Sunfire EQ Subwoofer Amplifier REPAIR KIT Power Supply Hum

Description: This set of low voltage capacitors seeks to address a common issue with Sunfire Subwoofer amplifiers. Unlike my other kits for three other versions of Sunfire subwoofers, this kit is new and is still being developed. Unlike the HRS, True, Architectural and Junior models, I have not worked on the EQ model. This kit is being developed in response to requests by EQ owners for a kit. Four 1000 uF capacitors in the power supply are vulnerable and are replaced with upgraded Panasonic low-ESR versions (C1A, C65, C148, and C170). This may be all that is required to address a hum. Not as likely to fail and not as easy to replace are two 47 uF high voltage capacitors (C39 and C73), and upgrade replacements are included. On that same board two 470 uF capacitors can be replaced (C41, C62). On a daughterboard two 220 uF capacitors may be replaced/upgraded (C143). I recognize that Sunfire carried over use of some vulnerable capacitors from the earlier True series to the EQ, and have included upgraded Panasonic low-ESR type FR capacitors to replace them. Typically I also increase the voltage rating, where practical. As buyers share results and suggestions how to improve this kit, I will modify this listing to provide more help, photos, identification numbers and possibly more components. Four cautions: 1). Most importantly, observe proper safety precautions. These amplifiers store dangerous voltages in two 200 volt capacitors and in circuits connected to them, even after the amplifier has been unplugged for days. Handling circuits that can still hold high voltage is not something a novice should attempt. I always discharge those capacitors through a resistor before beginning work. 2) While these capacitors address a problem so common that I would address it automatically with every one of these amplifiers as a starting point, there could be additional problems beyond what this kit addresses. Using this kit does not assure that your amplifier will be repaired. 3) Desoldering and soldering is required for installation. Be careful not to press on the copper trace or pad when desoldering, nor overheat it, or it may lift. If that happens, note where the trace on the top side of the board connects, so that you can be sure you have correct continuity with the new component. Using a jumper may be necessary. Double-check your work. 4) Be sure to observe correct polarity with the diodes and capacitors. Each component needs to be oriented facing the correct direction (+ and -). Condition is "New". Anecdotal Evidence: Individual reports are no guarantees of universal results, but with electronics if numerous examples see the same problems and solutions, cumulative results become very useful. As of May 2024, I can report my first response from an EQ owner to whom I recommended replacing four 1000 uF capacitors (which are included in this kit), "I did replace the 4 capasitors [sic] and all the hum was gone! No other replacement was needed."

Price: 22.25 USD

Location: New Prague, Minnesota

End Time: 2024-11-21T06:37:13.000Z

Shipping Cost: N/A USD