tag:blogger.com,1999:blog-34106823691189700682011-12-31T05:49:13.786+01:00How I wanted to build a huge Single Ended amp. And ended up in building a very small one using only the driver stage, with one tube and a dozen of other components...head1962http://www.blogger.com/profile/11083452177987168127noreply@blogger.comBlogger31100tag:blogger.com,1999:blog-3410682369118970068.post-76414153480606202512009-01-12T07:51:00.003+01:002009-01-12T07:58:48.819+01:00The first one is ready!!<div>Send it of on a long <span class="blsp-spelling-corrected" id="SPELLING_ERROR_0">journey</span>.</div><div>All the way to America</div><div>It <span class="blsp-spelling-corrected" id="SPELLING_ERROR_1">likes</span> it there</div><div>Wants to have brothers and sisters.</div><div><br /></div><div>Derek made some sides for it</div><div>And photos!!!!</div><div><br /></div><div><img src="http://4.bp.blogspot.com/_eePk-f1Usdk/SWrpW8jcs3I/AAAAAAAAAjg/g-cegdgPLZE/s320/38web.jpg" style="cursor:pointer; cursor:hand;width: 320px; height: 224px;" border="0" alt="" id="BLOGGER_PHOTO_ID_5290297292721271666" /><br /></div><div><img src="http://4.bp.blogspot.com/_eePk-f1Usdk/SWrpiGVvSbI/AAAAAAAAAjo/X4ZoXLfPEbI/s320/82web.jpg" style="cursor:pointer; cursor:hand;width: 320px; height: 226px;" border="0" alt="" id="BLOGGER_PHOTO_ID_5290297484326685106" /></div><div>And MAN!!!</div><div>Can he make photos!!!!!</div><div><a href="http://www.sandersonphoto.com/">http://www.sandersonphoto.com/</a><br /></div><div><br /></div><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/3410682369118970068-7641415348060620251?l=littlebigamp.blogspot.com' alt='' /></div>head1962http://www.blogger.com/profile/11083452177987168127noreply@blogger.com1tag:blogger.com,1999:blog-3410682369118970068.post-87675199776782710152008-11-24T08:50:00.006+01:002008-11-24T09:14:39.748+01:00Quite a few people have shown interest in the Little Amp...<br /><div>Decided to make some PCB's.<br /></div><div><br /></div><div><img src="http://4.bp.blogspot.com/_eePk-f1Usdk/SSpdqeg6ZwI/AAAAAAAAAgs/4WhQhiFODmI/s320/Outlook+(4).jpg" style="cursor:pointer; cursor:hand;width: 320px; height: 200px;" border="0" alt="" id="BLOGGER_PHOTO_ID_5272129298117584642" /></div><div><br /></div><div><br /></div><div><img src="http://2.bp.blogspot.com/_eePk-f1Usdk/SSpd8X6sQ2I/AAAAAAAAAg0/vrisyISrj2w/s320/Outlook+(7).jpg" style="cursor:pointer; cursor:hand;width: 320px; height: 240px;" border="0" alt="" id="BLOGGER_PHOTO_ID_5272129605584307042" /></div><div>On a 3D cad system first.</div><div>So you get a descent idea of what it looks like...</div><div>More ore less...</div><div><br /></div><div>In real life it looks like this</div><div><img src="http://2.bp.blogspot.com/_eePk-f1Usdk/SSpfi1sWqaI/AAAAAAAAAg8/zB3D1g06Mcs/s320/DSC_0061.JPG" style="cursor:pointer; cursor:hand;width: 320px; height: 215px;" border="0" alt="" id="BLOGGER_PHOTO_ID_5272131365923891618" /></div><div><br /></div><div>Jörg Ritter is a genious in making transformers.</div><div>These were made especially for my amp!</div><div>And they do sound marvelous!!!</div><div><br /></div><div><img src="http://1.bp.blogspot.com/_eePk-f1Usdk/SSpfjC245EI/AAAAAAAAAhE/Q89pgX0PUxU/s320/DSC_0062.JPG" style="cursor:pointer; cursor:hand;width: 320px; height: 215px;" border="0" alt="" id="BLOGGER_PHOTO_ID_5272131369457738818" /><br /></div><div><br /></div><div>The rear..</div><div><img src="http://4.bp.blogspot.com/_eePk-f1Usdk/SSpfveYGkJI/AAAAAAAAAhk/UKxeIfwaaVg/s320/DSC_0026.JPG" style="cursor:pointer; cursor:hand;width: 320px; height: 215px;" border="0" alt="" id="BLOGGER_PHOTO_ID_5272131583003234450" /></div><div><br /></div><div>The insides</div><div><img src="http://2.bp.blogspot.com/_eePk-f1Usdk/SSpfjYsgoTI/AAAAAAAAAhM/p0x-zQfnSWo/s320/DSC_0007.JPG" style="cursor:pointer; cursor:hand;width: 320px; height: 215px;" border="0" alt="" id="BLOGGER_PHOTO_ID_5272131375319785778" /></div><div><br /></div><div>Volume control....</div><div><img src="http://1.bp.blogspot.com/_eePk-f1Usdk/SSpfj9op-wI/AAAAAAAAAhc/md0hiGNBpQw/s320/DSC_0014.JPG" style="cursor:pointer; cursor:hand;width: 320px; height: 215px;" border="0" alt="" id="BLOGGER_PHOTO_ID_5272131385235733250" /><br /></div><div><br /></div><div>Front.</div><div>There are still the 2 sides missing...</div><div><img src="http://2.bp.blogspot.com/_eePk-f1Usdk/SSpfjRo8J9I/AAAAAAAAAhU/ADIHl-GynZk/s320/DSC_0001.JPG" style="cursor:pointer; cursor:hand;width: 320px; height: 215px;" border="0" alt="" id="BLOGGER_PHOTO_ID_5272131373425764306" /></div><div><br /></div><div><img src="http://3.bp.blogspot.com/_eePk-f1Usdk/SSpfvfXFQ_I/AAAAAAAAAhs/l40fN8OVe_w/s320/DSC_0028.JPG" style="cursor:pointer; cursor:hand;width: 320px; height: 215px;" border="0" alt="" id="BLOGGER_PHOTO_ID_5272131583267390450" /></div><div><br /></div><div>Why not put one of these Nixies in...</div><div><img src="http://2.bp.blogspot.com/_eePk-f1Usdk/SSpfvYAIPfI/AAAAAAAAAh0/AT2DotUXHKk/s320/vu2.jpg" style="cursor:pointer; cursor:hand;width: 320px; height: 215px;" border="0" alt="" id="BLOGGER_PHOTO_ID_5272131581292068338" /></div><div>Could be a VU meter and a linear clock at the same time.</div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/3410682369118970068-8767519977678271015?l=littlebigamp.blogspot.com' alt='' /></div>head1962http://www.blogger.com/profile/11083452177987168127noreply@blogger.com1tag:blogger.com,1999:blog-3410682369118970068.post-21641438558987167502007-08-28T15:17:00.001+02:002008-11-13T05:37:59.645+01:00<a href="http://3.bp.blogspot.com/_eePk-f1Usdk/RtQ4bZXfPJI/AAAAAAAAAAs/f9yEAmq59aA/s1600-h/IMG_7816.JPG"><img id="BLOGGER_PHOTO_ID_5103766321034640530" style="CURSOR: hand" alt="" src="http://3.bp.blogspot.com/_eePk-f1Usdk/RtQ4bZXfPJI/AAAAAAAAAAs/f9yEAmq59aA/s320/IMG_7816.JPG" border="0" /></a><br /><br />It all started with this huge triode!<br />The 100TH made by Eimac for radio transmitters in the 1940ties<br />Could run at 3KV @ 225mA!!<br />Found it in a military dump shop in Holland.<br />Yes.<br />It could be used for a Single Ended Triode amplifier.<br />With lots of power....<br />For a SE that is...<br />Well over 25Watts!!!!<br />With one tube!!<br /><br />Had to build a serious power supply.<br /><div>1200V with 250mA<br />Drove it first with a high voltage FET </div><div><br /><a href="http://4.bp.blogspot.com/_eePk-f1Usdk/RtQ41pXfPKI/AAAAAAAAAA0/-k6JwX1pTfc/s1600-h/IMG_7814.JPG"><span style="font-family:verdana;"><img id="BLOGGER_PHOTO_ID_5103766772006206626" style="CURSOR: hand" alt="" src="http://4.bp.blogspot.com/_eePk-f1Usdk/RtQ41pXfPKI/AAAAAAAAAA0/-k6JwX1pTfc/s320/IMG_7814.JPG" border="0" /></span></a><span style="font-family:verdana;"> </span></div><br /><div><br />That worked.<br />But of course you can't drive this huge glass and metal construction, which weighs almost a kilo, with a bit of plastic....<br /><br />This thing needs some smaller tube to drive it.<br />A 6EM7 would do. </div><div><br /><a href="http://1.bp.blogspot.com/_eePk-f1Usdk/RtaSNZXfPWI/AAAAAAAAACU/5OlqG7Y-WdI/s1600-h/DSCN1171.JPG"><span style="font-family:verdana;"><img id="BLOGGER_PHOTO_ID_5104427986516393314" style="CURSOR: hand" alt="" src="http://1.bp.blogspot.com/_eePk-f1Usdk/RtaSNZXfPWI/AAAAAAAAACU/5OlqG7Y-WdI/s320/DSCN1171.JPG" border="0" /></span></a><span style="font-family:verdana;"><br /></div></span><div>Tubes for TV's....<br />Dissimilar <span style="font-family:arial;">triode</span>.<br />Strange, 2 different triodes in 1 bulb.<br />1 makes a lot of voltage, the other a lot of current. </div><div><br /><a href="http://4.bp.blogspot.com/_eePk-f1Usdk/RtQ3ypXfPII/AAAAAAAAAAk/uwYRZSmZbH8/s1600-h/IMG_7819.JPG"><span style="font-family:verdana;"><img id="BLOGGER_PHOTO_ID_5103765620954971266" style="CURSOR: hand" height="285" alt="" src="http://4.bp.blogspot.com/_eePk-f1Usdk/RtQ3ypXfPII/AAAAAAAAAAk/uwYRZSmZbH8/s320/IMG_7819.JPG" width="362" border="0" /></span></a><br /></div><div>Wim drew the diagram.<span style="font-family:verdana;"> </span></div><div></div><div></div><div>Tried it all out.<br />Still alive.<br />There is a thousand volt on the anode!!<br />And that with 100mA.<br />So it needs 100Watts just to exist.<br />No sound yet.<br />Nothing. </div><div><span style="font-family:verdana;"><br /></div></span><div><span style="font-family:verdana;"></span></div><div><a href="http://3.bp.blogspot.com/_eePk-f1Usdk/RtQ5dZXfPLI/AAAAAAAAAA8/7lRMjm8UkHw/s1600-h/IMG_7813.JPG"><span style="font-family:verdana;"><img id="BLOGGER_PHOTO_ID_5103767454906006706" style="CURSOR: hand" alt="" src="http://3.bp.blogspot.com/_eePk-f1Usdk/RtQ5dZXfPLI/AAAAAAAAAA8/7lRMjm8UkHw/s320/IMG_7813.JPG" border="0" /></span></a></div><div></div><div></div><div>And the heating...........<br />5V at almost 10 amps... that's 50Watts too.<br />That's why it's red.<br />Red hot.<br /><br />Still no sound.<br />150W per channel.<br />Just to run it.<br />I only will use it in the winters<br /><br />Had to find some serious transformers...<br />And found them.<br />Ebay is great.<br />Hooked up some loud speakers to one side and Norah Jones to the other.<br /><br />Amazing!!!!<br />SE, now I knew.<br />Everything they write about it is just right,<br /><br />Then I thought:<br />If that little tube is so great at driving the huge one....<br />Could it also drive an output transformer?<br />Yes.<br /><br />Wim? </div><div><span style="font-family:verdana;"><br /></span><a href="http://3.bp.blogspot.com/_eePk-f1Usdk/RtQ6ZZXfPMI/AAAAAAAAABE/NLi-EiV9LN8/s1600-h/IMG_7865.JPG"><span style="font-family:verdana;"><img id="BLOGGER_PHOTO_ID_5103768485698157762" style="CURSOR: hand" alt="" src="http://3.bp.blogspot.com/_eePk-f1Usdk/RtQ6ZZXfPMI/AAAAAAAAABE/NLi-EiV9LN8/s320/IMG_7865.JPG" border="0" /></span></a><span style="font-family:verdana;"> </span></div><div><br />In stereo....<br />13 components per channel.<br />And nothing in the signal path.<br /><br />Build it all on a plank to see what would happen with Norah Jones.</div><div></div><div><a href="http://2.bp.blogspot.com/_eePk-f1Usdk/RtQ8JJXfPNI/AAAAAAAAABM/5OQA0HiwFfk/s1600-h/IMG_0002.JPG"><span style="font-family:verdana;"><img id="BLOGGER_PHOTO_ID_5103770405548539090" style="CURSOR: hand" alt="" src="http://2.bp.blogspot.com/_eePk-f1Usdk/RtQ8JJXfPNI/AAAAAAAAABM/5OQA0HiwFfk/s320/IMG_0002.JPG" border="0" /></span></a></div><div><br />More output transformers.<br />A lot smaller this time...<br />These ones are for 300b's (later)<br /><br />And a semiconductor rectifier.<br />That could not be right.<span style="font-family:verdana;"> </span></div><span style="font-family:verdana;"><div><br /></span></div><a href="http://1.bp.blogspot.com/_eePk-f1Usdk/RtQ8z5XfPOI/AAAAAAAAABU/-r90xlC1q1c/s1600-h/IMG_0011.JPG"><span style="font-family:verdana;"><img id="BLOGGER_PHOTO_ID_5103771139987946722" style="CURSOR: hand" alt="" src="http://1.bp.blogspot.com/_eePk-f1Usdk/RtQ8z5XfPOI/AAAAAAAAABU/-r90xlC1q1c/s320/IMG_0011.JPG" border="0" /></span></a><span style="font-family:verdana;"><br /></span><div>More transformers and a nice tube rectifier.<br />Now we're talking!<br />Norah liked it too.<br />1 Watt per channel.<br />I calculated and measured and modified.<br />Nothing doing.<br />1 Watt.<br />That's it. </div><div><br /><span style="font-family:verdana;"><a href="http://3.bp.blogspot.com/_eePk-f1Usdk/RtaRv5XfPTI/AAAAAAAAAB8/1xDU0g-wrO0/s1600-h/DSCN1159.JPG"><span style="font-family:verdana;"><img id="BLOGGER_PHOTO_ID_5104427479710252338" style="CURSOR: hand" alt="" src="http://3.bp.blogspot.com/_eePk-f1Usdk/RtaRv5XfPTI/AAAAAAAAAB8/1xDU0g-wrO0/s320/DSCN1159.JPG" border="0" /></span></a><br /></div></span><div>Build some speakers....<br /><br />2x 16ohm Electro Voice in parallel with a Fostex on top.<br />Open baffle</div><div><span style="font-family:verdana;"><br /></span><a href="http://3.bp.blogspot.com/_eePk-f1Usdk/RtaSE5XfPVI/AAAAAAAAACM/YJuFRISC1yU/s1600-h/DSCN1165.JPG"><span style="font-family:verdana;"><img id="BLOGGER_PHOTO_ID_5104427840487505234" style="CURSOR: hand" alt="" src="http://3.bp.blogspot.com/_eePk-f1Usdk/RtaSE5XfPVI/AAAAAAAAACM/YJuFRISC1yU/s320/DSCN1165.JPG" border="0" /></span></a></div><div></div><div>With a simple 6dB filter</div><div><br /><a href="http://3.bp.blogspot.com/_eePk-f1Usdk/RtaR95XfPUI/AAAAAAAAACE/cB0hkTy07U0/s1600-h/DSCN1164.JPG"><span style="font-family:verdana;"><img id="BLOGGER_PHOTO_ID_5104427720228420930" style="CURSOR: hand" alt="" src="http://3.bp.blogspot.com/_eePk-f1Usdk/RtaR95XfPUI/AAAAAAAAACE/cB0hkTy07U0/s320/DSCN1164.JPG" border="0" /></span></a></div><div></div><div>So that's close to a square metre.<br />Need some surface to have bass with 1 Watt.<br /><br />The speakers liked the amplifier<br />So did Norah.<br /><br />A box.<br />Daniel.<br />Is a wizard with wood.<br />I drew it up and Daniel.... </div><div></div><div><a href="http://2.bp.blogspot.com/_eePk-f1Usdk/RtQ9aJXfPPI/AAAAAAAAABc/NaEscdBXqzU/s1600-h/IMG_0055.JPG"><img id="BLOGGER_PHOTO_ID_5103771797117943026" style="CURSOR: hand" alt="" src="http://2.bp.blogspot.com/_eePk-f1Usdk/RtQ9aJXfPPI/AAAAAAAAABc/NaEscdBXqzU/s320/IMG_0055.JPG" border="0" /></a><span style="font-family:verdana;"><br /></span></div><div>In walnut no less! <span style="font-family:verdana;"><br /><br /></span>Now some steel and lots of holes and connectors.<br />And fit it all in.<br />Tight.<br />Why are boxes always too small?<br />Always... </div><div></div><div></div><div><a href="http://4.bp.blogspot.com/_eePk-f1Usdk/RtQ9zpXfPQI/AAAAAAAAABk/ru2j5IWSC4o/s1600-h/IMG_0070.JPG"><img id="BLOGGER_PHOTO_ID_5103772235204607234" style="CURSOR: hand" alt="" src="http://4.bp.blogspot.com/_eePk-f1Usdk/RtQ9zpXfPQI/AAAAAAAAABk/ru2j5IWSC4o/s320/IMG_0070.JPG" border="0" /></a><span style="font-family:verdana;"><br /></span></div><span style="font-family:verdana;"><div><br /></span></div><div>Tubes on top...<br />A nice square blue potentiometer for the volume.<br />Alps, just like the ones I can see from the window.</div><div></div><div><span style="font-family:verdana;"></span></div><div></div><div><a href="http://1.bp.blogspot.com/_eePk-f1Usdk/RtQ-o5XfPSI/AAAAAAAAAB0/2_TMytA8JEE/s1600-h/DSCN1087.JPG"><img id="BLOGGER_PHOTO_ID_5103773150032641314" style="CURSOR: hand" alt="" src="http://1.bp.blogspot.com/_eePk-f1Usdk/RtQ-o5XfPSI/AAAAAAAAAB0/2_TMytA8JEE/s320/DSCN1087.JPG" border="0" /></a><span style="font-family:verdana;"><br /><a href="http://1.bp.blogspot.com/_eePk-f1Usdk/RtQ-f5XfPRI/AAAAAAAAABs/9zQht0LOz7M/s1600-h/DSCN1104.JPG"><span style="font-family:verdana;"><img id="BLOGGER_PHOTO_ID_5103772995413818642" style="CURSOR: hand" alt="" src="http://1.bp.blogspot.com/_eePk-f1Usdk/RtQ-f5XfPRI/AAAAAAAAABs/9zQht0LOz7M/s320/DSCN1104.JPG" border="0" /></span></a><br /></div></span><br /><br /><div>Single ended<br />Single tube<br />DC coupled<br />1Watt<br /><br />You never need more.<br />Well....<br />Now the big brother....</div><div><span style="font-family:verdana;"><br /></span></div><div><br /> </div><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/3410682369118970068-2164143855898716750?l=littlebigamp.blogspot.com' alt='' /></div>head1962http://www.blogger.com/profile/11083452177987168127noreply@blogger.com2