Rectifier oddness

no gas · 1st December 2011, 07:26 PM

On my KT88 SE that I built I was using a new EH5U4 rectifier and I noticed that my very over-kill power transformer was getting very warm. I replaced the EH5U4 with an old RCA 5U4 and the PT no longer ran hot. I also used a russian 5U3C and it ran cool. It also sounded fantastic with the russian tube. Any ideas why the EH5U4 would cause to heating problem where the same tubes of different makers did not?

Sch3mat1c · 2nd December 2011, 01:38 AM

Voltage, current measurements? "Sounded fantastic" doesn't give me numbers like the power dissipation of your transformer.

Tim

M Gregg · 2nd December 2011, 07:42 AM

Quote:

Originally Posted by no gas

On my KT88 SE that I built I was using a new EH5U4 rectifier and I noticed that my very over-kill power transformer was getting very warm. I replaced the EH5U4 with an old RCA 5U4 and the PT no longer ran hot. I also used a russian 5U3C and it ran cool. It also sounded fantastic with the russian tube. Any ideas why the EH5U4 would cause to heating problem where the same tubes of different makers did not?

I guess,

Check heater current difference and voltage drop across the tube / B+ voltage level and see if there is a difference between tubes..

Regards
M. Gregg

1st December 2011, 07:26 PM	#1
no gas diyAudio Member Join Date: Jul 2010 Location: Los Angeles	Rectifier oddness On my KT88 SE that I built I was using a new EH5U4 rectifier and I noticed that my very over-kill power transformer was getting very warm. I replaced the EH5U4 with an old RCA 5U4 and the PT no longer ran hot. I also used a russian 5U3C and it ran cool. It also sounded fantastic with the russian tube. Any ideas why the EH5U4 would cause to heating problem where the same tubes of different makers did not? __________________ My stuff: MC30, MC225, MX110, PAS3, ST-70, RH-84, HK A224 and a lot of parts waiting for time.

2nd December 2011, 01:38 AM	#2
Sch3mat1c diyAudio Member Join Date: Jan 2003 Location: Milwaukee, WI	Voltage, current measurements? "Sounded fantastic" doesn't give me numbers like the power dissipation of your transformer. Tim __________________ See my Electronics webpage -- the home of Vacuum Tube Drag Racing. The key to being a successful Audiophile: "I reject your reality and substitute my own!"

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