[Texasrocker]

sometimes, I have found a "weaker" pentagrid-converter tube can also produce different results, but then again, sometimes not enough change to really matter. Having a extra stage always helps as Ron mentioned. One of the very-best designed AM band only receiver chassis I ever ran across for both selectivity & sensitivity, was the early 50s Silvertone 6-tube AC/DC sets utilizing a factory installed tapped- ferrite rod antenna!! They were ugly bakelight cabinets, in models 2014, 2015, & and 2016 depicting different color cabinets, but lordy mercy, they are great performers for "off the shelf" cheap ac/dc sets!! Hallicrafters high $$ long distance AM reception designed sets dont even keep up with them!!!!
I didnt mean to get off-topic (brands) here, I love all my "beautiful" vintage Philcos also!!
The Silvertones models 2014, 5, & 6 bakelights sell very cheap on ebay! For receiving long-distant stations over 1000 miles away at night, you techs would be amazed at these Silvertone receivers when fully restored! No longwire antenna needed! Just rotate the radio for best reception!Sometimes, the engineers just get a perfect match on chassis-design, and they sure did on the 53 model Silvertones indeed!!! Try one, you will definately be impressed all across the dial after sunset,, Guaranteed!! The performance of these simple AC/DC sets will leave you techs in "awe" once you restore one,if you do, even for long distance daytime reception as well!!