S.E.X. 3.0 Kit: Right headphone driver is significantly quieter [resolved]

[Jet]

I sent an email to Eileen about a repair box on Sunday but I haven't gotten a response?

 

[QueenBottlehead]

Hi Jet, I don't seem to have an email from you requesting a repair box. Do you mind sending it again to queen@bottlehead.com? Thanks so much, Eileen

 

[Jet]

The request should've come from Geoff Spear

I've received the box and I just packed up the amplifier, it should be ready to ship out tomorrow.

 

[Paul Birkeland]

Today I got this SEX amp on my bench.  The 220 ohm resistor between A10 and A8 was poorly soldered and creating a major part of the channel imbalance (about 20dB). Two of the jumper wires on the output transformer got hot enough during soldering to melt together and short out, which effectively reduced the output of that channel to nothing.

Either problem on its own wouldn't be that difficult to track down, but the intermittent nature of the loose 220 ohm resistor made sorting all of this out rather difficult.

Once these two issues were dealt with, I discovered that one of the 6FJ7s was not super happy about operating with these issues, but I have a loose replacement that's a match for the remaining good tube.

 

[Jet]

Thanks so much for the update and letting me know exactly what was wrong with the amp, it's nice to know that the issues are being taken care of.