Thicker PL400 faceplate with new analog meters...

[grapplesaw]

If those are stepped attenuators, isn't having only 5 positions leave some big jumps from one setting to the next? I suppose that the preamp will take up some of that. That's the one thing I didn't like about the Pro 700's. But setting the attenuators on the amp to about the 2-3 O'clock position and then using the pre made it just right. I also used a regular PL-700 pot on them in some cases.

You could be right. These are two pole 12 positions make then break pots

not sure if they can work

 

[J!m]

There is an audible performance difference between an attenuator and a potentiometer.

Plus you can cherry pick the resistors that go into an attenuator. But the eBay one I got with 0.1% SM resistors sounds fantastic- WAY better than a premium Bourns pot.

 

[WOPL Sniffer]

You can call them what you want but they do the same thing. As I said, we can find something better than a $2.00 pot.

 

[marcok]

Chapeau , Joe !
Ciao
Marco

 

[laatsch55]

The Pig's getting a new face!!!

 

[gary33030]

Joe,

I'll take one!

 

[wattsabundant]

I understand the meter is backlit. Via what means? LED? Certainly not incandescent. Adjustable brilliance? I assume any backlight is powered off of the low voltage winding. is there a viewable prototype?

 

[Gepetto]

I understand the meter is backlit. Via what means? LED? Certainly not incandescent. Adjustable brilliance? I assume any backlight is powered off of the low voltage winding. is there a viewable prototype?

LEDs, 14 total, 7 on each side illuminating the backlight light guide.

Fixed illumination, powered off the existing 6VAC winding of the original transformer. Meter still has the protective release liner applied to the face in these photos.

 

[krellmk]

I got some off these.

I’m sure they are from a noise free environment

View attachment 73986

Wow !!! Non -Magnetc PRP Resistors...nice


Non-Magnetic

 

[BlueCrab]

Two thumbs up from me. Love it.

 

[Gepetto]

And best of all, none of this garbage...

 

[George S.]

Outstanding (as usual)!

 

[Vintage 700b]

LEDs, 14 total, 7 on each side illuminating the backlight light guide.

Fixed illumination, powered off the existing 6VAC winding of the original transformer. Meter still has the protective release liner applied to the face in these photos. View attachment 74312 View attachment 74313 View attachment 74314

Wow, another home run Joe !!!!
Very Nice !

 

[laatsch55]

No more silicone on the meter housings!!

 

[Gepetto]

No more silicone on the meter housings!!

= kludge

 

[laatsch55]

Amen...

 

[Mohawk]

Wow, another home run Joe !!!!
Very Nice !

Joe,

Looks awesome

 

[porkchop61]

Wow!

 

[Gibsonian]

Big beautiful well lit and ultra responsive meters, how do you say no?

 

[Oldskoolfan]

Incorporating all these upgrades, seems to me this evolves the Pl400 to a whole new subspecies.