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#26 pre amp
#26 pre amp
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Old 20th March 2013, 05:43 PM   #2631
vgeorge is offline vgeorge  Greece
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#26 pre amp
What is the voltage drop on the 2,7K?
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Old 20th March 2013, 05:44 PM   #2632
merlin el mago is offline merlin el mago
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Quote:
Originally Posted by stajo View Post
To protect AZ1 maybe. But where do you see it?


told me Rod Coleman

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What is the last 2,7k/100nF for?

2K7 to low the voltage 100nF not used
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Old 20th March 2013, 05:45 PM   #2633
stajo is offline stajo  Sweden
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#26 pre amp
If you have 306 something B+ you must have put something larger as the first cap then 100 nF. Check that, or remove it as earlyer said. Then you need a cap after the 2,7k. 100 uF:is I would say worx.
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Old 20th March 2013, 05:48 PM   #2634
merlin el mago is offline merlin el mago
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Quote:
Originally Posted by vgeorge View Post
What is the voltage drop on the 2,7K?
I have removed the CCS+Gyrator, I guess I need a dummy load in place of Gyrator and tube to measure, wich value?

Last edited by merlin el mago; 20th March 2013 at 05:53 PM.
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Old 20th March 2013, 05:52 PM   #2635
merlin el mago is offline merlin el mago
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Quote:
Originally Posted by stajo View Post
If you have 306 something B+ you must have put something larger as the first cap then 100 nF. Check that, or remove it as earlyer said. Then you need a cap after the 2,7k. 100 uF:is I would say worx.
1rst 100nF removed, I don't have 100uF I have 220uF could I use after the 2K7?
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Old 20th March 2013, 05:55 PM   #2636
stajo is offline stajo  Sweden
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#26 pre amp
Quote:
Originally Posted by merlin el mago View Post
I have removed the CCS+Gyrator, I guess I need a dummy load in place of Gyrator and tube to measure, wich value?
for 300 V 5 mA 60k
for 250 V 5 mA 50k
for 200 V 5 mA 40k
for 150 V 5 mA 30k

Last edited by stajo; 20th March 2013 at 05:58 PM.
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Old 20th March 2013, 05:55 PM   #2637
stajo is offline stajo  Sweden
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#26 pre amp
Quote:
Originally Posted by merlin el mago View Post
1rst 100nF removed, I don't have 100uF I have 220uF could I use after the 2K7?
Yes you can.
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Old 20th March 2013, 05:58 PM   #2638
vgeorge is offline vgeorge  Greece
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#26 pre amp
Update your simulation on PSUD with the new data. Calculate 6mA current draw for the tube. You will find the correct resistor value.
Put what Stajo suggested as a start value. You will have to get around 150v on your load.
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Last edited by vgeorge; 20th March 2013 at 06:01 PM.
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Old 20th March 2013, 06:16 PM   #2639
merlin el mago is offline merlin el mago
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Using 2k7 for R1 changing last cap for 220uF with a dummy load of 30k psud gives 229V?

Last edited by merlin el mago; 20th March 2013 at 06:19 PM.
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Old 20th March 2013, 06:18 PM   #2640
merlin el mago is offline merlin el mago
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psud simulation
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