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Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

B+ too high.
B+ too high.
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Old 5th December 2019, 08:33 AM   #11
Lordlidder is offline Lordlidder  England
diyAudio Member
Join Date: Nov 2017
Location: Devon
Yes that was at half power on the primary....120 volts. So all sorted out now! Thanks all.
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Old 5th December 2019, 09:46 AM   #12
dandee is offline dandee  United States
diyAudio Member
Join Date: Dec 2015
Default KT88

I also Built the KT88 Blueglow amplifier...
under no load the B+ is going to be off the charts...
its not important till the amplifier is under load...
using the 5AR4 rec tube the B+ across the main filter cap under load
should be right around 460V DC..

you should avoid running the B+ with no load... it will
be to high for the power supply cap.. 100-100 500V

if you need any help just message me.. ALSO.. it s a awesome amplifier !.

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