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McIntosh MAC-1500
Is anyone familiar with the McIntosh MAC-1500, a mid-1960's hybrid receiver, from a technical point of view? I'm trying to determine the value of two burned resistors in the power supply, and no schematic covers it.
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#2
Posted to rec.audio.tubes
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McIntosh MAC-1500
On Dec 23, 2:20*pm, iluvtubes
wrote: Is anyone familiar with the McIntosh MAC-1500, a mid-1960's hybrid receiver, from a technical point of view? I'm trying to determine the value of two burned resistors in the power supply, and no schematic covers it. Thanks! -- iluvtubes The schematic diagrams are posted on various websites. Free. |
#3
Posted to rec.audio.tubes
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McIntosh MAC-1500
On Dec 23, 7:20*pm, iluvtubes
wrote: Is anyone familiar with the McIntosh MAC-1500, a mid-1960's hybrid receiver, from a technical point of view? I'm trying to determine the value of two burned resistors in the power supply, and no schematic covers it. Thanks! -- iluvtubes http://www.berners.ch/McIntosh/Downl...AC1500_ser.pdf includes ps schematic afaics describe how yours differs, and someone may be able to help ian |
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#5
Posted to rec.audio.tubes
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McIntosh MAC-1500
On Dec 24, 12:06*pm, iluvtubes
wrote: ;949434 Wrote: On Dec 23, 2:20*pm, iluvtubes wrote:- Is anyone familiar with the McIntosh MAC-1500, a mid-1960's hybrid receiver, from a technical point of view? I'm trying to determine the value of two burned resistors in the power supply, and no schematic covers it. Thanks! -- iluvtubes- The schematic diagrams are posted on various websites. Free. Thank you! Yes, I do have a copy of the schematic you're referring to. But it only covers the early production models and does not reflect the changes made in later units. -- iluvtubes I would send an email to McIntosh. There is also a list of ECNs available at Pete Millett's site IIRC. It may have been a back change too. But don't replace the resistors until you figure out why they burned. They may have done what they were supposed to do, i.e., act as fuses. A subber power supply comes in handy here. |
#6
Posted to rec.audio.tubes
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McIntosh MAC-1500
"Ian Iveson" http://www.berners.ch/McIntosh/Downl...AC1500_ser.pdf includes ps schematic afaics ** Did you even look at the schems ? They are all completely illegible. .... Phil |
#7
Posted to rec.audio.tubes
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McIntosh MAC-1500
On Dec 24, 5:37*pm, "Phil Allison" wrote:
"Ian Iveson" http://www.berners.ch/McIntosh/Downl...AC1500_ser.pdf includes ps schematic afaics ** Did you even look at the schems ? * *They are all completely illegible. ... *Phil Try this one. http://www.tubebooks.org/file_downlo...ice_manual.pdf |
#8
Posted to rec.audio.tubes
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McIntosh MAC-1500
On Dec 26, 12:50*am, wrote:
On Dec 24, 5:37*pm, "Phil Allison" wrote: "Ian Iveson" http://www.berners.ch/McIntosh/Downl...AC1500_ser.pdf Hello Phil, merry christmas. Always nice to know you're still there, in Australia. ** Did you even look at the schems ? Not for long. Couldn't be bothered searching for the best example. Luke warm I know, but positive all the same. * *They are all completely illegible. Oh well. Just suggesting a different approach to asking the question. the probability of finding someone here who knows the resistor values, or has a set of the same vintage, is quite small. If the OP isn't able to discuss the details of the circuit, he won't get anywhere, probably. Perhaps he could sketch his circuit, and ask what's missing. Like a christmas quiz. It's been a while since we had one. *Try this one. http://www.tubebooks.org/file_downlo...0_service_manu... Thanks, Phil. Ian |
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#10
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In my first post, I might have overstated when I said "burned". Maybe more like discolored, or ran hot, to the point that the color bands have darkened somewhat. If I could just find pictures of another late model MAC-1500, that would solve everything. I came across one online, but unfortunately it was too blurry to make out the resistor values. But it also told me that mine is completely original and untouched, since it had the same resistor layout as mine. |
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