Once upon a time in a guitar shop far, far away... 0:08 Save 10% on Native Sons Straps with this code: GUITOLOGIST10 https://www.nativesonsgoods.com/ 0:42 Mark Agnesi responds to questions about his employment, calls The Guitologist and Phillip McKnight "Fake News", ridicules others 3:15 Why I was not invited to 42 Gear Street event in Germany with Henning Pauly, Glenn Fricker and others 3:46 Travelling to promote guitar gear isn't worth it 4:26 Just about every rock legend will die soon https://tinyurl.com/y5axqjlk 5:00 Morbid Angel guitarist Richard Brunelle dead at 55 https://tinyurl.com/yyjupvz9 5:59 Pete Townshend of The Who says guitar based rock is dead because virtuoso players have exhausted the possibilities of the instrument https://tinyurl.com/yxrc8wac 8:28 Carlos Santana makes the cover of AARP magazine https://tinyurl.com/y2nvgtjd 9:31 YOUR GEAR: 1980s Casio PG-310 Synth Guitar 10:35 Holmes Pro Compact 210 guitar amp 11:46 ASK AN AMP TECH: What makes a guitar tone "tight" vs. "flubby"? 14:08 Comparing a Fender 5F6A Bassman and a Marshall JMP 1987 Super Lead schematic 20:22 Troubleshooting a 1957 Fender 5F1 Tweed Champ with schematic ---------------------------------------------------------- *WAYS YOU CAN SUPPORT THIS CHANNEL:* ♠Stand in the Middle of the Street Naked Screaming "LONG LIVE THE GUITOLOGIST"! OR ♠Send an unwanted piece of gear or send a small tip via Paypal: bradlinzy@gmail.com Thanks for your support! ♠STUFF I USE -5A Variac: http://amzn.to/2FNWthU -Jameco Isolation Transformer: https://amzn.to/2PRv1Fa -Fluke 87: http://amzn.to/2DwHjvr -Yotec 936 Soldering Station: http://bit.ly/2JqB1Vw -Sealody SSA51 soldering station: http://amzn.to/2DJTS7P -Black and Decker Heat Gun: http://amzn.to/2DWpDhr -Geekcreit® LCR-T4 Mega328 Transistor Tester http://bit.ly/2J9uLSA -HT02 Handheld Infrared Thermal Camera http://bit.ly/2LXfLoD -Solderless Breadboard: http://bit.ly/2stkVAq -Breadboard Jumper Wires: http://bit.ly/2JowaEh -Geekcreit® XR2206 Function Signal Generator DIY Kit http://bit.ly/2LYBvkb -Contact Cleaner: http://amzn.to/2FVitro -Deoxit Fader Cleaner: https://amzn.to/2LPwtsE ♠RECORDING -JVC Everio Camcorder https://amzn.to/2RLIleU -Andonstar USB Microscope: https://bit.ly/2q8QIWz -Articulated Boom Arm with Cam Mount: https://amzn.to/2Hlo2AX -Shure Beta 87A https://amzn.to/2rNPnoW -EV 635A Omnidirectional Dynamic Mic https://amzn.to/2pR8HQT ♠BOOKS -RCA TUBE MANUAL http://amzn.to/2GOBVqS -DESIGN AND CONSTRUCTION OF TUBE AMPLIFIERS: http://amzn.to/2HSNMne -Designing Tube Preamps for Guitar and Bass: http://amzn.to/2DK5tmt ♠2006 FENDER AMERICAN STD TELECASTER PICKUPS -TV Jones Magnatron Neck: https://amzn.to/2q1zQjD -Seymour Duncan Vintage Stacked Bridge: https://amzn.to/2GyZjrK ... https://www.youtube.com/watch?v=sMwwhOK3o5c

In this video we'll do a complete teardown and demo of an all-original, vintage Magnatone 260 tube combo amp. This was near Maggie's top of the line at the time and featured their innovative and impressive frequency modulating vibrato circuit. This patented circuit, also called the "F.M. Vibrato", used a 12ax7 oscillator circuit, two 6CG7 tubes, and four varistors, also known as a voltage-dependent resistors (VDR), to manipulate the phase of different signals and thereby achieve a real modulating pitch. For anyone wishing to build a clone of this Magnatone Vibrato circuit, Terry Dobbs (Mr. Valco) has told me he thinks the modern equivalent varisistor for the Magnatone original is Metrosil series # 100-P-W/921. While I cannot confirm the accuracy of this, it might be a good place to begin experimenting. Terry also told me, "legend has it that other old stock subs for the Workman FS1205 are the Zenith 63-5058, Zenith 63-10868, workman #'s FS-308, FR-1039 and FS-1226 I have not personally verified these or the Metrosil's as I still have a couple FS-1205's left in stock." He says his info came from Gary, who used to build Juke Amps. Hope that info helps someone wishing to clone this extraordinarily great-sounding tube circuit. Sources: http://magnatoneamps.com/260.html http://el34world.com/Forum/index.php?topic=15073.0 ... https://www.youtube.com/watch?v=LmBEWZ75EGI