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#1
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ampeg security screws & transformer.
where can I get a tool to remove the cab screws for an ampeg b-15. The
head is recessed with a shape that is like an oval with sides squeezed in. Also, removed all the tubes and it still blows fuses. My diagnosis is something wrong with power xformer. Am I correct? Primary DC resistance is 3 ohms. Where can I get another transformer? Thanks |
#2
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On Sat, 14 May 2005 12:17:40 -0400, crevitch wrote:
where can I get a tool to remove the cab screws for an ampeg b-15. The head is recessed with a shape that is like an oval with sides squeezed in. I doute you'll find one... get an old screwdriver and file the center out of it... Also, removed all the tubes and it still blows fuses. My diagnosis is something wrong with power xformer. Am I correct? no... Primary DC resistance is 3 ohms. 3 ohms is about right... Where can I get another transformer? you need some caps or diodes and a tech, not a transformer. Thanks You're welcome... |
#3
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try an autoparts store, sounds like the screw GM started using.
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#4
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crevitch wrote: where can I get a tool to remove the cab screws for an ampeg b-15. The head is recessed with a shape that is like an oval with sides squeezed in. Probably any hardware store. That's called a "clutch-head" screwdriver. I'd suggest buying it as a bit; chuck it into a 3/8" variable-speed reversing drill. Also, removed all the tubes and it still blows fuses. My diagnosis is something wrong with power xformer. Am I correct? No. LV |
#5
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Hi. manage to remove at least one screw with a dulled-out flatblade or
whatever. Take the victim to a friendly auto parts supply store and show it to the friendly clerk for the tool. Sorry I cannot dismember the technical term for the tool. But this has worked well for me twice in the last 25 years. Next to the transformer, once you have cracked the chassis open, a more effective way to isolate the fuse-blowing culprit rather than yanking tubes is to unsolder all the wires of the secondary. Then see if it still blows the fuse. If so, the transformer is guilty as charged probably. Measuring DC resistance is practically useless endeavor as a shorted winding may only result in a change of less than .1 ohm. A shorted winding on the secondary will result of pulling infinite current from the primary. Check your physics textbooks if you dont believe it. infinite current is highly suspect of blowing fuses, much more likely than queer electrons. Replacement available from Ampeg as they have reissued this model. Cannot disremember if the reissue uses tube or solid-state B++ rectifier but one can always adjust to the situation where can I get a tool to remove the cab screws for an ampeg b-15. The head is recessed with a shape that is like an oval with sides squeezed in. Also, removed all the tubes and it still blows fuses. My diagnosis is something wrong with power xformer. Am I correct? Primary DC resistance is 3 ohms. Where can I get another transformer? Thanks |
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