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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

SAE Preamplifier Equalizer Mark IXB
SAE Preamplifier Equalizer Mark IXB
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Old 14th November 2019, 12:37 AM   #11
rayma is offline rayma  United States
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Originally Posted by audiomachines View Post
yes I did do the math, but you need to also know the DCR value of the inductor
so you could estimate the Q of the LC ckt
Measure the wire gauge, then calculate the coil resistance from the estimated wire length.
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Old 14th November 2019, 06:54 PM   #12
llwhtt is offline llwhtt  United States
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The Service Manual lists no inductor info other than the frequency that it is used.

Craig
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Old 15th November 2019, 05:17 AM   #13
PRR is offline PRR  United States
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> DCR value of the inductor so you could estimate the Q

You know C and F, which gives L. Using F and either C or L you can compute Q. We don't know the design Q but if this is a 10-band I would start with 1.3 to 2.8. Comparison of peak boost to factory spec may refine this value.
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Old 15th November 2019, 12:57 PM   #14
audiomachines is offline audiomachines  Philippines
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it is a 7 band eq with non ISO center freq 40hz, 120hz, 320hz, 960hz, 2500hz, 7500hz, 15khz i love the sound of inductor eqs similar to those manley passive eq, pultec amd rupert neve designs for me thisnis the real tone control before the simulated inductor become mainstream aka gyrators
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Old 19th November 2019, 05:05 PM   #15
Rolox is offline Rolox
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Originally Posted by audiomachines View Post
Hi all,

Anybody knows the inductor values of an SAE Preamp Mark IXB eq section? or service manual, I am currently restoring one and i am trying to wound my own coil using EPCOS P26 cores. Any info would be highly appreciated.Thank you.
I used to have a Mark 1B fully restored. Still regret having sold it
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Old 27th November 2019, 05:47 PM   #16
llwhtt is offline llwhtt  United States
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If I hadn't blown up my LCR meter, forgot to discharge a capacitor, I would take my IXB apart and measure the inductors for you.

Craig
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Old 29th November 2019, 03:09 AM   #17
Mark Tillotson is offline Mark Tillotson
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Originally Posted by audiomachines View Post
it is a 7 band eq with non ISO center freq 40hz, 120hz, 320hz, 960hz, 2500hz, 7500hz, 15khz i love the sound of inductor eqs similar to those manley passive eq, pultec amd rupert neve designs for me thisnis the real tone control before the simulated inductor become mainstream aka gyrators

Gyrators simulate ideal, linear inductors, which is a struggle for real inductors to achieve. I'd worry you think there's some magic present, when the magic is in the performance of gyrators, cheaper, better, more precise.
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Old 29th November 2019, 11:14 PM   #18
llwhtt is offline llwhtt  United States
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My friend worked at SAE at the time the IXB was designed and he designed the inductors. I've asked him if it's OK to give you his email address.

Craig
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Old 3rd December 2019, 07:41 PM   #19
llwhtt is offline llwhtt  United States
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audiomachines,

I sent you the email address of the man that designed the inductors in IXB.

Craig
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