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Musical Instrument Repair Community

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Missing resistor consequences

Hi, I recently got a soldano hot rod in a trade (what a score) buuuuuuut when I met up with the dusty ol fellow in a 7-11 carpark he mentioned that it sounded like a screw was loose and rolling around in the chassis, so I got her home popped her open and to my dismay it was a resistor (placed in series right before one of the power tubes) that has fallen off the PCB, I’m handy with the soldering iron so I’ve got no bones about attaching it back on, but I’m worried about potential damage in the rest of the circuit, I’ve got no idea how long this has been an issue for or how the amp even survived on 1 power tube

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Shy Swartz
Shy Swartz
6 days ago

Wow! that is crazy! sorry to hear about your situation! what i would recommend is purchasing and installing a new resistor then testing the amp. if you dont experience any issues with the amp then i would roll with it. If you do experience any issues definitely send a update and ill help you troubleshoot further. Below i have linked the exact resistor you need just make sure you select 470! Hope this helps! https://www.tubedepot.com/products/2-watt-metal-oxide-power-resistor

Digico S21 fader clean

Any thoughts on this? There’s a lot of useless advice about!! There is a serious lack of skilled repair technicians in Uk, I’m a sound engineer and theatre tech, and often don’t have time to spend as long learning to repair as I’d like to, but here for it! I have a pile of pro gear to work through 😂

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Shy Swartz
December 7, 2025 · updated the description of the group.

Welcome to the community! You can connect with other members, ask questions, share recommendations, story's, current projects or repairs you are working on! Below we have laid out some ground rules for the group! We hope you enjoy! ❤️


Community rules and guidelines:


-Be respectful to each other, civil disagreement or debate is fine. Name calling, bullying, hatefulness, harassment, or bigotry of any form is not acceptable. If you engage in this behavior you will be removed from the group.


-Do not share content that is not related to musical instrument repair, you are more than welcome to share photos of your repairs or projects, ask questions, share helpful tips and tricks ext. If you share content that is not related to instrument repair your content will be removed and you will be given a friendly reminder of this rule, if you break the rule again you will be removed from the group.


-Do not spam the group, you are more than welcome to communicate freely and frequently with the other members in the group, but if you keep sending/posting the same message over and over and over and over, one right after another , you will be asked to stop, if you refuse you will be removed from the group.


-Have fun! The goal of this group is to have fun and positive space for all of you to connect! Now that you guys know the rules, all that I ask is you enjoy your time here in the group!


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