Reissue Deluxe On Board Fuses

[straycat]

The reissue Deluxe has two fuse holders located on the circuit board holding fuses labled as T4A L 250V. One is for the heater wires and the other is for the wires that run from the rectifier to the supply rail.

Are these 4 amp fuses ? Slow or fast acting?

[txstrat]

Usually the T stands for slo blow (like time lag or somethin')
In this case 4 amps

[straycat]

Here is the PDF file for the reissue. A 4 amp fuse seems high in this application.

[txstrat]

Nope. It protects the heater supply of the rectifier tube.
I suppose that'll be 2A of heater current and the 4A fuse is just right.

[straycat]

I have all the parts on the way to build a 5E3 in a head chassis and thought the extra insurance would be great. Also like the way they use the DPST power switch on both the hot and neutral AC lines. Just a little more safety.

[Enzo]

Both of those are heater fuses. One fuses the 6v tube heaters, and the other fuses the 5v rectifier tube heaeter. There is NOT a fuse between rectifier and B+ rail.

[Five_E35]

Regarding the power switch and AC wiring, check out the shielding they ended up with in those amps. In the news/press release section of the Mercury Magnetics site there's a couple of articles in PDF format you can download and supersize to get a good look at the guts. One is a Tonequest report, the other a VGReview. They have shielding around the input jacks and a big shield right next to the power switch and all that wiring. The standby ground wire takes the long way around all that wiring to get to the star ground. I wonder if they had problems with hum from all the quick connects, etc.

[straycat]

This 5E3 build will be my fourth amp build. I am still a rookie at building amps although my last build was a Marshall 50 watt plexi. I am starting to think from these replies that I should keep it simple and follow the original layout .

Thanks for all the replies I appreciate all of them!!

[Five_E35]

This 5E3 build will be my fourth amp build. I am still a rookie at building amps although my last build was a Marshall 50 watt plexi. I am starting to think from these replies that I should keep it simple and follow the original layout .

Thanks for all the replies I appreciate all of them!!

I used the board to sockets and board to jacks/pots lead dress from the '57RI Schematic and it worked out just fine. It's slightly different than from the public domain version for the power tubes and pots. I experimented with grounds and ended up doing it like the RI as well with everything to the negative junction of the first cap/cathode resistor and from there to the brass plate. Bruce and some others here recommend that way as well.

For the heater line and the wiring on the 'other' side I downloaded a good pic of the inside of a Victoria Double Deluxe someone posted on another forum and super-sized it with Photoshop. Unlike the '57RI, they keep it pretty neat and straightforward and that worked out fine too.

There's also a picture of the inside of a real '58 Deluxe on the Ampwares section of the Mojo site.

[Enzo]

Hum from all the disconects? No, I'd say they designed it all that way to prevent hum in the first place.

When the Deluxe first came out, there would have been few flourescent lights in mot basements, not very many computers on nearby desks, no CD players throwing digital fields around, etc. Nowdays shielding the input circuit is more important than ever.