Can anyone sujest a good operating point for the PL84

Shoog · 15th June 2005, 05:29 PM

Hi there,
I am thinking of building the following circuit

http://diyparadise.com/simpleel84.html

but I was thinking of substituting PL84's for the EL84. Yes I know that the PL84 is really a EL86 so I will have to change the operating point. I understand the EL86 will work at lower voltages and higher currents - can anyone sujest a good operating point for this one.

Shoog

Yvesm · 15th June 2005, 07:15 PM

Hi Shoog.

I've a data sheet which suggests this values for PP mode:

VA = 250
VG2 = 200
Rl P to P = 5K5
RK = 150 (common)
Ia = 2x50 to 2x55mA
Ig2 = 2x2 to 2x13mA
Po = 18.5W
DHT =4.5%

If you use UL screen feed, you'll probably need to increase the bias a bit to restore 50mA plate current per tube at iddle.

Hope that helps

Yves.

Shoog · 15th June 2005, 09:07 PM

Thanks for that.
I will probably be running this in Triode mode.

Shoog

Yvesm · 16th June 2005, 05:23 AM

Quote:

I will probably be running this in Triode mode.

If so, look here:

http://www.tubes.mynetcologne.de/roe..._triode_e.html

Have fun,

Yves.

15th June 2005, 05:29 PM	#1
Shoog diyAudio Member Join Date: Aug 2002 Location: Eire	Can anyone sujest a good operating point for the PL84 Hi there, I am thinking of building the following circuit http://diyparadise.com/simpleel84.html but I was thinking of substituting PL84's for the EL84. Yes I know that the PL84 is really a EL86 so I will have to change the operating point. I understand the EL86 will work at lower voltages and higher currents - can anyone sujest a good operating point for this one. Shoog

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15th June 2005, 07:15 PM	#2
Yvesm diyAudio Member Join Date: Jul 2004 Location: Ardeche	Hi Shoog. I've a data sheet which suggests this values for PP mode: VA = 250 VG2 = 200 Rl P to P = 5K5 RK = 150 (common) Ia = 2x50 to 2x55mA Ig2 = 2x2 to 2x13mA Po = 18.5W DHT =4.5% If you use UL screen feed, you'll probably need to increase the bias a bit to restore 50mA plate current per tube at iddle. Hope that helps Yves.

15th June 2005, 09:07 PM	#3
Shoog diyAudio Member Join Date: Aug 2002 Location: Eire	Thanks for that. I will probably be running this in Triode mode. Shoog

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