Ultra-high performance low-buck phono preamp (DIY project!)

Got me some RCA wye connectors so I could add the speakers from the Bradford system downstairs!

Rockin’!
 
So, the original aluminum face plate had two knobs on it originally (volume and selector). I'm only using one, but there is a large counterbore like the one I am using, under the copper. So I made a "washer" to make up the difference and keep the bushing aligned etc.

IMG_4184.JPGIMG_4185.JPG

Then I got the engraving filled with appliance epoxy spray paint. It's great stuff but takes a week to fully cure (or be topcoated). So, I think I may have to wait the week because the copper will tarnish within a week, and then not look as nice. But I'll probably work on polishing the chamfers in the meantime.

IMG_4186.JPGIMG_4187.JPGIMG_4188.JPGIMG_4189.JPG
 
J!m said:
So, the original aluminum face plate had two knobs on it originally (volume and selector). I'm only using one, but there is a large counterbore like the one I am using, under the copper. So I made a "washer" to make up the difference and keep the bushing aligned etc.

View attachment 60498View attachment 60499

Then I got the engraving filled with appliance epoxy spray paint. It's great stuff but takes a week to fully cure (or be topcoated). So, I think I may have to wait the week because the copper will tarnish within a week, and then not look as nice. But I'll probably work on polishing the chamfers in the meantime.

View attachment 60500View attachment 60501View attachment 60502View attachment 60503
Click to expand...
How are you planning on removing the excess paint?
 
That's for the headphone amp, but I wanted to test "small" before I went for it.

The good news is that (so far) the lacquer is not pulling the paint off the copper...
 
Thanks!

I just designed it. There are great machine shops all over the area. This guy does cash deals with me. Not cheap, but cheapER.

I have access to a couple lathes but the mills are barely suitable as drill presses. Wasted ways on them and I’m the only person that ever oils the heads. Junk.
 
J!m said:
And, done. Finally.

View attachment 60772View attachment 60773View attachment 60774View attachment 60775View attachment 60776View attachment 60777
Click to expand...
You should be justifiably proud of your accomplishment. I'm all about a beautiful car having a matching engine bay revealed when the hood is raised. Gotta feel good to be on that side of the finish line...

PS - Really like the jet engine blade wall art -- gives the workspace a little senseless mil-spec beauty. :0)

Cheers --
 
Those are the current blend limits for the P&W F100-229 HPC blades.

(Engine used on the F-15 and F-16)

That's the inspection area at work...
 
You must log in or register to reply here.
Back
Top