183 Build Report

[UltraHookedOnPhonix]

Just finished a 183-type build so I thought I’d show some voltages n’ pics. Big shout out to Billy Yates of Venice Amplifier Company who helped me get it started. Everything would have fired up smoothly if it hadn’t been for a bum EL34. But when it finally did, it sounded awesome!
Tubes are: 2 Chinese 12AX7A for V1, V2 and one Sovtek 12AX7LPS in the PI. Power tubes are Ruby EL34BHT (Chinese).
Transformers: Custom Heyboer PT ordered from Jason aka jborders5, Choke and OT are New Sensor NSC125C1A and MOP-100 respectively.
The HT/rectifier PCB comes from jborders5 and the rest of them were bought from Brandon.
Chassis is the CE chassis.

I’m currently waiting on Jelle to provide a head cab for it. Should be…radical!!!

Also, thanks to Shad for the info on this amp. Exciting circuit!

Here are some voltages:

No load B+: 479V
Loaded B+: 462V
Screens: 456V
B+3: 436V
B+4: 321V
B+5: 313V

OD
Pin 1: 214.5V
Pin 6: 207.5V

CL
Pin 1: 200.9V
Pin 6: 189.2V

PI
Pin 1: 295V
Pin 6: 300V

Bias Voltage: -41.2V


[IMG502]http://i205.photobucket.com/albums/bb17 ... n/Pic1.jpg[/img]

[IMG:768:1024]http://i205.photobucket.com/albums/bb17 ... n/Pic2.jpg[/img]

[IMG768]http://i205.photobucket.com/albums/bb17 ... n/Pic3.jpg[/img]

[IMG768]http://i205.photobucket.com/albums/bb17 ... n/Pic4.jpg[/img]

[IMG768]http://i205.photobucket.com/albums/bb17 ... n/Pic5.jpg[/img]

[IMG768]http://i205.photobucket.com/albums/bb17 ... n/Pic6.jpg[/img]

[IMG768]http://i205.photobucket.com/albums/bb17 ... n/Pic7.jpg[/img]

[IMG768]http://i205.photobucket.com/albums/bb17 ... n/Pic8.jpg[/img]

[IMG768]http://i205.photobucket.com/albums/bb17 ... n/Pic9.jpg[/img]

[IMG768]http://i205.photobucket.com/albums/bb17 ... /Pic10.jpg[/img]

[IMG768]http://i205.photobucket.com/albums/bb17 ... /Pic11.jpg[/img]

[T Wilcox]

Beautiful work, dig the colorscheme
Forgive my stupidity but what is the switch with all the yellow wires, looks like an impedance switch with like 20 contacts

[ic-racer]

Fantastic build quality! Good work!

[tubedogsmith]

Great looking build Jonas!!

[rob@tele]

Wow that's a very clean and tidy job!

[boldaslove6789]

Lovely build! Very clean!

[67plexi]

Sweet build Ultra, Dig the CTS trimmers.

[odourboy]

Dude! Nice job

[UltraHookedOnPhonix]

Thanks all!

Wilcox, see more here bout the switch:
http://ampgarage.com/forum/viewtopic.ph ... ctroswitch

[dogears]

Jonas, the real 183 had the Jan Phillips 12AX7WA short plates in it. Nice strong ones testing NOS.

These sound totally different than the tubes you used. I'd suggest grabbing some GE shortplates to hear the circuit the way 183 is tubed (at least now).

Tubes similar are the old Sylvania short plates with square getter, GE short plates with halo, and of course the JAN Phillips which seem to be the same as the GE with halo.

Not the Sylvania long grey plates. Avoid these. They are also sometimes labeled JAN.

[Structo]

Beautiful amp!

Man that is a clean build!

[erwin_ve]

Neat built! I could eat from it (with discharged fiter caps off course)

[markusw]

Fantastic looking build!

Makes me want to build again! Congratulations!

Jonas, the real 183 had the Jan Phillips 12AX7WA short plates in it. Nice strong ones testing NOS.

I thought that the JAN Philips 12AX7WA were built in the Sylvania factory?
Edit: sorry, missed what you wrote about long plates Sylvania...


Peace,

Markus

[stevlech]

Nice work on the build and fantastic photography. Oh, to have such good pics of an original...

[stelligan]

Superb work!! Can't wait to see the cab. Suede?