[R-390] Tube Tester I-177B

[Barry Williams]

I have one too. Had to look for about 3 years to find the mini tube 
adapter module.

The charts done by Nolan are first class.



Barry

> http://www.acadiacom.net/nlee/
>
> Here ya' go Bubba!!
>
> Joe
>
>
>
>
> --- K3DX <K3DXlab at comcast.net> wrote:
>
>   
>> 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
>>
>>