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May 20, 2019, 11:40:45 am

Author Topic: Bad 6𝜋14𝜋 tube? [resolved]  (Read 305 times)

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Offline Raymond P.

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Bad 6𝜋14𝜋 tube? [resolved]
« on: November 09, 2018, 10:47:40 am »
Hi,

So I completed my BeePre build and passed resistance checks. Then I plugged it in and noticed that the two LEDs on the A-side of the right channel C4S board were not lit. I proceeded with the voltage checks and found these nodes to have incorrect values. (btw, all tubes glow.)

T6: 188V (should be 146V)
T10: 190.8V (should be 186V)
C3: 1.23V (should be 3.5-4.5V)
C7: 188V (should be 147V)
C9: 188V (should be 147V)

Suspecting the right channel 6𝜋14𝜋 tube wasn't conducting, I swapped it with the left channel to see if the bad readings followed. Sure enough, they did, as well as the two non-lit LEDs. I then pulled the problematic tube to clean the pins, but that didn't help.

Should I go ahead and ask for a replacement?

Thanks!

« Last Edit: November 25, 2018, 02:15:20 pm by Paul Birkeland »
Raymond P.

Offline Paul Birkeland

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Re: Bad 6𝜋14𝜋 tube?
« Reply #1 on: November 09, 2018, 05:18:37 pm »
If the issue follows a tube, then that would indicate that a replacement is in order. 

-PB
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Raymond P.

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Re: Bad 6𝜋14𝜋 tube?
« Reply #2 on: November 09, 2018, 07:30:40 pm »
Ok, thanks! Replacement request sent.
Raymond P.

Offline Raymond P.

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Re: Bad 6𝜋14𝜋 tube?
« Reply #3 on: November 24, 2018, 03:17:18 pm »
Quick update. Got a replacement tube (thanks @fullheadofnothing), plugged it in, and the BeePre passed the voltage tests.
Raymond P.