Threshold 800A amplifier versions

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Hi,
I noticed that some of the Threshold 800A amplifiers have two power-supply fuse holders on the back panel while others have four. Does anyone know if this is indicative of two different versions of the 800A? If so, which version was the later or newer, ie better? The different fuse count obviously does not include the two fuses at the output stage.

Perhaps Nelson himself could shime in with some insight into the differences between the two different versions of the back panel and how they transilate to any differences in the internal circuits if any.

Thanks,
Carlos
 
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