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Egnater / Randall Modular Amps
RM20B - Constantly Blowing External Fuse - PLEASE HELP!!
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<blockquote data-quote="Jaded Faith" data-source="post: 117455" data-attributes="member: 1068"><p>When your amp blows a fuse, it's trying to tell you something is wrong. If you don't locate and address why there is too much current flowing through the part of the circuit the fuse is intended to protect you will spend a lot of money on fuses only to watch them burn up.</p><p></p><p>The fuse you are blowing is the Mains fuse. The first thing to check is to make sure the voltage selector where the power cord plugs in as set properly for your line voltage. </p><p></p><p>You mentioned that you pulled the HT fuse (the 250mA one) and checked it for resistance. I'll assume you meant continuity? Or that the resistance reading was "0"? That's what you want to check there. You really need to rule this fuse out.</p><p></p><p>The HT fuse blowing would be indicative of either a shorted tube, power cap or transformer. If you are certain the HT fuse is good and it's only the Mains fuse blowing, that may be indicative of more serious problems that will require a tech. </p><p></p><p>Some last things to try in this order:</p><p></p><p>- Check the HT and mains fuse for continuity</p><p>- Replace all the tubes with fresh ones or known good ones. You should spray the pins of them with contact cleaner and gently work them in/out of the socket a few times to make sure they are not dirty.</p><p>- Set the Bias almost all the way down</p><p>- Power the amp on</p><p></p><p>Does it stay on? If so, bias it properly per the manual and enjoy the amp. It would appear a tube was bad and taking out your fuses.</p><p></p><p>Does it blow again? This is out of your hands and you need to take it to a pro.</p><p></p><p>Hope that helps,</p><p>Rob</p></blockquote><p></p>
[QUOTE="Jaded Faith, post: 117455, member: 1068"] When your amp blows a fuse, it's trying to tell you something is wrong. If you don't locate and address why there is too much current flowing through the part of the circuit the fuse is intended to protect you will spend a lot of money on fuses only to watch them burn up. The fuse you are blowing is the Mains fuse. The first thing to check is to make sure the voltage selector where the power cord plugs in as set properly for your line voltage. You mentioned that you pulled the HT fuse (the 250mA one) and checked it for resistance. I'll assume you meant continuity? Or that the resistance reading was "0"? That's what you want to check there. You really need to rule this fuse out. The HT fuse blowing would be indicative of either a shorted tube, power cap or transformer. If you are certain the HT fuse is good and it's only the Mains fuse blowing, that may be indicative of more serious problems that will require a tech. Some last things to try in this order: - Check the HT and mains fuse for continuity - Replace all the tubes with fresh ones or known good ones. You should spray the pins of them with contact cleaner and gently work them in/out of the socket a few times to make sure they are not dirty. - Set the Bias almost all the way down - Power the amp on Does it stay on? If so, bias it properly per the manual and enjoy the amp. It would appear a tube was bad and taking out your fuses. Does it blow again? This is out of your hands and you need to take it to a pro. Hope that helps, Rob [/QUOTE]
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Modular Amps
Egnater / Randall Modular Amps
RM20B - Constantly Blowing External Fuse - PLEASE HELP!!
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