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Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders.

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Old 9th Jan 2019, 6:43 pm   #21
stuarth
Heptode
 
Join Date: Feb 2010
Location: Heysham, Lancashire, UK.
Posts: 665
Default Re: PM5324 Is the RF Attenuator Fried?

This is such a useful forum - last week, I knew my PM5324 attenuator was poor, but I didn't know it needed a normally unobtainable special part.

Now, thanks to the forum I know about the attenuator it needed rather than a simple pot, and thanks to Wendy, I have one in my hand!

Many thanks to all, and especially Wendy.

Stuart
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Old 11th Jan 2019, 2:53 pm   #22
MrVa1ve
Tetrode
 
Join Date: Mar 2017
Location: Dublin, Ireland
Posts: 75
Default Re: PM5324 Is the RF Attenuator Fried?

Indeed it is Stuart and advice from this site has helped me many times in the past.

As a final final update, with the new attenuator in place, I could afford to tear the old one apart for an autopsy. The "notch" I felt at the extreme clockwise end of the rotation turned out to be a scorched indentation in the resistive material. So, it seems like at some point the RF output was attached to a high energy source causing the wiper to burn a hole in the resistive disk. Ouch!
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