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Quad 63 (and later) Delay Line Inductors
Quad 63 (and later) Delay Line Inductors
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Old 17th June 2021, 04:17 PM   #411
jan.didden is offline jan.didden  Europe
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Yes I saw your posts.
You know, I turn up the variac to get 'only' about +/-1500V for testing, instead of the full +/-2400V.
You really have to be careful not getting the idea that 1500V is much lower and therefor somehow not as dangerous.

Jan
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Old 17th June 2021, 04:19 PM   #412
Hans Polak is offline Hans Polak  Netherlands
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Here in cyan is the result of an on axis recording at 1 meter distance.

Quad 63 (and later) Delay Line Inductors

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Old 17th June 2021, 06:05 PM   #413
jan.didden is offline jan.didden  Europe
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Thanks Hans, I was more concerned with the low end.
I guess I should roll of the low end to prevent excessive excursion of the foil?

Jan

Last edited by jan.didden; 17th June 2021 at 06:09 PM.
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Old 17th June 2021, 08:53 PM   #414
Hans Polak is offline Hans Polak  Netherlands
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No I don't think you have to roll off anything at LF.
The ESL will do the roll off by itself.

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Old 17th June 2021, 09:12 PM   #415
martin clark is offline martin clark  Europe
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Doing so at LF may usefully increase power handling/avoidance of a strike though, overall?

Settling for 40hz, say, vs a DD amp's ability to pin the thing at ELF, simply from a recording transient or similar.

(from an amateur just watching this with interest ...)
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Old 18th June 2021, 03:42 AM   #416
1audio is offline 1audio  United States
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Quad 63 (and later) Delay Line Inductors
For years I have used a 6 dB roll off for 63s. Always with a sub. If you look at the typical power distribution for music.( except hip hop) it's centered around 100 Hz. Removing the bass demands can significantly increase the max output. Also the panels have a resonance around 80 Hz as I remember that would be good to avoid.
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Old 18th June 2021, 03:43 AM   #417
1audio is offline 1audio  United States
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Roll off at 100 Hz. Needs a good sub.
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Old 18th June 2021, 06:40 AM   #418
jan.didden is offline jan.didden  Europe
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Quote:
Originally Posted by martin clark View Post
Doing so at LF may usefully increase power handling/avoidance of a strike though, overall?

Settling for 40hz, say, vs a DD amp's ability to pin the thing at ELF, simply from a recording transient or similar.

(from an amateur just watching this with interest ...)
That was my thinking.

@Hans: is that natural rolloff caused by the xformers and xover parts? I will not go through that of course.

Jan
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Old 18th June 2021, 10:15 AM   #419
Hans Polak is offline Hans Polak  Netherlands
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Jan,
In the sim the transformers and xovers do not roll off until very, very low and they do not harm anything at all.
This must be very close to the real thing IMO.

Hans
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Old 18th June 2021, 10:21 AM   #420
jan.didden is offline jan.didden  Europe
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OK, thanks!

Jan
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