ECC40 driver stage for 2A3

cypher · 23rd August 2008, 08:20 PM

I have decided to change driver stage in my 2A3 amp, instead of ECC81 I was trying to use ECC40.
I applied ECC40 in SRPP but unfortunately this setup hasn’t sound good. Perhaps this is not the best tube for SRPP. Perhaps someone could help me and point appropriate way to use this very tube..
Thank you ;-)
Artur

Hi-Q · 23rd August 2008, 08:39 PM

According to the info provided here-

http://www.r-type.org/pdfs/ecc40.pdf

This should be a great valve for the purpose you intend. I have a couple of them myself but no bases for them so they have stayed in the proverbial junk box. I note that the article at the above web site has some advice on instability that may result from using the valve and warns of careful wiring layout and perhaps provision of neutralising capacitors. It would be great if someone on this Forum has had specific experience with this valve as they may be able to offer you some further practical advice.

andyjevans · 23rd August 2008, 11:11 PM

I've used the ECC40 in differential pairs with a constant curent sink under and it sounds superb - better than anything, including the E80CC. It's my favourite small tube and I listen to it every day in my amp. I never tried SRPP though, and in general I've stayed with lowish HT and currents, using it with plenty to spare. It has lovely treble.

Andy

cypher · 24th August 2008, 07:56 AM

Hi Andy,
Could you possibly post schematic with parts and their values ?
I’m sure that more people would be interested in.

Artur

23rd August 2008, 08:20 PM	#1
cypher diyAudio Member Join Date: Mar 2007	ECC40 driver stage for 2A3 I have decided to change driver stage in my 2A3 amp, instead of ECC81 I was trying to use ECC40. I applied ECC40 in SRPP but unfortunately this setup hasn’t sound good. Perhaps this is not the best tube for SRPP. Perhaps someone could help me and point appropriate way to use this very tube.. Thank you ;-) Artur

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23rd August 2008, 08:39 PM	#2
Hi-Q diyAudio Member Join Date: Oct 2007	According to the info provided here- http://www.r-type.org/pdfs/ecc40.pdf This should be a great valve for the purpose you intend. I have a couple of them myself but no bases for them so they have stayed in the proverbial junk box. I note that the article at the above web site has some advice on instability that may result from using the valve and warns of careful wiring layout and perhaps provision of neutralising capacitors. It would be great if someone on this Forum has had specific experience with this valve as they may be able to offer you some further practical advice.

23rd August 2008, 11:11 PM	#3
andyjevans diyAudio Member Join Date: Sep 2003 Location: London	I've used the ECC40 in differential pairs with a constant curent sink under and it sounds superb - better than anything, including the E80CC. It's my favourite small tube and I listen to it every day in my amp. I never tried SRPP though, and in general I've stayed with lowish HT and currents, using it with plenty to spare. It has lovely treble. Andy

24th August 2008, 07:56 AM	#4
cypher diyAudio Member Join Date: Mar 2007	Hi Andy, Could you possibly post schematic with parts and their values ? I’m sure that more people would be interested in. Artur

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