Bottlehead Forum

Bottlehead Kits => S.E.X. Kit => Topic started by: Airvernel on May 14, 2015, 04:40:36 AM

Title: No high voltage readings
Post by: Airvernel on May 14, 2015, 04:40:36 AM

Hi,

finished S.E.X. 2.1 without any upgrades (yet) and all resistances and all but the high voltages read correctly. All the terminals with high voltages though (marked in the pictures) read -0.3V DC. Any idea what's causing this? Tube filaments glow nicely.

Thanks in advance!

Max

Title: Re: No high voltage readings
Post by: Paul Birkeland on May 14, 2015, 04:49:08 AM

What AC voltage do you have between power transformer terminals 6 and 7? 

-PB

Title: Re: No high voltage readings
Post by: Airvernel on May 14, 2015, 04:55:45 AM

Your reply made me notice that the tiny connection of terminal 7 to the power transformer is split (AC voltage between 6 and 7 close to 0)... so could i just solder this back together?

Title: Re: No high voltage readings
Post by: Paul Birkeland on May 14, 2015, 05:00:34 AM

Yes, that would likely be the culprit.

-PB

(Also, in your second picture posted, be sure the 150K resistor and 1.27K resistor don't have leads touching)

Title: Re: No high voltage readings
Post by: Airvernel on May 14, 2015, 05:02:10 AM

Alright, will try that and report back. The resistors are actually about a cm apart from each other, it's just the point of view :)

Title: Re: No high voltage readings
Post by: Airvernel on May 14, 2015, 05:22:06 AM

Perfect readings now - thanks for the spot on help!

Great sound... for the right channel. None for the left :P

Nothing to do with the tubes - switching them does no change.

Update: all good. One of the 90° cinch adapters seems to be broken. sex up and running  8)

Not the slightest hint of hum or crackling btw. just perfectly dead background and clear sound.