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Old 12th August 2013, 08:00 PM   #1
KJ5555 is offline KJ5555  United States
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Default Unidentified Audio Transformer

I need help identifying this transformer. It is used in the circuit board of the Altec Lansing 1590E Amplifier. Any ideas?

Thank you!
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Old 12th August 2013, 09:41 PM   #2
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This transformer is the output driver transformer. Split common primary and independent secondaries.
Take a look at the schematic Download the Altec Lansing 1590-E service manual for free - Hifi Manuals
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Old 13th August 2013, 12:42 PM   #3
KJ5555 is offline KJ5555  United States
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Yes but I need more information on number of turns, impedance, etc. so I was hoping to identify the manufacturer and part number.
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Old 13th August 2013, 02:53 PM   #4
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Altec made it.

You can empirically determine the turns ratio and so the impedance ratio. Insert an AC voltage on one of the windings and measure the voltage on the others.

Number of turns might be estimated by determining the gauge of the wire properly and then using a Kelvin connected meter to find the DCR and figure the resistance per unit length to get an answer.

I think I asked in another thread, but why are you going to this length on an old design like this??
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Last edited by bear; 13th August 2013 at 03:01 PM.
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Old 13th August 2013, 03:43 PM   #5
KJ5555 is offline KJ5555  United States
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I am very determined.

I was hoping that I could find a similar performing transformer instead of having to make my own measurements to get a custom...
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Old 13th August 2013, 04:11 PM   #6
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yes, but determined to do what?

trying to help, but it's unclear what your goal is!
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Old 13th August 2013, 04:48 PM   #7
KJ5555 is offline KJ5555  United States
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I am trying to build this amplifier from scraps.
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Old 13th August 2013, 10:34 PM   #8
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You can buy them used on ebay for as little as $100!

Or a 1594a/b which is slightly lower in power

Besides the circuit is really not so great. There is merit to the output iron, but not in that circuit! The amp was designed at a time when there were no high power complementary devices. So for PA/SR work, was useful to use an output transformer for reliability and to drive "70v" commercial systems.

Perhaps if you would share more about your ultimate goals with this amp I could help you out??

_-_-

PS. junk box scraps, or scrapped 1590 chassis?? Big difference.
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Old 13th August 2013, 10:40 PM   #9
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Quote:
Originally Posted by bear View Post
You can buy them used on ebay for as little as $100!

Or a 1594a/b which is slightly lower in power

Besides the circuit is really not so great. There is merit to the output iron, but not in that circuit! The amp was designed at a time when there were no high power complementary devices. So for PA/SR work, was useful to use an output transformer for reliability and to drive "70v" commercial systems.

Perhaps if you would share more about your ultimate goals with this amp I could help you out??


_-_-

PS. junk box scraps, or scrapped 1590 chassis?? Big difference.
Yes, the frequency response and stability does leave a lot to be desired.
Why not model on an Amercron DC500 now that uses normal technology but belt and braces plus an excellent design with a frequency response of DC to 22kHZ +-2dB
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Last edited by JonSnell Electronic; 13th August 2013 at 10:41 PM. Reason: Mistake
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