J5Mk1 chassis mod

catoclepa

Hi,
I am almost ready Starting with the construction of J5Mk1.
Since I want to build a cabinet like the old fender tweed style , I designed a new chassis Smaller than the original project:I read the warnings in the pages of J5Mk1 faq And I do not want to have the problems that have been reported like squealing and oscillations .
I sent a copy of my draft : Thanks to all who give me tips

eBernd

Hi,

I build my J5 in a HAMMOND-Chassis (#1444-26 406 x 204 x 51 mm) and it works. But you intend to do it in a much more smaller Chassis and PT and OT are standing very close to each other and near to V1 (if your drawing is not misinterpreted by me). That will guarantee hum and other problems!!!

If you want to shrink your amp you have to understand the construction principles well and apply them.

Just study some of the classical Fender chassis layouts. That will show you a lot.

Bernd

catoclepa

Harrrggggg

I am a real idiot!
I was so excited to the idea of building a new apli ....I totally ignored The most obvious rules like place the V1 as far as possible from Trans !
Thanks for giving "awakened" .
I am already working on the new layout : just ready i will post it on the forum...

Thank's

catoclepa

new layout

what do you think abaut this chassis?

eBernd

Hi,

that's much better. But positioning of PT and OT has to be found out by experiment. I think you can't do that only on the paper.
The next challenge will be the right wiring of it all...
Good luck.

Bernd

master-lu

Hi,

does your layout work? I'd like to build the J5Mk1 in a smaller chassis, too. The 30er-Hammond is too big for small combos....

catoclepa

Hi,
I have not yet built J5Mk1.I designed the chassis because I would like to build a small combo.I designed this chassis comparing it with those of other amp ( like old fender weed ) .
I will Begin construction as soon as I finished the draft of the cabinet that will be very similar to that of fender Tweed Deluxe.
Ciao From Italy

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