT-FAMILY: comic sans ms">Idle-Tyme.com</span><br
                      style="FONT-FAMILY: comic sans ms">
                    <a moz-do-not-send="true"
                      title="http://www.idle-tyme.com/"
                      style="FONT-FAMILY: comic sans ms"
                      href="http://www.idle-tyme.com/">http://www.idle-tyme.com</a></small></small><br>
              </div>
              <div class="moz-cite-prefix">On 11/22/2016 8:47 AM, W1KSZ
                wrote:<br>
              </div>
              <blockquote
                cite="mid:1f677b11-5d7c-4391-733f-b6c5615dd047@earthlink.net"
                type="cite">
                <p>You can download the datasheets for each tube and
                  verify if any differences do exist.</p>
                <p><br>
                </p>
                <p>73, Dick, W1KSZ<br>
                </p>
                <br>
                <div class="moz-cite-prefix">On 11/22/2016 7:38 AM,
                  F5HRY wrote:<br>
                </div>
                <blockquote
                  cite="mid:841997447.12617.1479825496261.JavaMail.www@wwinf1p14"
                  type="cite">
                  <p>Be also aware that the mechanical dimensions are
                    not strictly similar.</p>
                  <p> </p>
                  <p>As fas as I remember (quite a long time since I
                    finished my last amp), the anode</p>
                  <p>heatsink is a bit higher for the 3CPX.</p>
                  <p> </p>
                  <p>73,</p>
                  <p>Hervé F5HRY</p>
                  <p> </p>
                  <p> </p>
                  <blockquote style="PADDING-LEFT: 5px; MARGIN-LEFT:
                    5px; BORDER-LEFT: #ff0000 2px solid">&gt; Message du
                    22/11/16 10:46<br>
                    &gt; De : "Martin Andrew" <a
                      title="mailto:martin.andrew@btinternet.com"
                      class="moz-txt-link-rfc2396E"
                      href="mailto:martin.andrew@btinternet.com"
                      moz-do-not-send="true">&lt;martin.andrew@btinternet.com&gt;</a><br>
                    &gt; A : <a
                      title="mailto:moon-net@mailman.pe1itr.com"
                      class="moz-txt-link-abbreviated"
                      href="mailto:moon-net@mailman.pe1itr.com"
                      moz-do-not-send="true">moon-net@mailman.pe1itr.com</a><br>
                    &gt; Copie à : <br>
                    &gt; Objet : Re: [Moon-Net] 3CX1500A7 (8877) or
                    3CPX1500A7 ?<br>
                    &gt; <br>
                    &gt;
                    <meta>
                    <meta>
                    <div><font face="Arial" size="2">Thanks for the
                        replies on this.</font></div>
                    <div><font face="Arial" size="2">I was pretty
                        certain the two tubes were interchangable with a
                        few minor voltage</font></div>
                    <div><font face="Arial" size="2">adjustments, but it
                        is always better to ask than go blindly into
                        something one is not 100% sure about.</font></div>
                    <div> </div>
                    <div><font face="Arial" size="2">So in January I
                        will be starting the search for a spare
                        3CPX1500A7 preferably with Europe.</font></div>
                    <div> </div>
                    <div><font face="Arial" size="2">Again many thanks
                        for the help and information..</font></div>
                    <div> </div>
                    <div><font face="Arial" size="2">Martin, GM6VXB</font></div>
                    <blockquote style="PADDING-LEFT: 5px; MARGIN-LEFT:
                      5px; BORDER-LEFT: #000000 2px solid;
                      PADDING-RIGHT: 0px; MARGIN-RIGHT: 0px" dir="ltr">
                      <div style="FONT: 10pt arial">----- Original
                        Message -----</div>
                      <div style="BACKGROUND: #e4e4e4; FONT: 10pt arial;
                        font-color: black"><strong>From:</strong> <a
                          title="mailto:martin.andrew@btinternet.com"
                          href="mailto:martin.andrew@btinternet.com"
                          moz-do-not-send="true">Martin Andrew</a></div>
                      <div style="FONT: 10pt arial"><strong>To:</strong>
                        <a title="mailto:moon-net@mailman.pe1itr.com"
                          class="moz-txt-link-abbreviated"
                          href="mailto:moon-net@mailman.pe1itr.com"
                          moz-do-not-send="true">moon-net@mailman.pe1itr.com</a></div>
                      <div style="FONT: 10pt arial"><strong>Sent:</strong>
                        Monday, November 21, 2016 7:49 PM</div>
                      <div style="FONT: 10pt arial"><strong>Subject:</strong>
                        [Moon-Net] 3CX1500A7 (8877) or 3CPX1500A7 ?</div>
                      <div><br>
                        &gt;</div>
                      <div><font face="Arial" size="2">Looking to get a
                          spare tube as down to my last one now after a
                          failure in the old HPA.</font></div>
                      <div><font face="Arial" size="2">Heater failure
                          yet again even with a good three stage heater
                          'step start' fitted.</font></div>
                      <div> </div>
                      <div><font face="Arial" size="2">Been looking for
                          a 3CX1500A7 (8877) but they seem to be getting
                          pretty rare in the UK and also very expensive.</font></div>
                      <div><font face="Arial" size="2">So also looking
                          at the 3CPX1500A7 which except for Anode
                          voltage seems pretty similar, and also much
                          lower price.</font></div>
                      <div><font face="Arial" size="2">I know that the
                          EHT supply I have will not go to much above
                          3.5KV so wondering if the 3CPX1500 is happy
                          with a much lower anode voltage than the
                          specified 10KV max</font><font face="Arial"
                          size="2">.</font></div>
                      <div> </div>
                      <div><font face="Arial" size="2">Before I look at
                          ordering one (or should I stay with the 8877
                          ?) does anyone know if the 3CPX is a 'near'
                          direct replacement for the 3CX series tube ?.</font></div>
                      <div><font face="Arial" size="2">Physical size is
                          the same and looks like it will go easily to
                          200Mhz.</font></div>
                      <div> </div>
                      <div><font face="Arial" size="2">Martin, GM6VXB</font></div>
                      <p>&gt;</p>
                      <hr>
                      <p>&gt;</p>
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                        &gt;</p>
                      <p>&gt;</p>
                      <hr>
                      <p>&gt;</p>
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