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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment.

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Old 30th Aug 2021, 2:44 pm   #1
radiozero
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Default Murphy 618 Tx

Hi. I'm confused with how the AE Current circuit is actually wired up. In the schematic, one side of the variometer is connected to ground through the primary of T4, a toroidial transformer, which secondary feeds the AE current meter. But, as actually wired up, one side of the variometer is connected to a 6BA bold that holds down and runs through (axially) T4. That is making that bolt the primary for T4. But I'm having a hard time believing this circuit could possibly work. Please enlighten me. Thank you. Rich
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Old 30th Aug 2021, 3:47 pm   #2
ms660
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Default Re: Murphy 618 Tx

https://www.electronics-tutorials.ws...ansformer.html

Lawrence.
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Old 30th Aug 2021, 5:57 pm   #3
radiozero
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Default Re: Murphy 618 Tx

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Originally Posted by ms660 View Post
Hi. Thanks. I had a current transformer clipped onto one of my mains pigtails. I had no problem seeing that as kosher. But, it just did not look right when I saw the same thing with the Murphy 618. But it is kosher. We live and learn.
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Old 14th Sep 2021, 4:45 pm   #4
AndyWright
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Default Re: Murphy 618 Tx

Quote:
Originally Posted by radiozero View Post
Quote:
Originally Posted by ms660 View Post
Hi. Thanks. I had a current transformer clipped onto one of my mains pigtails. I had no problem seeing that as kosher. But, it just did not look right when I saw the same thing with the Murphy 618. But it is kosher. We live and learn.
I've just acquired a Murphy 618 tx today. I don't suppose you have any spare connectors?

Cheer

Andy
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