JJ Tesla ECC99 as a driver for 300B-2A3

konstantin · 28th June 2003, 03:19 PM

Hello everybody,

Has anyone tried the new JJ Tesla ECC99 as a driver for the 300B or the 2A3?
I hear great things about this tube compare to the 6SN7.

Regards

dshortt9 · 28th June 2003, 03:28 PM

In case you have not seen this:

http://www.ampdesign.de/ECC99%20Artikel.htm

vuki · 29th June 2003, 07:21 AM

I'm using it in my SE300b amp. Before I had 6sn7 in a "classic" arrangement with 2 capacitor coupled common cathode stages and it was already very good. Then I tried Thorsten-suggested pentode single stage drive, but didn't like it at all - it sounded agressive although it had better THD specs. Finally, last year, a friend gave me 2 ecc99's to try. I made 2 DC coupled common cathode stages and it really was singing! Great sound and excellent specs. I'm listening to it ever since.

konstantin · 29th June 2003, 12:13 PM

Hello Vuki,

What's the input sensitivity for full output power with the ECC99?
Can you share the eschematic with the rest of us?

vuki · 1st July 2003, 12:29 PM

hi konstantin,

I can't give the exact schematic (couldn't find it anymore) but as I remember -
first triode has 22k anode resistor, 180R cathode resistor, 100k input resistor and 330R gridstopper.
Grid of the second triode is via 330R gridstopper resistor connected to the anode of the first triode and that triode has 6k8 resistors on anode and cathode. 6k8 cathode resistor is bypassed with 10uF capacitor. Second triode's anode is via 0.22uF cap and 820R gridstopper connected to 300B's grid and there is 180k input resistor connected between cap/gridstopper junction and ground. 300B's cathode resistor is 1k and is bypassed with 100uF.
B+ is 450V for 300B and ca. 350V for ECC99. Both tubes are DC heated.

konstantin · 1st July 2003, 04:26 PM

Hi Vuki,

So, you "running" the fisrt triode at about 18ma and the second about 5ma, no cap between, right?

Regards
K

vuki · 1st July 2003, 08:43 PM

No, I found it - the first one is 15k on anode and 120R on cathode (ca 16ma), the second is then also around 16ma.

regards,
Vuki

28th June 2003, 03:19 PM	#1
konstantin diyAudio Member Join Date: Feb 2003 Location: PATRA GREECE	JJ Tesla ECC99 as a driver for 300B-2A3 Hello everybody, Has anyone tried the new JJ Tesla ECC99 as a driver for the 300B or the 2A3? I hear great things about this tube compare to the 6SN7. Regards

29th June 2003, 12:13 PM	#4
konstantin diyAudio Member Join Date: Feb 2003 Location: PATRA GREECE	ECC99 Hello Vuki, What's the input sensitivity for full output power with the ECC99? Can you share the eschematic with the rest of us?

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28th June 2003, 03:28 PM	#2
dshortt9 diyAudio Member Join Date: Apr 2001 Location: Milwaukee, Wisconsin	In case you have not seen this: http://www.ampdesign.de/ECC99%20Artikel.htm

29th June 2003, 07:21 AM	#3
vuki diyAudio Member Join Date: Jun 2002 Location: zagreb, croatia	I'm using it in my SE300b amp. Before I had 6sn7 in a "classic" arrangement with 2 capacitor coupled common cathode stages and it was already very good. Then I tried Thorsten-suggested pentode single stage drive, but didn't like it at all - it sounded agressive although it had better THD specs. Finally, last year, a friend gave me 2 ecc99's to try. I made 2 DC coupled common cathode stages and it really was singing! Great sound and excellent specs. I'm listening to it ever since.

1st July 2003, 12:29 PM	#5
vuki diyAudio Member Join Date: Jun 2002 Location: zagreb, croatia	hi konstantin, I can't give the exact schematic (couldn't find it anymore) but as I remember - first triode has 22k anode resistor, 180R cathode resistor, 100k input resistor and 330R gridstopper. Grid of the second triode is via 330R gridstopper resistor connected to the anode of the first triode and that triode has 6k8 resistors on anode and cathode. 6k8 cathode resistor is bypassed with 10uF capacitor. Second triode's anode is via 0.22uF cap and 820R gridstopper connected to 300B's grid and there is 180k input resistor connected between cap/gridstopper junction and ground. 300B's cathode resistor is 1k and is bypassed with 100uF. B+ is 450V for 300B and ca. 350V for ECC99. Both tubes are DC heated.

1st July 2003, 04:26 PM	#6
konstantin diyAudio Member Join Date: Feb 2003 Location: PATRA GREECE	Hi Vuki, So, you "running" the fisrt triode at about 18ma and the second about 5ma, no cap between, right? Regards K

1st July 2003, 08:43 PM	#7
vuki diyAudio Member Join Date: Jun 2002 Location: zagreb, croatia	No, I found it - the first one is 15k on anode and 120R on cathode (ca 16ma), the second is then also around 16ma. regards, Vuki