London Power 3 channels amplifier project

[Vostre Roy]

Hi Vostre

The thing that catches my eye is the power switch right beside the input jack. These are normally as far apart as possible. One solution is to put the switch on the rear panel.

On the rear panel, I would swap the Send and Return s the signal flow on the rear is from right to left.

Power flow is opposite to signal flow, so the mains input should be on the other end, too, which really begs for the OT and PT to swap chassis ends, along with the PSU remaining under the PT. Overall, I would do this:

On the front, Input to left end as is with the selector switch above it.
OD channel below Clean channel.
To the right of this, PA stuff below Lead channel
PA stuff could include the mains switch as far right as possible

On the rear, Mains moved to opposite end
FX send/return swapped
foot switch jack on rear panel

External fuses? What are these for?

PSU has the mains fuses onboard. It is useful to add an OT fuse that is a fast-blow (mains are slow-blow), but none of these should be externally accessible.

The channel LEDs can do double duty as a power indicator, since one or another channel will always be selected. However, if you add now or later additional fusing for isolating the PSU or various circuits, a discrete power LED could be useful. Personally, I like to have a power LED right beside the mains switch as it is intuitive and expected.

You are obviously very good with autocad

Thanks for the reply Mr O'Connor, very appreciated!

I've worked on the layout a little today but I'll complete it tomorrow during my lunchtime (I'm using my work computer to do this so I've got to do it during my personal time ahah). I was kind of expecting that putting the power switch right next to the input might be problematic, I will put them on each end of the front panel to distance them as much as possible. I don't want it to be on the back panel, I've done it on my Ceriatone and I totally hate it, hard to reach when the amp is in my music room.

I shall post the modification tomorrow for a second review, my goal is to have the layout completed so I can print it on here before I go back at home (printer here can handle 11x17 paper size, which is perfect for the chassis)

Oh and thank for the compliment regarding AutoCAD, I'm using it everyday to draw mining stuff, still learnt to use it for some personal projects (guitars, cabs and amps). Ain't as useful as proper electronical knowledge, but at least it can has some uses for my hobbies ahah

Cheers!