Re: Didn't find that EL84 schem ...

Posted by John Swenson (A) on May 9, 2006 at 08:39:16

In Reply to: Didn't find that EL84 schem ... posted by gluca on May 9, 2006 at 07:22:01:

Here is the post on the EL84 version. I modified it slightly since this schematic, I'm now using mercury rectifiers.

As good as the EL84 is, the the 813 with RS-500 is significantly better, even at its current "low power" implementation I can really hear the difference in increased power cabability. I like listening to big choral pieces which have a huge dynamic range. With the EL84 things get strained at the peaks, with this its just so effortless.

What I found works the best is to put the speaker on the 16 ohm configuration, this way in the bass (which is about 16 ohms in my enclosures) you get the full power output which is where you need it. In the midrange it presents 2.5K to the amp so there is less maximum power available, but it doesn't matter there. With this configuration I can get away with a 50H plate choke.

Well back to listening!

John S.

EL84 transconductance amp (Open in New Window)

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Follow Ups Full Thread

Topic - Big Heavy box arrived today! - John Swenson 00:27:58 05/09/06 (18)

Wildfire Pictures - John Swenson 17:55:06 05/16/06 (0)

'Shoot yourself in the foot' Hammond Audio - JIMMY 06:24:21 05/14/06 (0)

Medium sized box with beautiful EXO99's have arrived - Bas Horneman 08:55:01 05/13/06 (5)

Pat's king of steaks.... a phila institution.... - mqracing 13:53:04 05/13/06 (2)

I would love to take you up on that offer!!! - Bas Horneman 01:25:48 05/22/06 (0)

Re: Pat's king of steaks.... a phila institution.... - Doc B. 13:38:58 05/18/06 (0)

a philly wall painting for Bas - mqracing 13:44:46 05/13/06 (1)

Thanks Mike, I feel a little better now ;-) .nt. - Bas Horneman 12:10:53 05/15/06 (0)

your a champion John..... - mqracing 22:00:25 05/11/06 (0)

Schematic - yes please - Mike Spence 21:58:39 05/09/06 (4)

Re: Schematic - yes please - John Swenson 15:23:33 05/10/06 (3)

Yep more questions! - Mike Spence 17:04:43 05/10/06 (2)

Re: Yep more questions! - John Swenson 16:40:51 05/11/06 (1)

Thanks John! (nt) - Mike Spence 18:14:27 05/11/06 (0)

Didn't find that EL84 schem ... - gluca 07:22:01 05/09/06 (3)

Re: Didn't find that EL84 schem ... - John Swenson 08:39:16 05/09/06 (2)

the 813 schematic - m8o 20:51:06 12/18/06 (1)

Re: the 813 schematic - m8o 20:52:41 12/18/06 (0)

Follow Ups

Re: Didn't find that EL84 schem ... - John Swenson 08:39:16 05/09/06 (2)

the 813 schematic - m8o 20:51:06 12/18/06 (1)

Re: the 813 schematic - m8o 20:52:41 12/18/06 (0)

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