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What's the air gap in Lundahl PP interstages?

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Posted on September 25, 2016 at 15:23:21
andy evans
Audiophile

Posts: 2895
Joined: October 20, 2000
I have a pair of LL1635PP that I'd like to use for SE 01A at 3mA. Is it possible the PP version is gapped for 3mA?

Same with the LL1660PP, and LL1689PP, which I also have. Any chance either of these would be gapped for 3mA?

 

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RE: What's the air gap in Lundahl PP interstages?, posted on September 26, 2016 at 16:58:01
KevinC
Manufacturer

Posts: 2893
Location: NC
Joined: April 19, 2001
I suspect that 3mA will work for an LL1635, but I don't know off-hand what the PP gap is set for. I will have to get back to the office to look the LL1635 data up. The gap for LL1660, LL1692A, LL1671, and LL1677 in the PP version is set for 5mA.

Kevin Carter
K&K Audio
www.kandkaudio.com

 

Thanks - I'd like to know the LL1635, posted on October 2, 2016 at 06:36:49
andy evans
Audiophile

Posts: 2895
Joined: October 20, 2000
Thanks for looking this up. Andy

 

RE: Thanks - I'd like to know the LL1635, posted on October 2, 2016 at 16:37:42
KevinC
Manufacturer

Posts: 2893
Location: NC
Joined: April 19, 2001
It turns out that the LL1635 gap is just obtained by pushing the two half C-cores together without a spacer and banding cores and frame together. I'd guess that the gap obtained that way is nominally something like 2mA, but could be more or less.

Kevin Carter
K&K Audio
www.kandkaudio.com

 

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