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Problems with cathodyne
Problems with cathodyne
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Old 15th January 2006, 10:40 AM   #1
tAB is offline tAB  Hungary
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Default Problems with cathodine

Hi!

I built a driver for PL500. The schema and the pictures of the cathodine signals is in the attachment. The upper side of cathodine has a big distortion

I was tried with other tube, but nothing changed.

If I pull out the second ECC85, the two signal is full symmetric.

What's the problem?
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File Type: jpg csoves4k.jpg (90.9 KB, 295 views)
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Old 15th January 2006, 10:52 AM   #2
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Hi,

Some first impressions - R10, R13, C2 and C3 are all too big.

You have 1M gridleaks on the second ECC85 - make them 100K to 220K and C2, C3 0.1uF and try again.
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Old 15th January 2006, 11:51 AM   #3
tAB is offline tAB  Hungary
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Ok. Thx. I'll try it now.
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Old 15th January 2006, 12:36 PM   #4
tAB is offline tAB  Hungary
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I tried it.

I soldered a 180k paralell with the two 1M, and replaced the 1uF with a 100n. On the picture, you can see that the anode signal have biger distortion.
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Old 15th January 2006, 12:59 PM   #5
SY is offline SY  United States
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Clearly, the last stage is the issue- you're drawing grid current. Check wiring first. Do a DC voltage map (real voltages, not sims).
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Old 15th January 2006, 04:21 PM   #6
tAB is offline tAB  Hungary
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I checked the wiring, about 10 times

On the pic, you can see the real voltages with red, I think that's OK.

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Old 15th January 2006, 04:55 PM   #7
SY is offline SY  United States
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Is that 137V plate to cathode or plate to ground?
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Old 15th January 2006, 05:12 PM   #8
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137V plate to cathode. Voltage of VM3.
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Old 16th January 2006, 12:31 PM   #9
jane is offline jane  Norway
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I agree with SY, you are drawing grid current in the last stage..
What is the voltage over R14, about 2.3v?
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Old 16th January 2006, 09:05 PM   #10
tAB is offline tAB  Hungary
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Quote:
Originally posted by jane
I agree with SY, you are drawing grid current in the last stage..
And what can I do?

Quote:
What is the voltage over R14, about 2.3v?
I'll check it tomorrow.


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