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Old 13th January 2013, 01:07 PM   #391
Pano is online now Pano  United States
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Ale, you're killing me! I wanted to be in there first with the 4P1L pentode driving the 4P1L in triode mode. Alas, it took a month for my tubes to arrive, then I was out of town for a week. Grrr.....

So I'll be following in your footsteps on this path.
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Old 13th January 2013, 01:52 PM   #392
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Originally Posted by mogliaa View Post
Improved Pentode driver by adding a parallel resistor to the gyrator output and managed to halve distortion: THD=0.27% @ 200Vpp, 4P1L is a great driver candidate indeed!
4P1L Pentode Driver (Test 2) | Bartola Valves

Ale
Hi,

what is the gain of Pentode driver 4P1L? Operation point is 256V/-3.6V?
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Old 13th January 2013, 02:13 PM   #393
mogliaa is offline mogliaa  United Kingdom
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close to 150...

@ Pano, I just did some test, you can take it from here...
Cheers,
Ale
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Old 13th January 2013, 03:54 PM   #394
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I will, Ale, I will. This week.
Thanks for the gain info in pentode mode. Far more than I'll ever need to drive the output stage.
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Old 13th January 2013, 04:06 PM   #395
mogliaa is offline mogliaa  United Kingdom
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Good, keep us posted!
Gain is determined by the RL in parallel with the 4P1L when loaded with the gyrator (or CCS). It may be a bit high, you can reduce it by reducing the RL, but distortion will increase...
Ale
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Old 13th January 2013, 06:04 PM   #396
RajkoM is offline RajkoM  Bosnia and Herzegovina
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Hi Anatolij and others.
Trying to find a cheaper, but good, pentode driver as a replacement for my existing C3g, Im here.

Based on Anatloij first post in this thread I simulated this 4P1L pentode driver. Works good to me.

I have no experience with 4P1L or another DH pentode. My plan is connect pin 1 and 7 to 4.2 Vdc then LED string from pin 8 to ground.
Correct?

Thanks to Ale for very good 4P1L pentode spice model.

Rajko
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Old 13th January 2013, 07:05 PM   #397
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Hi Raiko;

looks doable, except I personally would reconfigure your CCS into gyrator, for better regime stability of anode voltage.
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Old 13th January 2013, 07:13 PM   #398
RajkoM is offline RajkoM  Bosnia and Herzegovina
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Hi Raiko;

looks doable, except I personally would reconfigure your CCS into gyrator, for better regime stability of anode voltage.
Tnx Anatolij
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Old 14th January 2013, 12:04 PM   #399
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Lightbulb Max Voltage?

I'm having some trouble with my PSU. Trouble is the B+ voltage is too high (I think). Even with 80mA of draw it's up over 300V. Unloaded about 320V.
How high a voltage can the 4P1L take? I was thinking not going above 250V on the B+.

Still working with it, trying to insert some R into the line to drop the voltage. The series resistor would dissipate a lot of power. Maybe a 15W light bulb?
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Old 14th January 2013, 01:06 PM   #400
palmas is offline palmas  Portugal
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You should pay atention to the anode voltage, 250V should be OK.
The B+ you can have much more (400V, 500V...) depends on the anode resistor or CCS or whatever you're using.
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