Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => DIY Layout Creator and Custom Boards => Topic started by: CrasseDeMeule on September 03, 2025, 01:29:05 am

Title: Pro Junior Layout
Post by: CrasseDeMeule on September 03, 2025, 01:29:05 am

Hi all!!
Based on the Hoffman schematic, here is the DIYLC file for those who would like to use...
Many people use PDF, but many use now DIYLC now...

I also integrated a impedance switch mod.

Title: Re: Pro Junior Layout
Post by: EL34 on September 03, 2025, 04:33:52 am

Nice work
If you want, I will upload these to the .diy library?

Title: Re: Pro Junior Layout
Post by: CrasseDeMeule on September 03, 2025, 07:21:44 am

No problem!
But as a newbie, a quick check from an expert would be safer!
Around the PT, B+, and the choke, I'm not sure 100%

Also as I didn't receive the PT yet, I mybe haven't put the right colours

Title: Re: Pro Junior Layout
Post by: CrasseDeMeule on September 04, 2025, 02:09:36 am

Little corrections on the schematic,

Bridge rectifier added
A mistake corrected on the green wire from the cold point of the input jack
Rewiring of the 6.3V, more convenient like this

Title: Re: Pro Junior Layout
Post by: EL34 on September 04, 2025, 06:04:55 am

Just check against my layout
Use a sharpie to follow each trace on paper

https://el34world.com/Hoffman/files/Hoffman_Pro_Jr.pdf

Title: Re: Pro Junior Layout
Post by: CrasseDeMeule on September 04, 2025, 06:31:36 am

That's what I did, with this schem, and the more modern one that you uploaded as well.
Everything looks good to me now.