z original prescription schematic or info

[M Fowler]

OK I still have unanswered details for the choke and main cap I need to go over with time.

[M Fowler]

Here is version 4

[Vince]

..

[M Fowler]

Vince,

Thanks but that is the RxES which uses an optoisolater boost function and the amp that Dr Z is helping us build is his original RX.

Mark

[paisley_tele]

Did you get a final layout yet on the original rx

[M Fowler]

No I got too busy with other amps and the chassis is still taped and marked for drilling as we speak.

I then to do a layout half way and then just build the damn thing. I love to design layouts and placement as I build.

[sst4270]

Guys,

So I was just surfin' google images the other day and I found the site below:

http://www.proguitar.de/ProGuitarPreisliste/Links/DrZ/

Holy crap! What a great stash of images.

Drill up the directory and you'll find photos of other boutique amps as well.

Drill all the way up to the main site to get a look at the front page:
http://www.proguitar.de/

I must've spent an hour easily downloading every single photo I could from this site.

Anyways there are some great gut shots of the Prescription JR and ES. I don't know, but I hope this helps this thread out.

Enjoy,

Steve

[paisley_tele]

i did that too. the rxes looks nice. hard to tell what caps are in any of the pics thou. the wiring can be seen great and the resistor can be made out good to

[Drumslinger]

nice one Steve. Thanks!

[stratomaster]

I know this is an old thread, but I came across it while servicing one of the these. I figured I'd add a clean image of the interior.

This one has a few changes I made. Parallel first stage triode with resistor adjustments to keep the same frequency response. Push-pull 10% audio volume pot to replace the unusable sweep of the linear pot and actuate the boost without the footswitch. LarMar MV, and a fresh 62Ω cathode resistor and 40v 220μF cap. The original 50Ω was nuking the tubes at nearly 140% idle dissipation and was mounted between the two electrolytic caps--heating them both. The 62Ω lowers the idle to a balmy 122% while keeping the plate voltage below 350v, and now it's mounted away from the temperature sensitive components.