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 Post subject: Re: Heathkit W-5M amplifier rebuild
PostPosted: Mar Mon 12, 2018 3:55 am 
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Location: near ST Louis Mo 62002
The original laminations have nickel in them , which helps with the frequency response .

Mark

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 Post subject: Re: Heathkit W-5M amplifier rebuild
PostPosted: Mar Sat 28, 2020 11:29 pm 
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I know this is an old thread but I am using the same output transformer as you did in my w5m and I had an oscillation when I put it together I disconnected the 16 ohm tap and it whet away I saw the only change you ended up making was to change the 270 ohm resistors between the screen taps and the screens of the KT-66s with 1K resistors I was just checking those resistors and one of mine was fried should I replace them with 1k resistors thanks for any help


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 Post subject: Re: Heathkit W-5M amplifier rebuild
PostPosted: Mar Sun 29, 2020 10:33 am 
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Location: near ST Louis Mo 62002
Reverse the plate connections along with the screen connections ( the phase of the replacement transfomer is opposite f the original ) causing it to oscillate .

Yes change the 270 ohms to 1K .

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 Post subject: Re: Heathkit W-5M amplifier rebuild
PostPosted: Mar Tue 31, 2020 3:46 am 
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Thank you I will try this as soon as I can get my hands on those resistors


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 Post subject: Re: Heathkit W-5M amplifier rebuild
PostPosted: Apr Tue 07, 2020 5:35 pm 
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That did it everything is working now


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 Post subject: Re: Heathkit W-5M amplifier rebuild
PostPosted: Apr Tue 07, 2020 6:12 pm 
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Joined: Jul Fri 18, 2008 10:02 am
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Location: near ST Louis Mo 62002
Glad to help out .

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