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<channel><title><![CDATA[COMMONWEALTH PRO AUDIO, LLC - Repair Stories and Tech Tips]]></title><link><![CDATA[https://www.commonwealthproaudio.com/repair-stories-and-tech-tips]]></link><description><![CDATA[Repair Stories and Tech Tips]]></description><pubDate>Tue, 09 Jun 2026 08:18:24 -0700</pubDate><generator>Weebly</generator><item><title><![CDATA[NEW WORKBENCH!!]]></title><link><![CDATA[https://www.commonwealthproaudio.com/repair-stories-and-tech-tips/new-workbench]]></link><comments><![CDATA[https://www.commonwealthproaudio.com/repair-stories-and-tech-tips/new-workbench#comments]]></comments><pubDate>Wed, 11 Nov 2020 20:20:35 GMT</pubDate><category><![CDATA[Technician Tips]]></category><guid isPermaLink="false">https://www.commonwealthproaudio.com/repair-stories-and-tech-tips/new-workbench</guid><description><![CDATA[I'm a terrible woodworker and always have been, but I bought a butcher block workbench and refinished it for Commonwealth Pro Audio. I'm proud of the work even though it's pretty damn amateur.It's an excellent, functional bench. I can tell that my efficiency has gone way up, my back hurts less, and I drop a tenth of the amount of stuff I used to on the floor. Enjoy this process album!         This is the finished bench! Thanks to Wingo who was kind enough to help me get the bench from my garage  [...] ]]></description><content:encoded><![CDATA[<div class="paragraph" style="text-align:left;">I'm a terrible woodworker and always have been, but I bought a butcher block workbench and refinished it for Commonwealth Pro Audio. I'm proud of the work even though it's pretty damn amateur.<br />It's an excellent, functional bench. I can tell that my efficiency has gone way up, my back hurts less, and I drop a tenth of the amount of stuff I used to on the floor. Enjoy this process album!</div>  <div><div class="wsite-image wsite-image-border-none " style="padding-top:10px;padding-bottom:10px;margin-left:0;margin-right:0;text-align:center"> <a> <img src="https://www.commonwealthproaudio.com/uploads/1/2/7/4/127406636/5a9ba6e6-9627-4568-bf7d-5ee64de55dfe_orig.jpeg" alt="Picture" style="width:auto;max-width:100%" /> </a> <div style="display:block;font-size:90%"></div> </div></div>  <div class="paragraph" style="text-align:left;"><font color="#050505">This is the finished bench! Thanks to Wingo who was kind enough to help me get the bench from my garage to the workshop, and he helped me assemble and level it.&nbsp;</font><br /><br /><span style="color:rgb(5, 5, 5)">I put three coats of oil based polyurethane on the bench.</span></div>  <div class="wsite-spacer" style="height:50px;"></div>  <div><div class="wsite-image wsite-image-border-none " style="padding-top:10px;padding-bottom:10px;margin-left:0;margin-right:0;text-align:center"> <a> <img src="https://www.commonwealthproaudio.com/uploads/1/2/7/4/127406636/f0389bfb-1568-4c8b-88fe-a51b189e159d_orig.jpeg" alt="Picture" style="width:auto;max-width:100%" /> </a> <div style="display:block;font-size:90%"></div> </div></div>  <div class="paragraph" style="text-align:left;">This is my old "workbench." It's a cheap writing desk that I bought from Target years ago. It's now a staging area off to the side for the next pieces to be worked on and for units that have parts on order.&nbsp;</div>  <div class="wsite-spacer" style="height:50px;"></div>  <div><div class="wsite-image wsite-image-border-none " style="padding-top:10px;padding-bottom:10px;margin-left:0;margin-right:0;text-align:center"> <a> <img src="https://www.commonwealthproaudio.com/uploads/1/2/7/4/127406636/3-u5wp5p9_orig.jpg" alt="Picture" style="width:auto;max-width:100%" /> </a> <div style="display:block;font-size:90%"></div> </div></div>  <div class="paragraph" style="text-align:left;"><span style="color:rgb(5, 5, 5)">This was the main photo in the Facebook Marketplace ad the guy who sold it to me put up.</span></div>  <div class="wsite-spacer" style="height:50px;"></div>  <div><div class="wsite-image wsite-image-border-none " style="padding-top:10px;padding-bottom:10px;margin-left:0;margin-right:0;text-align:center"> <a> <img src="https://www.commonwealthproaudio.com/uploads/1/2/7/4/127406636/e131795e-662b-4b48-8465-0f90e30c4819_orig.png" alt="Picture" style="width:auto;max-width:100%" /> </a> <div style="display:block;font-size:90%"></div> </div></div>  <div class="paragraph" style="text-align:left;"><font color="#050505">The original owner of the bench majorly abused it when working on his truck engine. This had to be sanded down to get the stain almost out. It's still just&nbsp;<span style="caret-color: rgb(5, 5, 5);">barely</span>&nbsp;visible if you&nbsp;know where to look.</font></div>  <div class="wsite-spacer" style="height:50px;"></div>  <div><div class="wsite-image wsite-image-border-none " style="padding-top:10px;padding-bottom:10px;margin-left:0;margin-right:0;text-align:center"> <a> <img src="https://www.commonwealthproaudio.com/uploads/1/2/7/4/127406636/fe852b86-107b-497d-93ec-c65dd2a7ec14_orig.jpeg" alt="Picture" style="width:auto;max-width:100%" /> </a> <div style="display:block;font-size:90%"></div> </div></div>  <div class="paragraph" style="text-align:left;"><span style="color:rgb(5, 5, 5)">I had to make a sawhorse out of scrap wood for this project. I'm a terrible woodworker - always have been. The green tint is from the garage overhead light.</span></div>  <div class="wsite-spacer" style="height:50px;"></div>  <div><div class="wsite-image wsite-image-border-none " style="padding-top:10px;padding-bottom:10px;margin-left:0;margin-right:0;text-align:center"> <a> <img src="https://www.commonwealthproaudio.com/uploads/1/2/7/4/127406636/85f0e294-7faa-4c86-80b9-71c37447f018_orig.jpeg" alt="Picture" style="width:auto;max-width:100%" /> </a> <div style="display:block;font-size:90%"></div> </div></div>  <div class="paragraph"><span style="color:rgb(5, 5, 5)">Preparing to palm sand the bench for the first time.</span></div>  <div class="wsite-spacer" style="height:50px;"></div>  <div><div class="wsite-image wsite-image-border-none " style="padding-top:10px;padding-bottom:10px;margin-left:0;margin-right:0;text-align:center"> <a> <img src="https://www.commonwealthproaudio.com/uploads/1/2/7/4/127406636/7-rcseyil_orig.jpg" alt="Picture" style="width:auto;max-width:100%" /> </a> <div style="display:block;font-size:90%"></div> </div></div>  <div class="paragraph" style="text-align:left;"><span style="color:rgb(5, 5, 5)">I think this photo was taken after the first sanding. I went over the top with three different grits of sandpaper.</span></div>  <div class="wsite-spacer" style="height:50px;"></div>  <div><div class="wsite-image wsite-image-border-none " style="padding-top:10px;padding-bottom:10px;margin-left:0;margin-right:0;text-align:center"> <a> <img src="https://www.commonwealthproaudio.com/uploads/1/2/7/4/127406636/8-i42uqhy_orig.jpg" alt="Picture" style="width:auto;max-width:100%" /> </a> <div style="display:block;font-size:90%"></div> </div></div>  <div class="paragraph" style="text-align:left;"><span style="color:rgb(5, 5, 5)">Look at that! This was after the first coat of poly dried.</span></div>  <div class="wsite-spacer" style="height:50px;"></div>  <div><div class="wsite-image wsite-image-border-none " style="padding-top:10px;padding-bottom:10px;margin-left:0;margin-right:0;text-align:center"> <a> <img src="https://www.commonwealthproaudio.com/uploads/1/2/7/4/127406636/9-r2iwnrb_orig.jpg" alt="Picture" style="width:auto;max-width:100%" /> </a> <div style="display:block;font-size:90%"></div> </div></div>  <div class="paragraph" style="text-align:left;"><span style="color:rgb(5, 5, 5)">The bench had to be wet sanded between coats of polyurethane.</span></div>  <div class="wsite-spacer" style="height:50px;"></div>  <div><div class="wsite-image wsite-image-border-none " style="padding-top:10px;padding-bottom:10px;margin-left:0;margin-right:0;text-align:center"> <a> <img src="https://www.commonwealthproaudio.com/uploads/1/2/7/4/127406636/10-wpqlzpb_orig.jpg" alt="Picture" style="width:auto;max-width:100%" /> </a> <div style="display:block;font-size:90%"></div> </div></div>  <div class="paragraph" style="text-align:left;"><span style="color:rgb(5, 5, 5)">I think this is a shot of the second coat of poly after I had just applied it.</span></div>  <div class="wsite-spacer" style="height:50px;"></div>  <div><div class="wsite-image wsite-image-border-none " style="padding-top:10px;padding-bottom:10px;margin-left:0;margin-right:0;text-align:center"> <a> <img src="https://www.commonwealthproaudio.com/uploads/1/2/7/4/127406636/11-eoxqxqv_orig.jpg" alt="Picture" style="width:auto;max-width:100%" /> </a> <div style="display:block;font-size:90%"></div> </div></div>  <div class="paragraph" style="text-align:left;"><span style="color:rgb(5, 5, 5)">Not sure where this was in the process - sometime after the second coat had dried. Perhaps this is after the third coat dried before polishing.</span></div>  <div class="wsite-spacer" style="height:50px;"></div>  <div><div class="wsite-image wsite-image-border-none " style="padding-top:10px;padding-bottom:10px;margin-left:0;margin-right:0;text-align:center"> <a> <img src="https://www.commonwealthproaudio.com/uploads/1/2/7/4/127406636/12-eokgrjz_orig.jpg" alt="Picture" style="width:auto;max-width:100%" /> </a> <div style="display:block;font-size:90%"></div> </div></div>  <div class="paragraph" style="text-align:left;"><span style="color:rgb(5, 5, 5)">This was after polishing the third and final coat with Novus polish and waxing with a paste wax.</span></div>  <div class="wsite-spacer" style="height:50px;"></div>  <div><div class="wsite-image wsite-image-border-none " style="padding-top:10px;padding-bottom:10px;margin-left:0;margin-right:0;text-align:center"> <a> <img src="https://www.commonwealthproaudio.com/uploads/1/2/7/4/127406636/ea110deb-c9ed-4349-9e03-e3cd660aba33_orig.jpeg" alt="Picture" style="width:auto;max-width:100%" /> </a> <div style="display:block;font-size:90%"></div> </div></div>  <div class="paragraph" style="text-align:left;"><font color="#050505">My tool boxes are still on the floor, but I'm working on a solution for that. At the moment, there is so much room on the bench that I can leave out every single tool I've used during a repair.</font><br /><br /><font color="#050505">You can see the old bench in&nbsp;<span style="caret-color: rgb(5, 5, 5);">the</span>&nbsp;bottom left corner of&nbsp;this photo. It has a Mackie mixer on it.</font><br /></div>  <div class="wsite-spacer" style="height:50px;"></div>  <div><div class="wsite-image wsite-image-border-none " style="padding-top:10px;padding-bottom:10px;margin-left:0;margin-right:0;text-align:center"> <a> <img src="https://www.commonwealthproaudio.com/uploads/1/2/7/4/127406636/e928cfdf-f97b-4bd7-a83c-aabc399c191a_orig.jpeg" alt="Picture" style="width:auto;max-width:100%" /> </a> <div style="display:block;font-size:90%"></div> </div></div>  <div class="paragraph" style="text-align:left;"><span style="color:rgb(5, 5, 5)">I had this wire rack on the floor originally. It wasn't ideal. I'm trying it out on the bench top. I've got the chemicals I need most often, drill, solder pump, cables, etc. on it. I found an old paper towel holder under the sink in the house and attached it. The whole rack is on felt pads and can be moved if need be.&nbsp;</span><br /><br /><span style="color:rgb(5, 5, 5)">I was able to move my light bulb limiter on top of the bench.</span><br /><br /><span style="color:rgb(5, 5, 5)">My iron is on cardboard to protect the bench top - a trick I learned when I worked in manufacturing at Pipehorn. Solder drips and what not collect on it and when it gets too bad you just change it out. It also means I can slide the whole setup closer or farther from me.&nbsp;</span><br /><br /><span style="color:rgb(5, 5, 5)">The switch labeled off and on on the corner of the bench is for audio going to the powered speaker on the floor. It allows me to hot swap when checking outputs on mixers and such without having to do anything beyond pushing a button. The default input to the switch is a long cable that connects to my phone so I can listen to music and podcasts while I work.</span><br /><br /><span style="color:rgb(5, 5, 5)">The powered speaker on the floor is an EV ZLX12P. I'm running the two channels (R &amp; L from the switch) at 12 o clock and the master volume at -6db (master has a range of -10 to +10db).</span></div>  <div class="wsite-spacer" style="height:50px;"></div>  <div><div class="wsite-image wsite-image-border-none " style="padding-top:10px;padding-bottom:10px;margin-left:0;margin-right:0;text-align:center"> <a> <img src="https://www.commonwealthproaudio.com/uploads/1/2/7/4/127406636/16b64115-f41b-4d1d-8040-6548300edbf9_orig.jpeg" alt="Picture" style="width:auto;max-width:100%" /> </a> <div style="display:block;font-size:90%"></div> </div></div>  <div class="paragraph" style="text-align:left;"><font color="#050505">I had some 8 ohm passive wedges for sale. I decided to use one as a test speaker until they sold. It was looking like no one was interested in them. They sold the day after I took this photo.<br />&#8203;</font><br /><font color="#050505">I put foam over the wedge to knock some of the volume down so I could run amps at higher volumes. The green cable&nbsp;<span style="caret-color: rgb(5, 5, 5);">that's</span>&nbsp;fed through the bench leg is a speaker cable that feeds the wedge.</font></div>  <div class="wsite-spacer" style="height:50px;"></div>  <div><div class="wsite-image wsite-image-border-none " style="padding-top:10px;padding-bottom:10px;margin-left:0;margin-right:0;text-align:center"> <a> <img src="https://www.commonwealthproaudio.com/uploads/1/2/7/4/127406636/bb20d96c-fc9f-4b04-b07e-a45787625600_orig.jpeg" alt="Picture" style="width:auto;max-width:100%" /> </a> <div style="display:block;font-size:90%"></div> </div></div>  <div class="paragraph" style="text-align:left;"><span style="color:rgb(5, 5, 5)">This bench is the right height for my new chair. The two fans are for moving solder fumes away from my face. My meter stays to my left. My battery charger for my Bosch drill has a temporary home in the back, left corner.</span></div>  <div class="wsite-spacer" style="height:50px;"></div>  <div><div class="wsite-image wsite-image-border-none " style="padding-top:10px;padding-bottom:10px;margin-left:0;margin-right:0;text-align:center"> <a> <img src="https://www.commonwealthproaudio.com/uploads/1/2/7/4/127406636/a6e7f368-5a4f-4515-8e7f-e51297aa769a_orig.jpeg" alt="Picture" style="width:auto;max-width:100%" /> </a> <div style="display:block;font-size:90%"></div> </div></div>  <div class="paragraph" style="text-align:left;"><span style="color:rgb(5, 5, 5)">My shop vac is temporarily on top of my filing cabinet (with schematics and service manuals in it). I'm going to order a longer hose and likely move it under the bench.&nbsp;</span><br /><br /><span style="color:rgb(5, 5, 5)">The cable hanging from the bench leg runs around behind the bench and to the input on the audio switch. The bench has power strips on both sides that are all ran from the same circuit.</span><br /><br /><span style="color:rgb(5, 5, 5)">The wood blocks make the bench perfectly level. My workshop is in the basement of my home. As such, the floor slopes gently toward a drain.</span></div>  <div class="wsite-spacer" style="height:50px;"></div>]]></content:encoded></item><item><title><![CDATA[1973 fender twin reverb partial restoration]]></title><link><![CDATA[https://www.commonwealthproaudio.com/repair-stories-and-tech-tips/1973-fender-twin-reverb-partial-restoration]]></link><comments><![CDATA[https://www.commonwealthproaudio.com/repair-stories-and-tech-tips/1973-fender-twin-reverb-partial-restoration#comments]]></comments><pubDate>Wed, 02 Sep 2020 16:29:42 GMT</pubDate><category><![CDATA[Completed Tube Repairs]]></category><guid isPermaLink="false">https://www.commonwealthproaudio.com/repair-stories-and-tech-tips/1973-fender-twin-reverb-partial-restoration</guid><description><![CDATA[Here's a '73 Twin Reverb we bought to restore to glory.It had a ton of issues that we addressed: - cut off power cord - mismatched and missing tubes (power and preamp) - shredded pots - blown speakers - out of tolerance grid resistors.Watch on YouTube for&nbsp;time&nbsp;stamps. Enjoy!        [...] ]]></description><content:encoded><![CDATA[<div class="paragraph" style="text-align:left;"><font color="#030303">Here's a '73 Twin Reverb we bought to restore to glory.</font><br /><br /><font color="#030303">It had a ton of issues that we addressed: - cut off power cord - mismatched and missing tubes (power and preamp) - shredded pots - blown speakers - out of tolerance grid resistors.</font><br /><br /><font color="#030303">Watch on YouTube for&nbsp;<span style="caret-color: rgb(3, 3, 3);">time</span>&nbsp;stamps. Enjoy!</font><br /></div>  <div class="wsite-youtube" style="margin-bottom:10px;margin-top:10px;"><div class="wsite-youtube-wrapper wsite-youtube-size-auto wsite-youtube-align-center"> <div class="wsite-youtube-container">  <iframe src="//www.youtube.com/embed/dM7RMPEqNQc?wmode=opaque" frameborder="0" allowfullscreen></iframe> </div> </div></div>]]></content:encoded></item></channel></rss>