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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 13th November 2019, 07:43 AM   #1
audiomachines is offline audiomachines  Philippines
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Default SAE Preamplifier Equalizer Mark IXB

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.
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Old 13th November 2019, 05:38 PM   #2
RJM1 is offline RJM1  United States
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Inductors usually do not go bad. Especially in low current applications. What makes you think that they need to be replaced?
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Old 13th November 2019, 09:25 PM   #3
audiomachines is offline audiomachines  Philippines
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well this is a 40 year old preamplifier. my multimeter says open even my LCR meter say so
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Old 13th November 2019, 11:01 PM   #4
Mark Tillotson is offline Mark Tillotson
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What is it like? Could you count the turns and measure the AL value(*) for its core? Or reuse its core, come to that.
(*) AL value [Encyclopedia Magnetica]
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Old 13th November 2019, 11:11 PM   #5
rayma is online now rayma  United States
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Quote:
Originally Posted by audiomachines View Post
my multimeter says open even my LCR meter say so
Same in both channels? It's very unlikely the inductor is bad.
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Old 14th November 2019, 12:04 AM   #6
audiomachines is offline audiomachines  Philippines
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Well somebody did messed up the board before i got the preamplifier, He tried to clean it with a brush not knowing that the inductors are torroid wound with a very fine wire (AWG 37), Yes it would be possible to count windings but its gonna take a long long time (the inductors were the torroid type) plus i dont have access to a torroid winder that is why i am using epcos pot cores. Most of these LC base eq (pre-Gyrator designs) are using 5-3 Henry on the 30z-50Hz band thats a lot of winding to cound. I did try to wound an inductor on a EE25 core with AL values of 1950 i got 3.5H for a 1400 turns gapped due to the adhesive.
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Old 14th November 2019, 12:07 AM   #7
rayma is online now rayma  United States
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Then if only one channel is damaged, measure the inductor in the good channel,
and replace both inductors with new ones. Don't try to wind 1400 turns yourself.
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Old 14th November 2019, 12:21 AM   #8
audiomachines is offline audiomachines  Philippines
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Quote:
Originally Posted by rayma View Post
Then if only one channel is damaged, measure the inductor in the good channel,
and replace both inductors with new ones. Don't try to wind 1400 turns yourself.
i got a motorized winder with counter but not a torroid winder well all the inductor were damage
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Old 14th November 2019, 12:29 AM   #9
rayma is online now rayma  United States
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Quote:
Originally Posted by audiomachines View Post
i got a motorized winder with counter but not a torroid winder well all the inductor were damage
If it's a simple LC circuit, read the associated capacitor value and the frequency on the front panel.
Then use the formula: f = 1 / ( 2 x Pi x sqrt (L x C) ) to find L.
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Old 14th November 2019, 12:33 AM   #10
audiomachines is offline audiomachines  Philippines
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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
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