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EL84 as both driver and output stage.
EL84 as both driver and output stage.
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Old 14th June 2007, 05:29 PM   #1
pwan is offline pwan  United Kingdom
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Default 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 !
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Old 14th June 2007, 06:05 PM   #2
SY is offline SY  United States
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EL84 as both driver and output stage.
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).
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Old 14th June 2007, 06:10 PM   #3
pwan is offline pwan  United Kingdom
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Default Re: EL84 as both driver and output stage.

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!
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Old 14th June 2007, 06:18 PM   #4
SY is offline SY  United States
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EL84 as both driver and output stage.
50 in parallel per channel. Or just use two and send me the rest.
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Old 14th June 2007, 06:23 PM   #5
Miniwatt is offline Miniwatt  Netherlands
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Old 14th June 2007, 06:26 PM   #6
pwan is offline pwan  United Kingdom
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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 !!
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Old 14th June 2007, 06:28 PM   #7
Yvesm is offline Yvesm  France
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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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Old 14th June 2007, 08:07 PM   #8
KaDe is offline KaDe  Germany
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Default EL84 line driver

Hello
The EL84 can work as line driver also.
I have attached a Vollmer pre-amp circuit with EL84 transformer output for you.
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File Type: jpg vollmer-188.jpg-klein.jpg (97.2 KB, 659 views)
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Old 14th June 2007, 08:28 PM   #9
Miniwatt is offline Miniwatt  Netherlands
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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
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Old 14th June 2007, 11:47 PM   #10
pwan is offline pwan  United Kingdom
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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?
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File Type: jpg tmpel84drive_01.jpg (29.2 KB, 661 views)
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