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Old 1st March 2011, 02:44 AM   #1
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Default Use CL-90 to slow 5Y3?

Can I put a CL-90 in the 5V filiment supply to reduce start up voltage spike?

The voltage doesn't get too bad. It goes to about 360V before it settles down to the 280V opperating point.

I would feel better if I could keep it under 300V.
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Old 1st March 2011, 03:29 AM   #2
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Put the CL90 between the filament and the PSU filter. That way, the 1st filter cap. is not an initial dead short.
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Old 1st March 2011, 06:29 PM   #3
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Thanks Eli,

Attached are three configurations of the PSU.

The first is the way it is now.

The second is with the CL-90 added after the filament. If I add it here keep or remove the 150 ohm before C1?

The third was what I was asking about. The CL-90 added to the filament supply.

I hope my objective was clear. I want the other tubes to heat up before the 5Y3 comes up to full output.

The CL-90 is only rated a 120V. It's ok to put after the filament?
Attached Files
File Type: pdf CL-90b.pdf (17.1 KB, 49 views)
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Old 2nd March 2011, 12:58 AM   #4
jjman is offline jjman  United States
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I think there are "equivalent" tubes to the 5y3 that use an indirectly heated cathode where the rectifier's output comes up slower?
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Old 2nd March 2011, 01:27 AM   #5
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Quote:
Originally Posted by Troncones View Post
Thanks Eli,

Attached are three configurations of the PSU.

The first is the way it is now.

The second is with the CL-90 added after the filament. If I add it here keep or remove the 150 ohm before C1?

The third was what I was asking about. The CL-90 added to the filament supply.

I hope my objective was clear. I want the other tubes to heat up before the 5Y3 comes up to full output.

The CL-90 is only rated a 120V. It's ok to put after the filament?

Yup, the middle schematic is what you need. Don't worry about the new CL90, as it will be just fine. The potential difference across the 2 leads is well below the 120 V. limit.

If adding a thermistor doesn't slow things down enough, switch from the 5Y3 to a 6087 or a 6106. Those 2 are 5Y3 variants with cathode sleeves.
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Old 2nd March 2011, 02:13 AM   #6
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Thanks Eli.
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Old 2nd March 2011, 05:39 AM   #7
Jaap is offline Jaap  Netherlands
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Quote:
Originally Posted by Troncones View Post
Can I put a CL-90 in the 5V filiment supply to reduce start up voltage spike?

The voltage doesn't get too bad. It goes to about 360V before it settles down to the 280V opperating point.

I would feel better if I could keep it under 300V.
Copy the powersupply of Pete Millett's engineers amp: DCPP Amp (perhaps with minor changes)
and all your problems will be solved. You can use the empty hole in your chassis for a nice glowtube.
amen
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Old 2nd March 2011, 02:35 PM   #8
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Thank you Jaap. Some day I will try a SS PSU. For now I want to use tubes.

No chassis yet, it's still on a board. I want to try a VR tube at some point. I haven't designed an amp that could use one.
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