[Milsurplus] BC-348 modifications

[Jim Whartenby]

That remote cutoff tube would be the 6AB7 / 1853.Jim
Logic: Method used to arrive at the wrong conclusion, with confidence.  Murphy 

    On Tuesday, June 20, 2023 at 01:10:47 PM CDT, Ken <kgordon2006 at frontier.com> wrote:  
 
 There  WAS a version of the 6AC7 that was variable mu. Something like 1851, but there were very few made, and I haven't seen one for sale for a very long time.
Although I am not certain about this, I believe that the most critical parameter in receiving tubes that determines their "quietness" and gain is transconductance.
Also, generally, the more grids, the more noise.
Ken W7EKB


Sent via the Samsung Galaxy S21 5G, an AT&T 5G smartphone

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