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My 'direct inject" comment was geared towards the Uniden radio, external "rack gear" on a tube radio will present different challenges because of the high voltages used in the radio (and modulation transformer frequency response limitations); it's something I've never played with before. {here is some basic info though} But I bet with or two component value changes that Sonar radio will sound "phat" and pleasing (if it is not already).

I've got to say, the "distortion" I hear from my E.F. Johnson Messenger is pleasing to the ear, and warm sounding although the "audio frequency response" is severely limited; it is a different experience compared to the transistorized radios, a more "fuzzy" one.

<blockquote data-quote="LeapFrog" data-source="post: 603636" data-attributes="member: 46697">My &#039;direct inject&quot; comment was geared towards the Uniden radio, external &quot;rack gear&quot; on a tube radio will present different challenges because of the high voltages used in the radio (and modulation transformer frequency response limitations); it&#039;s something I&#039;ve never played with before.&nbsp; <a href="http://ratcliffe.co.za/sundry/Modify_Preamp_Circuitry.pdf" target="_blank">{here is some basic info though} </a>&nbsp; &nbsp;&nbsp; But I bet with or two&nbsp; component value changes that Sonar radio will sound &quot;phat&quot; and pleasing (if it is not already).I&#039;ve got to say, the &quot;distortion&quot; I hear from my E.F. Johnson Messenger is pleasing to the ear, and warm sounding although the &quot;audio frequency response&quot; is severely limited; it is a different experience compared to the transistorized radios, a more &quot;fuzzy&quot; one.</blockquote>

[QUOTE="LeapFrog, post: 603636, member: 46697"] My 'direct inject" comment was geared towards the Uniden radio, external "rack gear" on a tube radio will present different challenges because of the high voltages used in the radio (and modulation transformer frequency response limitations); it's something I've never played with before. [URL='http://ratcliffe.co.za/sundry/Modify_Preamp_Circuitry.pdf']{[U][COLOR=#0000ff]here is some basic info though[/COLOR][/U]} [/URL] But I bet with or two component value changes that Sonar radio will sound "phat" and pleasing (if it is not already). I've got to say, the "distortion" I hear from my E.F. Johnson Messenger is pleasing to the ear, and warm sounding although the "audio frequency response" is severely limited; it is a different experience compared to the transistorized radios, a more "fuzzy" one. [/QUOTE]

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