EL84 as both driver and output stage.

pwan · 14th June 2007, 06:29 PM

Hello

I have tons of EL84/6BQ5/6P14P around.

I wonder if any one here come across a SE schematic that use EL84 on both driver and output stage ?

Thanks !

SY · 14th June 2007, 07:05 PM

The EL84 is sooooo easy to drive that I can only ask, "Why?" Use the second one in parallel for double the power, then drive 'em with something more appropriate (i.e., less power delivery, which is useless, but better linearity, which is useful).

pwan · 14th June 2007, 07:10 PM

Quote:

Originally posted by SY
The EL84 is sooooo easy to drive that I can only ask, "Why?"

Simply because I have too many (100s) of EL84 and want to utilize them as much as I can

Any further guidance please? Thanks!

SY · 14th June 2007, 07:18 PM

50 in parallel per channel. Or just use two and send me the rest.

Miniwatt · 14th June 2007, 07:23 PM

pwan · 14th June 2007, 07:26 PM

Quote:

Originally posted by SY
50 in parallel per channel. Or just use two and send me the rest.

Quote:

Originally posted by Miniwatt

I am serious !!

Yvesm · 14th June 2007, 07:28 PM

A quick check with Tube CAD.

Triode connected, 250V B+, 10K anode load resistor and bypassed 600 ohms in the cathode should produce near 23dB gain.
Just enough to drive another one.
Not so hi anode current (10mA) but still 4,5W absorbed by the heater.

Yves.

KaDe · 14th June 2007, 09:07 PM

Hello
The EL84 can work as line driver also.
I have attached a Vollmer pre-amp circuit with EL84 transformer output for you.

Miniwatt · 14th June 2007, 09:28 PM

Quote:

Originally posted by pwan

I am serious !!

Yeah, I know, I was laughing because of SY's reply "50 in parallel per channel. Or just use two and send me the rest."

BTW interesting question

pwan · 15th June 2007, 12:47 AM

Quote:

Originally posted by Yvesm
A quick check with Tube CAD.

Triode connected, 250V B+, 10K anode load resistor and bypassed 600 ohms in the cathode should produce near 23dB gain.
Just enough to drive another one.
Not so hi anode current (10mA) but still 4,5W absorbed by the heater.

Yves.

Do you mean this?

14th June 2007, 06:29 PM	#1
pwan diyAudio Member Join Date: Apr 2006 Location: Earth	EL84 as both driver and output stage. Hello I have tons of EL84/6BQ5/6P14P around. I wonder if any one here come across a SE schematic that use EL84 on both driver and output stage ? Thanks !

14th June 2007, 07:05 PM	#2
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	The EL84 is sooooo easy to drive that I can only ask, "Why?" Use the second one in parallel for double the power, then drive 'em with something more appropriate (i.e., less power delivery, which is useless, but better linearity, which is useful). __________________ "...we stumble and get up, we are sad, confident, insecure, feel loneliness and joy and love. There is nothing more; but I want nothing more.” - Christopher Hitchens 1949-2011

14th June 2007, 07:18 PM	#4
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	50 in parallel per channel. Or just use two and send me the rest. __________________ "...we stumble and get up, we are sad, confident, insecure, feel loneliness and joy and love. There is nothing more; but I want nothing more.” - Christopher Hitchens 1949-2011

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Miniwatt diyAudio Member Join Date: Nov 2004 Location: Den Haag

14th June 2007, 07:28 PM	#7
Yvesm diyAudio Member Join Date: Jul 2004 Location: Ardeche	A quick check with Tube CAD. Triode connected, 250V B+, 10K anode load resistor and bypassed 600 ohms in the cathode should produce near 23dB gain. Just enough to drive another one. Not so hi anode current (10mA) but still 4,5W absorbed by the heater. Yves.

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