[R-390] Tube Tester I-177B

[K3DX]

I've just acquired a Dynamic Mutual Conductance tube tester I-177B, with the 
socket adapter kit MX949A/U.

Before I power up this puppy, and risk letting all the smoke out, are there any 
precautions I should take? The line cord has been replaced with a 3-prong 
version. The cord insulation looks good.

I'll open it tonight and look for leaking/cracked caps and cracked resistors. 
The circuit is fairly simple, isn't it? Does it even use DC?

I'm impressed by the meter. It has three scales in microMhos. That seems a lot 
better than good/OK/bad.

 From what I see in the charts, almost all the R390A tubes require using the 
adapter "octopus." The charts are dated 1952, as is the socket adapter kit.

Regards,
Dave - K3DX