EF95-EL84 single end integrated amplifier - diyAudio
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Old 5th March 2010, 08:20 AM   #1
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Default EF95-EL84 single end integrated amplifier

This class A single end tube amplifier we created makes use of classic pentode tube, EF95/5654/WE403B/6J1 in triode connection to drive EL84/6AQ5 in pentode connection with 5Y3 full wave rectifier. The output power is 4W and can easily drive full range speakers like Mark Audio. The parts and components are seriously selected and the amplifier is manufactured by Twin Audio. This compact size with elegant style is very suitable for living home.

Tony.

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Last edited by Jason; 6th March 2010 at 02:00 AM. Reason: Updated first sentence to correct description of amplifier on Tony's request
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Old 5th March 2010, 08:23 AM   #2
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Tony,

You are getting 4W / channel out of a triode strapped EL84?

dave
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Old 5th March 2010, 09:20 AM   #3
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Quote:
Originally Posted by planet10 View Post
Tony,

You are getting 4W / channel out of a triode strapped EL84?

dave
Hi dave,

Yes. The plate voltage of EL84 is 250V, 48mA plate current and with load resistance 5K ohms. The power output is 4W for each channel under class A single end amplifier circuit.

Tony.

Last edited by Musik007; 5th March 2010 at 09:27 AM.
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Old 5th March 2010, 09:33 AM   #4
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Can also use 6BQ5 which is very similar to EL84. EL84 and 6BQ5 are power-amplifier pentodes designed for use in radio receivers, televisions and high fidelity amplifiers in the past.
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Old 5th March 2010, 09:38 AM   #5
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Tony,

4W in triode?

I have probably a 100+ EL84, 6BQ5, 6P14P, EL84M....

I have a 3.8 W EL84 pentode (290V plate, not so much current), and a stunning 3.2 W Class A triode PP.

dave
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Old 5th March 2010, 09:51 AM   #6
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Hey Tony,
You will not even get 2W/ch from your amp so you might have modified truth a little.
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Old 5th March 2010, 10:09 AM   #7
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Quote:
Originally Posted by planet10 View Post
Tony,

4W in triode?

I have probably a 100+ EL84, 6BQ5, 6P14P, EL84M....

I have a 3.8 W EL84 pentode (290V plate, not so much current), and a stunning 3.2 W Class A triode PP.

dave
dave,

It is 4W in pentode.

EL84 is a good audio tube and can keep more.

The plate voltage of EL84 is not so high, 250V is good enough.

Tony.
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Old 5th March 2010, 10:17 AM   #8
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Quote:
Originally Posted by revintage View Post
Hey Tony,
You will not even get 2W/ch from your amp so you might have modified truth a little.
Hi Lars,

The power output of the power tubes depend on plate voltage and load resistance.

Thanks.
Tony.
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Old 5th March 2010, 05:02 PM   #9
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Specification:
AC Input: 220V
Power Output: 2 x 4W
Output Impedance: 4 & 8 ohms
Frequency Response: 20Hz-25KHz
Power Consumption: 60W
Dimension: 280W x 220D x 180H mm
N.W.: approx. 6KG
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Old 5th March 2010, 09:17 PM   #10
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Quote:
Originally Posted by Musik007 View Post
It is 4W in pentode.
That makes sense. The way that it was worded in an earlier post it seemed you were running them triode, but you must have meant the EF95. My diy amps use triode strapped EF86

dave
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