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Thread: Model 14 Rebuilding L pad ...confused on what version to use

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  1. #1
    Junior Hostboard Member ttalmage1's Avatar
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    Cool Model 14 Rebuilding L pad ...confused on what version to use

    I have disassembled a pair of Model 14s I bought last winter....When I pulled the L pads I noticed that both had
    the duel inductor coils. The differences between the two was that pad A had two (2) factory 6 ohm capacitors
    wired side by side in parallel .. the other B pad had only one 6 ohm. Both pads had the 2 ohm capacitor and the 470
    ohm capacitor.

    The other difference between the L pads is the A pad (with the two 6 ohm capacitors) has a 7.5 ohm resistor instead
    of the 10 ohm on pad B.

    Should I rebuild as pad A with a total capacitance uf =12 ...replace with a 10 uf seen in most drawings or use the pad B
    6uf configuration?? Finally ... the resistor should I use the 7.5 or 10 ohm?

    Thanks,
    Trent2t

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    Hostboard Member xinu's Avatar
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    Re: Model 14 Rebuilding L pad ...confused on what version to

    The terminology you are using to describe the M14 crossover doesn't make any sense to me.

    I suggest using your favourite search engine and enter "altec model 14 crossover".

    BTW -Capacitance is labeled and measured in farads, Resistance is labeled and measured in ohms.

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    Junior Hostboard Member ttalmage1's Avatar
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    Re: Model 14 Rebuilding L pad ...confused on what version to

    Quote Originally Posted by xinu View Post
    The terminology you are using to describe the M14 crossover doesn't make any sense to me.

    I suggest using your favourite search engine and enter "altec model 14 crossover".

    BTW -Capacitance is labeled and measured in farads, Resistance is labeled and measured in ohms.
    Sorry... two pads ....all caps are 6uf and 2 uf not ohms.... rookie error!!!

    Still need questions answered .....

    The other difference between the L pads is the A pad (with the two 6 uf capacitors) has a 7.5 ohm resistor instead
    of the 10 ohm on pad B.

    Should I rebuild as pad A with a total capacitance uf =12 ...replace with a 10 uf seen in most drawings or use the pad B
    6uf configuration?? Finally ... the resistor should I use the 7.5 or 10 ohm?

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    Senior Hostboard Member mah's Avatar
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    Re: Model 14 Rebuilding L pad ...confused on what version to

    Schematic(1500Hz): Analysing Model 14 crossover

    Ignore the rest of the post.
    Opinion is only as valid as its verifiable supporting evidence.

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    Senior Hostboard Member Earl K's Avatar
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    Re: Model 14 Rebuilding L pad ...confused on what version to

    According to Richard C. there were 2 or 3 variants made of the M14 crossover .

    Here are 2 of them ( the woofer & horn are represented in these pics as resistor & coil values > so don't get confused when you can't find them in your own network ) .

    Choose one type and go from there .

    ( Right-Click & Open the pics in new tabs to see full-size for readable text )

    2

    1

    The third type appears to be this one ( which Mah provided the link for ).

    1



  6. #6
    Junior Hostboard Member ttalmage1's Avatar
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    Re: Model 14 Rebuilding L pad ...confused on what version to

    Quote Originally Posted by Earl K View Post
    According to Richard C. there were 2 or 3 variants made of the M14 crossover .

    Here are 2 of them ( the woofer & horn are represented in these pics as resistor & coil values > so don't get confused when you can't find them in your own network ) .

    Choose one type and go from there .

    ( Right-Click & Open the pics in new tabs to see full-size for readable text )

    2

    1

    The third type appears to be this one ( which Mah provided the link for ).

    1


    Thanks!!.... recapping this weekend...

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