[R-390] OT: HP-410B Tubes

[Barry]

> One trouble reported with the HP meters is that they used a wire wound 
> (200 ohm, I think) pot for some of the cal or settings pots.  These  
> develop intermittent or high resistance at the ends where the winding  
> is crimped by the solder tabs.  Treatment with De-Oxit might help.   
> you may have to re-crimp the crimps if you can get to them.  Or  
> replacement pots would be a good idea.  if you find this is the case,  
> let us know where  you found the pots.

They're 500-ohm pots and while they're not exact replacements, but these look very close:

http://www.westfloridacomponents.com/mm5/merchant.mvc?Screen=PROD&Store_Code=wfc&Product_Code=P067&Category_Code=

I ordered one so we'll see.

> 
> Roy
>

Thanks,
Barry - N4BUQ