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Old 10th February 2003, 11:54 PM   #1
Hornboy is offline Hornboy  United States
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Default McIntosh MA6100

I've owned this integrated amp since new (28 years). It has never been touched and almost never used (in dry storage for ~15 years). A few folks have mentioned to me that the power supply caps (a pair of GE 9300 uF/50V) should be replaced with Black Gate FK 10000 uF /80V units (from a size perspective, an exact replacement).

I would be willing to try a range of capacitors. Other than the BGs, can anyone else recommend alternatives. The GE caps are 2" in diameter and 3" tall with screw lug connections.

TIA,
John
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Old 11th February 2003, 12:39 AM   #2
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Cornell Dubelier (ungood spelling) makes very nice
caps, some of which will drop in without complaint.

Not as exotic as Black Gates but not as expensive,
either, and with a good performance record.
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Old 11th February 2003, 10:01 AM   #3
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Default Re: McIntosh MA6100

Quote:
Originally posted by Hornboy
A few folks have mentioned to me that the power supply caps (a pair of GE 9300 uF/50V) should be replaced with Black Gate FK 10000 uF /80V units (from a size perspective, an exact replacement).

I would be willing to try a range of capacitors. Other than the BGs, can anyone else recommend alternatives. The GE caps are 2" in diameter and 3" tall with screw lug connections.
Panasonic TSHA might fill the bill too, except they are not screw lug types. On the other side a 15000/50v type, 105 degrees, is 35mm thick and 50mm high. Cost certainly more reasonable than BGs.

In fact it's strange how few people use these supply caps and so many like FCs for preamp supplies or local bypass.

Designing a pcb holding Schottky or Fred diodes using these caps should make an excellent supply.


Carlos
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Old 12th February 2003, 10:08 AM   #4
Hornboy is offline Hornboy  United States
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Is there a downside to replacing the original 9300uF/50V with 21000uF/75V?
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Old 12th February 2003, 12:25 PM   #5
massimo is offline massimo  Italy
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Be careful with aged rectifier diodes.
Also the transformer could suffer from excess surge current during start up if you increase the capacitance that much.

Eventually replace the rectifiers, but consider that very often "modern" diodes are much more efficient, thus the resulting DC voltage can exceed the design parameter.
Measure the DC "as is" and then turn on the amp with news diodes using a variac while monitoring the DC across the caps.

When I changed old diodes in my Mc tube Tuner (MR 71) I had to increase the first R in the CRC filter to compensate the extra voltage.
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Old 9th November 2005, 07:33 AM   #6
etcjkam is offline etcjkam  Hong Kong
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Does anyone have a MA6100 functionspecification including details such as input sensitivity and power output?

Thanks,
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Old 9th November 2005, 07:42 AM   #7
Netlist is offline Netlist  Belgium
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Here's what you are looking for.

/Hugo
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