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	<title>TubeSound</title>
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	<link>http://tubesound.com</link>
	<description>Vintage Audio Sales and Service</description>
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		<title>Transformers can blow in the blink of an eye</title>
		<link>http://tubesound.com/2012/04/15/transformers-can-blow-in-the-blink-of-an-eye/</link>
		<comments>http://tubesound.com/2012/04/15/transformers-can-blow-in-the-blink-of-an-eye/#comments</comments>
		<pubDate>Sun, 15 Apr 2012 22:42:13 +0000</pubDate>
		<dc:creator>Bob</dc:creator>
				<category><![CDATA[Blog]]></category>

		<guid isPermaLink="false">http://tubesound.com/?p=1290</guid>
		<description><![CDATA[Recently my longtime trusted Eico 1030 regulated high voltage DC power supply succumbed to a catastrophic failure &#8212; a shorted transformer winding.  The power transformer has a separate winding that supplies screen voltage to the 6L6 pass tubes.  This is a half-wave circuit that was rectified by one original 1N4006 silicon diode.  Unfortunately, this old [...]]]></description>
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		<slash:comments>0</slash:comments>
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		<item>
		<title>rare Rockola jukebox amp hum problem</title>
		<link>http://tubesound.com/2012/03/07/rare-rockola-jukebox-amp-hum-problem/</link>
		<comments>http://tubesound.com/2012/03/07/rare-rockola-jukebox-amp-hum-problem/#comments</comments>
		<pubDate>Wed, 07 Mar 2012 23:28:56 +0000</pubDate>
		<dc:creator>Bob</dc:creator>
				<category><![CDATA[Jukeboxes]]></category>

		<guid isPermaLink="false">http://tubesound.com/?p=1274</guid>
		<description><![CDATA[I wanted to write about a unique problem in a Rockola model &#8220;O&#8221; jukebox amplifier (from a Rockola 1426 jukebox, vintage 1946).  The amp is a very primitive design: class A, 4 tube operation consisting of 5U4 rectifier, push-pull 6L6&#8242;s, and 6J5 preamp tube.  An interstage transformer drives the P-P 6L6&#8242;s instead of a more [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Pluggers comic conjures &#8216;National Radio News&#8217;</title>
		<link>http://tubesound.com/2011/07/23/pluggers-comic-conjures-national-radio-news/</link>
		<comments>http://tubesound.com/2011/07/23/pluggers-comic-conjures-national-radio-news/#comments</comments>
		<pubDate>Sat, 23 Jul 2011 20:41:34 +0000</pubDate>
		<dc:creator>Bob</dc:creator>
				<category><![CDATA[Blog]]></category>

		<guid isPermaLink="false">http://tubesound.com/?p=1153</guid>
		<description><![CDATA[For tube fans, today&#8217;s Pluggers comic strip conjures memories of the NATIONAL RADIO NEWS magazine cover, Aug-Sept 1945 issue. The Pluggers comic is in today&#8217;s newspaper July 23, 2011, or you can enjoy the comic online at Comic Strip Nation, comic link is HERE. I mention this comic because many fans of old tube gear [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Limitations of cheap DPM&#8217;s and DMM&#8217;s</title>
		<link>http://tubesound.com/2011/05/13/limitations-of-cheap-meters/</link>
		<comments>http://tubesound.com/2011/05/13/limitations-of-cheap-meters/#comments</comments>
		<pubDate>Fri, 13 May 2011 22:29:25 +0000</pubDate>
		<dc:creator>Bob</dc:creator>
				<category><![CDATA[Blog]]></category>

		<guid isPermaLink="false">http://tubesound.com/?p=1097</guid>
		<description><![CDATA[©2011, Bob Putnak.  This post examines the performance (directly related to the input impedance) of low-cost meters; specifically, I explore a common multipurpose Colluck PM-128E DPM (digital panel meter) and a bargain-priced Cen-Tech #98025 multimeter. Limitations in the design of these low-cost meters can severely affect measurement accuracy.  First of all, I prove that the [...]]]></description>
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		<slash:comments>0</slash:comments>
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		<title>TubeSound TTM-1 Tube Tester &amp; Matcher</title>
		<link>http://tubesound.com/2011/04/13/tubesound-ttm-1-tube-tester-matcher/</link>
		<comments>http://tubesound.com/2011/04/13/tubesound-ttm-1-tube-tester-matcher/#comments</comments>
		<pubDate>Wed, 13 Apr 2011 21:15:19 +0000</pubDate>
		<dc:creator>Bob</dc:creator>
				<category><![CDATA[Blog]]></category>
		<category><![CDATA[Tube Testers]]></category>

		<guid isPermaLink="false">http://tubesound.com/?p=1074</guid>
		<description><![CDATA[Meet the TubeSound TTM-1: Testing of almost all amplifying tubes (triode, tetrode, pentode, beam power) from antique 4-pin (such as a #10, #45, or #50) through 9-pin novar (such as a 7868).   Socket configuration &#8212; 4-pin, 5-pin, 6-pin, 7-pin medium (aka 1625), 7-pin miniature, octal, loctal, 9-pin-miniature, and 9-pin novar. All tests use exact tube [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>PR: new hiring of Chief Technical Consultant</title>
		<link>http://tubesound.com/2011/04/01/ctc/</link>
		<comments>http://tubesound.com/2011/04/01/ctc/#comments</comments>
		<pubDate>Fri, 01 Apr 2011 12:36:03 +0000</pubDate>
		<dc:creator>Bob</dc:creator>
				<category><![CDATA[Blog]]></category>

		<guid isPermaLink="false">http://tubesound.com/?p=1068</guid>
		<description><![CDATA[April 1, 2011.  TubeSound, a worldwide vendor of audiophile tubes &#38; test equipment and service center, is pleased to announce the appointment of Snickers T. Dogg to the position of Chief Technical Consultant. &#8220;Snickers will be a valuable addition to our team by growing our service center in a valued-added result-driven manner.  He is a [...]]]></description>
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		<slash:comments>0</slash:comments>
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		<title>Testing VR (glow) tubes</title>
		<link>http://tubesound.com/2011/03/15/testing-vr-glow-tubes/</link>
		<comments>http://tubesound.com/2011/03/15/testing-vr-glow-tubes/#comments</comments>
		<pubDate>Wed, 16 Mar 2011 02:15:09 +0000</pubDate>
		<dc:creator>Bob</dc:creator>
				<category><![CDATA[Tubes]]></category>

		<guid isPermaLink="false">http://tubesound.com/?p=1045</guid>
		<description><![CDATA[©2011 Bob Putnak. I am frequently asked how to test voltage regulator (VR) tubes, which are sometimes called &#8220;glow regulator&#8221; or &#8220;glow discharge&#8221; tubes. Few tube testers test VR tubes, and most models that claim to test VR tubes do a worthless job at this task. They use AC voltages instead of DC the AC [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Fisher 500-B speaker connections</title>
		<link>http://tubesound.com/2011/02/05/fisher-500-b-speaker-connections/</link>
		<comments>http://tubesound.com/2011/02/05/fisher-500-b-speaker-connections/#comments</comments>
		<pubDate>Sun, 06 Feb 2011 03:42:53 +0000</pubDate>
		<dc:creator>Bob</dc:creator>
				<category><![CDATA[Receivers]]></category>

		<guid isPermaLink="false">http://tubesound.com/?p=999</guid>
		<description><![CDATA[Here are a few Q&#38;A&#8217;s about a Fisher 500-B receiver: 1) Q: &#8220;How do I connect speakers to my Fisher 500-B&#8221;? A: This is confusing if you are not familiar with Fisher equipment.  The photo below shows correct speaker connections to the 500-B.  I have seen other 500-B models with a slightly different layout, but [...]]]></description>
		<wfw:commentRss>http://tubesound.com/2011/02/05/fisher-500-b-speaker-connections/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Tube Matching with a Tube Tester</title>
		<link>http://tubesound.com/2010/10/27/tube-matching-with-a-tube-tester/</link>
		<comments>http://tubesound.com/2010/10/27/tube-matching-with-a-tube-tester/#comments</comments>
		<pubDate>Wed, 27 Oct 2010 21:38:52 +0000</pubDate>
		<dc:creator>Bob</dc:creator>
				<category><![CDATA[Blog]]></category>
		<category><![CDATA[Tube Testers]]></category>

		<guid isPermaLink="false">http://tubesound.com/?p=923</guid>
		<description><![CDATA[Copyrighted by Bob Putnak, all rights reserved. &#8220;Sometimes output tubes must be selected which will provide a satisfactory balance adjustment.  A tube tester usually will indicate whether a pair of tubes have reasonably similar characteristics.&#8221; &#8211; Robert Middleton, 101 Ways to Use Your Audio Test Equipment, Howard Sams Inc. [1] &#8220;Tube matching&#8221; is a controversial [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Testing a balanced rectifier on a tube tester</title>
		<link>http://tubesound.com/2010/08/25/testing-a-balanced-rectifier-on-a-tube-tester/</link>
		<comments>http://tubesound.com/2010/08/25/testing-a-balanced-rectifier-on-a-tube-tester/#comments</comments>
		<pubDate>Wed, 25 Aug 2010 19:35:31 +0000</pubDate>
		<dc:creator>Bob</dc:creator>
				<category><![CDATA[Tube Testers]]></category>

		<guid isPermaLink="false">http://tubesound.com/?p=902</guid>
		<description><![CDATA[Most tube testers were not designed to evaluate balanced plate sections when testing a filament-type rectifier tube. ©2010, Bob Putnak, TubeSound. When testing rectifiers such as 5U4, 5Y3, 5Z3 &#8230;have you ever wondered why one plate section tests stronger on your tube tester? Are all of your rectifier tubes really unbalanced? I was recently sent [...]]]></description>
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		<slash:comments>0</slash:comments>
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