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Thanks Mikey - ECC99 are huming nicely

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Posted on February 12, 2017 at 14:28:39
banpuku
Audiophile

Posts: 927
Joined: January 19, 2006
With much thanks and help from Mike Samra, my newly installed ECC99 drivers are working nicely. In my 2A3 amps, I have wanted to try out some triode drivers. Recently many of you volunteered ideas for triode drivers, little did I realize that I had 2 of the ECC99 tubes already at home. So, it was easy to install the 9-pin sockets and the tubes.

The optimal operating points for the ECC99 are not final, but with some help from Mikey we were able to get very close. The ECC99s have led bias (5V+) and are running at 180V, but more to come soon as I need a few higher wattage resistors.

Once I installed the ECC99 drivers, the sound was much warmer and fuller, which is what has been elusive for me. The ECC99s seem to be a nice match with the JJ 2A3-40 output tubes which are dialed in at 12.1W dissipation. Very happy with the sound for now.

 

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RE: Thanks Mikey - ECC99 are huming nicely, posted on February 13, 2017 at 17:46:12
Michael Samra
Dealer

Posts: 35580
Location: saginaw michigan
Joined: January 30, 2005
Contributor
  Since:
June 24, 2005
Pat
You can dial that JJ tube in for a lot more power if we raise the B+ to around 450v.

"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

 

JJ 2A3 maximum power. , posted on February 14, 2017 at 09:52:20
maxhifi
Audiophile

Posts: 520
Location: Alberta, Canada
Joined: August 4, 2004
What's the operating conditions you suggest for a lot more power? I have JJs too, may want to try the maximum power condition some day .

 

RE: Thanks Mikey - ECC99 are huming nicely, posted on February 14, 2017 at 11:45:15
Lew
Audiophile

Posts: 8775
Location: Bethesda, Maryland
Joined: December 11, 2000
Is the ECC99 doing both voltage amplification and driver functions? If so, I would understand better that Mike says you can tweak the settings to get more power. Thanks.

 

RE: Thanks Mikey - ECC99 are huming nicely, posted on February 14, 2017 at 11:54:19
banpuku
Audiophile

Posts: 927
Joined: January 19, 2006
The ECC99 is serving a driver function only. I believe Mikey was referring to a higher B+ to get the most out of the JJ 2A3-40 output tubes.

 

Pat is running the 2A3-40 at about 265 between cathode and plate., posted on February 15, 2017 at 10:36:31
Michael Samra
Dealer

Posts: 35580
Location: saginaw michigan
Joined: January 30, 2005
Contributor
  Since:
June 24, 2005
The JJ 2A3-40 can handle 450v as I recall and boosting the B+ is the first thing he would have to do.The other night when I was helping him,the ECC99 was drawing 35ma.That told me we had to raise the cathode voltage by adding more LEDs and then it dropped to 21ma but also,he was only running 243v between the plate and cathode of the 2A3 so we had to raise the B+ to at least get it to a 250v potential which he did.The first choke went to the 2hy 35 ohm tap and that helped with that.

"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

 

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