Crack v1.1 — Voltage readings for T2 & T4 are higher than expected [resolved]

[Ember]

After assembly, checking solder joints, and performing resistance checks, I plugged in the tubes and performed voltage checks but a couple readings aren't matching up to the documentation.

T2 & T4 — Reads as high as 290V initially, then drops down to around 211-212V and remains stable at that voltage.

T7 & T9 — While these readings aren't as significantly off as T2/T4, they are still reading a bit high at 123V to 125V.

What should I check?

 

[Paul Birkeland]

What voltages do you get at T1 and T5?  What was your measured incoming AC line voltage?

 

[Ember]

Thank you for the help

Incoming AC — 121V-123V

T1 — 92V
T5 — 93V

 

[Paul Birkeland]

You have a 6080 with very healthy emission, I wouldn't be concerned about those voltages.

-PB

 

[Ember]

Awesome! Thank you very much.

 

[Ember]

Just wanted to report that I tested the amp with headphones, things seem to be working well!

Sounded better than I anticipated with T50RP MK3 headphones. Looking forward to trying the Massdrop x Sennheiser HD 6XX on the Crack once the headphones arrive this coming Saturday, then applying the Speedball. Been fun so far, looking forward to more.

Thanks once again PB for your help, wasn't expecting to get things sorted over the weekend. Worked on the amp with my mom other than the finishing touches and had a chance to show her it working and completed on Sunday when we celebrated Thanksgiving.