Welcome To the Hoffman Amplifiers Forum

September 07, 2025, 03:29:50 am
guest image
Welcome, Guest. Please login or register.
-User Name
-Password



Hoffman Amps Forum image Author Topic: Princeton Build Report  (Read 3978 times)

0 Members and 1 Guest are viewing this topic.

Offline humbug

  • Level 1
  • *
  • Posts: 13
  • I love Tube amps
Hoffman Amps Forum image
Princeton Build Report
« on: April 03, 2016, 10:20:51 am »
Last summer, I built my first amp: Doug's 5F2A Princeton. Now, I'm a little headstrong and decided to bend my own chassis from aluminum and design it with the chassis on the bottom of the box rather than on the top as in the original. I liked the idea of the tubes sitting upright rather than hanging down.

I had some old 7/8" cedar wood that I bought some time ago that I used for the box and learned how to do finger joints on this box (with home-made jig on my home-made router table). The result was typical of my work -- which is pure escapism and fun for me and never professional quality by any means. It was nice but had a few critical flaws. The worst flaw was that I used 6mm marine plywood for the speaker baffle covered with speaker cloth. It rattled at higher volume.

So the result is the final product in this picture. It's a nice amp and looks kind of retro I think.  :icon_biggrin:

P. S. I've been playing with pedals lately. The pedal in the picture is a Tube Screamer 808 clone I put in a hollowed out piece of black walnut I have had forever....

Offline Willabe

  • Global Moderator
  • Level 5
  • ******
  • Posts: 10524
Hoffman Amps Forum image
Re: Princeton Build Report
« Reply #1 on: April 03, 2016, 12:02:25 pm »
They both look great!   :bravo1:

Now that's a pedal! I LOVE the bumps on the side of it.  :icon_biggrin:

Can you post a pic of the back side of the amp too? (So we can see the chassis layout.)

Offline humbug

  • Level 1
  • *
  • Posts: 13
  • I love Tube amps
Hoffman Amps Forum image
Re: Princeton Build Report
« Reply #2 on: April 03, 2016, 05:14:35 pm »
Thank you! Much appreciated. As I said, my woodwork has flaws and I just do it for my own fun. Here's the back with 2 pics. I removed the upper back panel recently. It sounded "hollow" with it installed. It is kind of a big box for an 8 inch speaker....

The aluminum for the chassis was too heavy. Thinner alum would have worked much better and I could have gotten straighter sides and sharper corners. But it all works!

I'm including a couple pics of the pedal. The one on the left is one I'm doing for a friend and you can see the "innerds." The black paint inside is RF reflective paint that is used on the inside of a guitar to block interference. It works perfectly on these wooden pedals. The last pic shows the original piece of walnut with the "warts" on the outside of the bark. I just had to keep them on my pedal.  :icon_biggrin:

Best,

Steve

Offline HotBluePlates

  • Global Moderator
  • Level 5
  • ******
  • Posts: 13127
Hoffman Amps Forum image
Re: Princeton Build Report
« Reply #3 on: April 03, 2016, 06:25:16 pm »
Pretty build!! I really like the metal trim strips on the baffle board.

 


Choose a link from the
Hoffman Amplifiers parts catalog
Mobile Device
Catalog Link
Yard Sale
Discontinued
Misc. Hardware
What's New Board Building
 Parts
Amp trim
Handles
Lamps
Diodes
Hoffman Turret
 Boards
Channel
Switching
Resistors Fender Eyelet
 Boards
Screws/Nuts
Washers
Jacks/Plugs
Connectors
Misc Eyelet
Boards
Tools
Capacitors Custom Boards
Tubes
Valves
Pots
Knobs
Fuses/Cords Chassis
Tube
Sockets
Switches Wire
Cable


Handy Links
Tube Amp Library
Tube Amp
Schematics library
Design a custom Eyelet or
Turret Board
DIY Layout Creator
File analyzer program
DIY Layout Creator
File library
Transformer Wiring
Diagrams
Hoffmanamps
Facebook page
Hoffman Amplifiers
Discount Program


password