New (to me) projects on the bench – Part 2

Started going through the bench stuff from Craigslist:

2) B & K Precision 177 VTVM Dynascan Vacuum Tube Volt Meter Tester – Works, nothing needed.

3) Superior Electric 3PN 116B Variable Powerstat Auto Transformer 109A 0-140 VAC – Works, nothing needed.

11)Triad N-55M Isolation Transformer 115V-115V 250VA-60hz – Works, nothing needed.

13) Shurite Panel Meter – Cleaning needed

Meter tested in good condition but had something on the plastic front. I easily disassembled the meter and tried to wash the cover in warm water, no luck… then soapy warm water, no luck, then scrubbing pretty hard, no luck.

Well, time to get creative, I have been wanting to try this for a while anyway. Taping off the bottom section, to preserve the “fog” there, I proceeded to wet sand (250 grit) the cover for a few minutes until the sanding was all I saw. This left a dull sand line and then I proceeded to use 600 Grit and then 1000 and 2000 to get to a dull fine finish. I would estimate I did around 5 minutes of sanding with each grit rinsing every few minutes.

Then I polished with tooth paste. Yes, toothpaste. I used a paper towel and a dab of tooth paste and rubbed for about 5 minutes and this brought back the clearness. You can see the final result.

Reassemble and pop this one on the shelf to use later.


Here is what is left:

1) Leader LBO-507A 20MHz Oscilloscope
4) REM Electronics Cathode Recovery and CRT Tester w/ original box 
5) B & K Precision Model 465 CRT Cathode Ray Tester with original manuals
6) Shurite Amperes Meter
7) EICO Model 950A Resistance Capacitance Compactor Bridge Tester 
8) EICO Model 221 Vacuum Tube Volt Meter
9) Edwards Signaling Transformer 88-100
10) Vapor Tight Heavy Duty Marine Power Selector Switch 12v 150A/6v 300A Continuous
12) ASI Dynamic Transistor Checker 
14) Louis Marx Model Train Transformer
15) Unknown tester device with old radio bulbs

Have fun and 73’s,

Let me know what questions you want me to address or if anything is unclear. My email is


About K0FEY

I am a member of the Eden Prairie Radio club. This is a Minnesota Ham Radio Enthusiast club and we promote experimentation and learning through the Amateur Radio hobby. Come check into a net on Sunday with us or better yet meet us in person on the 3rd Thursday of the month.
This entry was posted in Experiments, Science, Testing, Uncategorized. Bookmark the permalink.

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s