Diy vox ac15 no output

[juhani77]

Hi!

I have just finished a vox ac15 build. Installed tubes and turned it on and no sound is coming out. No hiss or hum or anything even if volume and mastervolume is full up. No crackling sounds when poking the primary leads connected to powertubes.

Signal path is ok (can't find any errors), OT seems to be ok. OT secondary common is connected to ground, and 4ohm and 8ohm taps are connected to own jacks.

When all volume is full up I can hear distorted sound from the amplifier/OT?? Nothing from speaker. I allmost think that output is grounded.

When I check for continuitys in OT secondaries, the 4ohm and 8ohm sees ground, but should it? The secondary winding common is connected to ground so does it confuse things? Or have I just wired the output jacks wrong? They are plastic type where there are switches.

Any Ideas?

Pictures:

https://www.flickr.com/photos/103587818 ... 958673176/

Thanksw

Edit. Here are voltages on tubes:

V1

Pin1 78v
Pin2 -
Pin3 1,2v
Pin6 123v
Pin7 -
Pin8 1,9v

V2

Pin1 275v
Pin2 124v
Pin3 124v

V3

Pin1 210v
Pin2 39v
Pin3 58v
Pin6 210v
Pin7 39v
Pin8 59v

V4

Pin2 -
Pin3 11v
Pin7 325v
Pin9 325v

V5

Pin2 -
Pin3 11v
Pin7 325v
Pin9 325v

[juhani77]

Found the problem. I connected the secondary wires wrong to cliff jack. When the speaker plug was pushed in the ground and OT common was lifted up and there was only 8ohm tap going to speaker.