Please help me identify this broken part

Support Part Identification
1

The only marking on this part is “7dB”. It screws into the heatsink of a RM Italy KL503HD linear amplifier. The first picture shows how it is broken, and the second picture shows the “7dB” marking. The post is broken off so short I cannot resolder it back together; thus I need to buy a new one.

IMG_7611
IMG_76111920×1440 338 KB

IMG_7609
IMG_76091920×1440 660 KB

2

This is a high frequency attenuator to attenuate the signal by 7 dB.
attenuators

3

Do you by chance know what P/N this is so I can buy the correct one and fix this linear?

4

To answer your question, we first need to know the attenuator’s physical dimensions, its operating frequency, and its dissipation power. I couldn’t find your model on the DigiKey website; perhaps there’s a similar model available, and someone can help you.

kchercmech, You have a chance of repairing the broken leg, but it requires experience and tools.

5

Adam7 - I sincerly thank you for all of your input thus far. The attenuator is 6.05mm x 12.94mm (x,y) including the hold down bolthole tab and 3.32mm (z). Without the bolthole tab, in other words just the white portion that does all of the work the x,y is 6.05mm square with the same z height of 3.32mm. I have all of the tools to desolder and resolder electronic connections and I have years of experience doing so; thus, the repair will be easy once I discover the P/N for the replacement part. Again, I truly do thank you for your help. I owe you a beer.

6

Hello kchercmech

Welcome to the TechForum community.

I will need the operating frequency and dissipation power to assist you with looking to see if we offer a part number in our system.

7

ScreenShot_2026-08-27_114733_782
ScreenShot_2026-08-27_114733_782872×1164 100 KB
That specific part seems pretty hard to find, but you could probably just bridge the broken lead directly to the PCB trace with a short piece of copper wire or solder wick.

8

Hi @kchercmech ,

This is a semi-flanged RF attenuator, 7dB, 50ohm, approx. 30W, may go up to gigahertz, but in this application is not so critical. Cannot tell the manufacturer, but can find similar e.g. from here:

A few notes:

  • If you cannot find 7dB attenuator, some nearby value will do, as this is used for the selector of input attenuation. You’ll just get a bit different attenuation steps compared to original.
  • Due to wide opening on the PCB, a full-flanged (i.e. flange with two holes) may do as well.
  • If you use the amp for TX only, you could consider using an external coaxial attenuator.
  • The device may contain Beryllium Oxide which can be harmful. See guidelines here.

Cheers, heke

9

I have no clue how to determine that. I assume I would either need a spec sheet, which RM Italy does not publish to my knowledge, or an ossiliscope, which I do not have access to.