Noisy EL84 amp needs new front end

Charles Wasserf · 9th September 2008, 05:13 AM

My just bought second hand EL84 SE amp with no input and with volume control at minimum makes a crackling sound over the speakers. Changing the tubes didn't help. It is an intermittent problem but still plays music over the noise. It uses an ECC83 and 2 X EL84 pentode mode per channel I don't particularly like the sound of the ECC83 which is configured as SRPP and would like to upgrade this section. I have about 280 volts from the power supply. Tubes I have at hand are ECC81, ECC88, 2C51, 12B4 and 6SN7. This amp is made by Audio Note with large excellent output transformers. Any suggestions to take this up to the next level.
Regards Charles

diegot · 9th September 2008, 12:20 PM

Try the RH84, very quiet and good sonics.
http://www.tubeaudio.8m.com/RH84/rh84.html

Charles Wasserf · 10th September 2008, 04:32 AM

Hi diegot,
I have been looking at that design but can I just parallel up a pair of EL84's withouy any changes to the circuit. I also notice that most pentode users like to regulate the screen supply. Also what change in sound can I expect. Still have that noise which may be a PSU problem. I need the EL84 Gurus advice
Regards, Charles

9th September 2008, 05:13 AM	#1
Charles Wasserf diyAudio Member Join Date: Mar 2005 Location: durban	Noisy EL84 amp needs new front end My just bought second hand EL84 SE amp with no input and with volume control at minimum makes a crackling sound over the speakers. Changing the tubes didn't help. It is an intermittent problem but still plays music over the noise. It uses an ECC83 and 2 X EL84 pentode mode per channel I don't particularly like the sound of the ECC83 which is configured as SRPP and would like to upgrade this section. I have about 280 volts from the power supply. Tubes I have at hand are ECC81, ECC88, 2C51, 12B4 and 6SN7. This amp is made by Audio Note with large excellent output transformers. Any suggestions to take this up to the next level. Regards Charles

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9th September 2008, 12:20 PM	#2
diegot diyAudio Member Join Date: Sep 2004 Location: Brazil	Try the RH84, very quiet and good sonics. http://www.tubeaudio.8m.com/RH84/rh84.html

10th September 2008, 04:32 AM	#3
Charles Wasserf diyAudio Member Join Date: Mar 2005 Location: durban	Hi diegot, I have been looking at that design but can I just parallel up a pair of EL84's withouy any changes to the circuit. I also notice that most pentode users like to regulate the screen supply. Also what change in sound can I expect. Still have that noise which may be a PSU problem. I need the EL84 Gurus advice Regards, Charles

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