DC Voltage check terminals 6 and 16

PapaF · 158

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Offline PapaF

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on: June 07, 2024, 05:36:07 AM
Hello All,
New member here. Appreciate any answers. Just finished cathode wiring BeePre2.
On page 55 of manual it states that DC voltage checks should be close to 10 volts between 14U and Term 25 as well as 14U and Term. 30. My voltages were 9.47VDC and 9.42 VDC respectively.
Also DC voltage check should be close to 100V between 14U and Term. 6 as well as 14U and Term.16.
My voltages were 90.1 and 90.8 respectively.
Are these voltages close enough? If not, where to look? All resistance and voltage checks have been perfect to this point.
Thanks for any help.

Offline Paul Birkeland

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Reply #1 on: June 07, 2024, 06:58:37 AM
Those voltages are good.  You'll notice in the pictures in the manual that one of the 300Bs in the manual build came in at 9.55V and one at 9.71V.  The low bias voltage and low plate voltage might suggest something like 117V AC coming out of the wall with the power transformer wired for 120V.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline PapaF

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Reply #2 on: June 07, 2024, 12:47:59 PM
Thanks Paul. The 90V out of 100 concerned me more. I went ahead, finished and fired her up.
PERFECT!  No hum just pure sound.
Thanks again to you and Dan for a great kit! My first tube build.