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Before you touch anything inside the amp chassis, it’s imperative that these capacitors are discharged.If you are unsure of this procedure, consult your local amp tech.That’s probably a moot point, though—experience tells me that most original speakers in amps of that age are substantially fatigued and generally sound very weak. It's a great-sounding speaker, but with a sensitivity rating of 100 d B, it’s relatively efficient and would probably be pretty loud in that amp.Let’s take a look at a couple speakers from Warehouse Guitar Speakers (wgs4.com) so I can better explain this.Please note one (dating to 1971) has a repaired tear which has been professionally repaired... Excellent sound from these two and most suitable for your Marshall or custom 2x12 cabinet needs...
The most dangerous voltages are stored in electrolytic capacitors, even after the amp has been unplugged from the wall.You need a speaker with a lower audio output, so you should consider the spec known as SPL, or sound pressure level (sometimes called sensitivity).The SPL rating specifies how loud a speaker is at a distance of one meter when driven by one watt. I don’t know what speaker is in your amp, and even if I did, its specs might not be available.Whether it’s a vintage amp or a recent model such as this Fender Pro Reverb, hum can have several causes.
Possible culprits include the preamp tubes, the power tubes, the hum balance resistors, and the power supply caps.Pre-Rola as well as early era Rola G12M & G12H speakers in stock. Lead and Bass cones available, all in original 100% functional condition! This amp has been completely serviced and sounds stunning to say the least. Really beautiful NOS condition/sounding and super rare G12H 8Ω speakers available in pairs. All speakers function as they should and are considered last of the original Pulsonic cones before the 'RIC' cones became standard issue. a killer cab that serves up juicy plexi tones for days... This block logo Marshall JTM45 limited run 'long box' PA head sounds like everything you'd hope or expect from an RS powered JTM amp! Cab sounds warm & full with good highs and sweet midrange.