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https://akavalve.blogspot.com/2008/12/ampeg-v4-curiousities-part-2.html akavalve: Ampeg V4 curiousities part 2 This is a look a some of the less common tubes used in the preamp section of the V4. There's also a view of the circuit board revealing one ... ampeg curiousities part https://www.blogger.com/profile/12711596868057550892 Blogger: User Profile: akavalve Blogger is a blog publishing tool from Google for easily sharing your thoughts with the world. Blogger makes it simple to post text, photos and video onto your... blogger user profile https://akavalve.blogspot.com/2009/01/reading-capacitor-values-part-1.html akavalve: Reading Capacitor Values Part 1 Reading capacitors values from schematics or even parts lists can be confusing. There are a few basic rules to keep in mind that will make i... reading capacitor values part https://akavalve.blogspot.com/2009/02/fener-champion-600-12dw7-ecc832-mod.html akavalve: Fedner Champion 600 12DW7 / ECC832 Mod Part 1 - Update I'm focusing here on the 12DW7 / ECC832 partly out of curiosity and partly because it's half the work to rebias for the new tube. What is a ... champion mod part update https://akavalve.blogspot.com/2009/02/022-uf-xicon-from-mouser.html akavalve: Fender 5E1 / Champion 600 Coupling Cap Mod "Kit" The stock capacitor in a Fender Champ 5E1 and 5F1 circuits is .022uF. This allows a great deal of bass through the circuit and the cap is f... fender champion coupling cap mod https://akavalve.blogspot.com/2009/07/where-is-dangerous-voltage-in-tube-amp.html akavalve: Where is the dangerous voltage in a tube amp? "UNPLUG YOUR AMPLIFIER AND DISCHARGE THE FILTER CAPS BEFORE YOU START WORK INSIDE A TUBE AMPLIFIER. THERE ARE LETHAL VOLTAGES INSIDE THAT CA... in a dangerous voltage tube amp https://akavalve.blogspot.com/2009/01/fender-champion-600-cathode-bypass-mod_08.html akavalve: Fender Champion 600 Cathode Bypass Mod Pt 3 Here's the response curve for the switched cathode bypass caps in part 2 of this post. The first graph is for the stock tone stack: From t... fender champion cathode bypass mod https://akavalve.blogspot.com/2009/07/angled-desoldering-tool-for-cleaning.html akavalve: An angled desoldering tool for cleaning tube socket terminals Removing components and solder from tube socket tabs is not difficult. But it's a tedious business. If you're removing a lot of components ... for cleaning angled desoldering tool tube https://akavalve.blogspot.com/2009/01/fender-champion-600-input-voicing-mod.html akavalve: Fender Champion 600 Input Voicing Mod This is probably the simplest of the mods I did to this Champion 600 . Since I put in the 12dw7 the "low" input wasn't really very useful ... fender champion input voicing mod https://akavalve.blogspot.com/2009/03/fender-champion-600-preamp-bias-part-2a.html akavalve: Fender Champion 600 Preamp Bias Part 2a The the last post we found one of two points we need to draw the load line for first 12AX7 gain stage in a Champion 600. We'll use the load... fender champion preamp bias part https://akavalve.blogspot.com/2009/01/fender-champion-600-tube-upgrade.html?showComment=1269386346970 akavalve: Fender Champion 600 Tube Upgrade I don't think of myself as a huge tube snob but the stock 6V6 tube in this Champion 600 was really pretty bad. It was inarticulate and mush... fender champion tube upgrade https://akavalve.blogspot.com/2008/12/fender-champion-600-mods-part-1.html akavalve: Fender Champion 600 Part 1 Below is a frequency plot for a Fender Champion 600 using it's own speaker first, then with the internal speaker unhooked and the Champion a... fender champion part https://akavalve.blogspot.com/2009/01/fender-champion-600-tone-stack-bypass.html akavalve: Fender Champion 600 Tone Stack Bypass/ Fat Switch Mod This pic shows the shows a few of the mods I've made to this Champion 600 . The two small red switches on the bottom of the chassis are for... bypass fat fender champion tone stack https://akavalve.blogspot.com/2009/01/fender-champion-600-discharging-filter.html akavalve: Fender Champion 600 - Discharging the Filter Caps Pt 1 Here's the procedure for discharging the filter caps in a Fender Champion 600. The video is pretty small so I'll put up another post with pi... the filter fender champion discharging caps https://akavalve.blogspot.com/2008/12/disconnecting-pc-board-spade-connectors.html akavalve: Disconnecting PC Board Spade Connectors PC board spade connectors can be difficult to pull off gently. Here's how I do it when there's enough room to get pliers in there. The board... pc board disconnecting spade connectors https://akavalve.blogspot.com/2009/01/discharging-filter-caps-basics-pt-2.html akavalve: Discharging Filter Caps - The Basics Pt 2 Here's hows how a discharge probe is used to bleed voltage off of a capacitor. This cap is completely removed from the circuit for illustra... the basics discharging filter caps pt https://akavalve.blogspot.com/2008/12/champion-600-12dw7-ecc832-mod-part-2.html akavalve: Fender Champion 600 12DW7 / ECC832 Mod Part 2 Here's a look at the 12DW7 / ECC832 tube I used in the Champion 600 12DW7 Mod Part 1 . Starting with the pin out diagram: You can see from ... fender champion mod part https://akavalve.blogspot.com/2008/12/opening-fender-champion-600-for-modding.html akavalve: Opening a Fender Champion 600 for modding Getting ready to make some circuit changes to this little Champion 600. The gif is just for fun really. If anyone is interested in more deta... opening fender champion modding https://akavalve.blogspot.com/2009/07/how-to-fit-weber-alnico-speaker-in.html akavalve: How to fit a Weber alnico speaker into a Champion 600 with a JJ 6V6 The original owner of this Champion 600 decided to move to a larger amp . I'd put so much time into the mods that I decided to buy it from ...