{"version":1,"type":"rich","provider_name":"Libsyn","provider_url":"https:\/\/www.libsyn.com","height":90,"width":600,"title":"Ep. 139: &quot;I'm Going Negative&quot;","description":"It's the 139th episode of the Truth About Vintage Amps podcast, where amp tech Skip Simmons fields your questions on all-things-tube amps!&amp;nbsp; Want to be a part of our show? Just email us a question or voice memo to podcast@fretboardjournal.com. Some of the topics discussed this week:&amp;nbsp; :48 On the bench: A 1974 Alembic pre-amp, a Showman head in disguise  3:58 Webb's Music and a hang gliding pioneer  6:08 Our sponsors: Grez Guitars;  Emerald City Guitars and Amplified Parts; the Wood Wire &amp;amp; Volts Show in Anaheim (link);&amp;nbsp;Bruce Harvie of Orcas Island Tonewoods  11:10 Skip has a warning for the TAVA Kegger Facebook group...and others  14:38 A luthiers' pet peeve  16:55 Bias modulating tremolo, intensity pots 20:45 Skip works&amp;nbsp;on a Dan Torres-modded amp  21:35 Jason screens his Ben Harper Dumble film in Seattle; Ben Harper on TAVA (ep. 118) 25:34 When does Skip use his tube tester? 28:17 Should I turn this jukebox amp into a guitar amp? 30:52 A monitor out a la GA17RVT; Quilter amps; full-fat Greek yogurt 36:24 When do we get a Marshall\/Vox expert on the show? 37:58 A Kroker Triple Toad amp 40:13 Warming up a Nat Daniel-designed amp; separately mounted pre-amp tubes 42:17 Late '60s Fender biasing (AC568) 43:54 Skip's new guitar: A 1966 Fender Duo-Sonic 49:51 The&amp;nbsp;Fender Files on YouTube&amp;nbsp;(thanks, Larry Chung) 52:17 Using 5V4 rectifier tubes in a Matchless DC-30; Nduja mayonnaise (link) 1:00:17 Recommended reading: &quot;There Are No Electrons: Electronics for Earthlings&quot; (Amazon link); subbing a 6SL7 for a 6SN7 in a Gibson BR9 1:02:42&amp;nbsp;Transformer Corner: Using US amps overseas &amp;nbsp; 1:11:07 Recommended music: Henry Kaiser &amp;amp; David Lindley's &quot;Sweet Sunny North;&quot; Steve Melkisethian remembered 1:13:01 A cheap and easy output transformer dynamic test; rebuilding reverb tanks 1:19:54 Skip's map collection Hosted by amp tech Skip Simmons and co-hosted\/produced by Jason Verlinde of the Fretboard Journal.&amp;nbsp; Don't forget, we have a&amp;nbsp;Patreon page. Join us to get show updates and get to the front of the question line.&amp;nbsp; ","author_name":"The Truth About Vintage Amps with Skip Simmons","author_url":"http:\/\/vintageamps.libsyn.com\/website","html":"<iframe title=\"Libsyn Player\" style=\"border: none\" src=\"\/\/html5-player.libsyn.com\/embed\/episode\/id\/33515052\/height\/90\/theme\/custom\/thumbnail\/yes\/direction\/forward\/render-playlist\/no\/custom-color\/88AA3C\/\" height=\"90\" width=\"600\" scrolling=\"no\"  allowfullscreen webkitallowfullscreen mozallowfullscreen oallowfullscreen msallowfullscreen><\/iframe>","thumbnail_url":"https:\/\/assets.libsyn.com\/secure\/item\/33515052"}