Manley Jumbo Shrimp upgrade


Would like to keep and upgrade my current Manley Jumbo Shrimp preamplifier.  Does anyone know of a competent tech who can accomplish this.  Considering $700-1000 worth of upgrades.  Thanks for input.

celtic66
wolf_garcia
2,660 posts
10-27-2016 1:49pm
Fuse directionality in AC circuits is technically irrelevant, and perceived changes in sound from reversing a fuse are likely imagined. Some think changing the direction meant you cleaned the fuse contacts and are hearing the results of that, but if the fuse worked before being reversed that’s also very unlikely, although cleaning any contacts is generally a good idea. Like washing your hands after meeting a politician.

There are many perfectly good reasons why some people have bad results with some tweaks. Historically it has happened for everything from the Tice Clock to Mpingo disc to expensive cables, silver holographic foil, the Intelligent Chip, the VPI brick and many other controversial things, like fuses. If you like I’ll list the reasons. I’ll give you a hint. One of them is that the person is so committed to his belief that the thing can’t possibly work he has psyched himself out. But just going by the testimony I read on the fuse threads on this forum alone, not even counting all the discussions on fuse directionality on other forums, the positive results outweigh the negative ones by, what, gotta be 20 to 1. The reasonable thing to do, it seems to me, would be to throw away the negative results as outliers.
Gbmcleod,
As you well know this fuse topic has been covered numerous times on this and other open discussion forums. As geofkait noted the ratio is usually quite high in favor of listeners with a positive response. I do believe that some people can have such a negative bias and expectation of "no difference heard" that they’d never admit to any sonic improvement. Bias can and does work in both directions. I’ve heard fuses make a + difference in various systems and multiple components over the years. I remember very similar debates regarding power cables in the past, not so much anymore. My well meaning suggestion to celtic 66 is hey, just give them a try and see what you think.
Charles,
The "positive results" mentioned have been somewhat skewed by the relentless commercial promotion of SR fuses by a few very motivated posters, who by themselves make up a large percentage of the "testimony" in the primary SR fuse thread. When I posted the simple question asking if anybody had a reasonable explanation of why these fuses work (the Athletic Supporters of SR stuff seemed likely to know the answer), it became clear there was simply nobody who has a clue about why Quantum Tunnelling or Graphene dust in a fuse would make any difference. My tests showed it doesn't, but then I didn't pay anything for my test samples.
The Wolf Man wrote,

(I don’t see why) Graphene dust in a fuse would make any difference.

Wolfie, maybe it’s because the Graphene is not in the fuse.

I'd suggest finding the competent tech sought after and ask them what to do.  Ask about a fuse upgrade and see what they say.