Posts: 88
Threads: 17
Joined: May 2018
City: Hayden, ID
I have 7 XXL tubes, and all but 1 check bad, the one had no filament, so I know it’s bad. But all the others check bad on my Jackson 648s. Some of my other tubes check goo, but not the XXL tubes, but they all check at 30 and 40. Is this normal?
Philco 41-295X 4 band radio.
I'm 67 years old, in north Idaho.
Posts: 7,248
Threads: 266
Joined: Dec 2009
City: Roslyn Pa
On my 41-300 both of the xxl's were weak/unusable. Poor performance @ the low end of the bcb.
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
Posts: 23
Threads: 2
Joined: Dec 2018
City: Coopersville
State, Province, Country: MI
Hi Nortonz!
A Jackson 648 is an emission style tester, so if those tubes don't pass the emission test on the 648, they are probably bad. However, the best way to know for SURE is to put them in a working radio and compare the performance of the radio. Both R.L. Drake and Collins radio suggested that method to be SURE that the tube was indeed bad. I wouldn't pitch the XXL's until I had a working set to plug them in to, so as to make a definite determination. BTW, if memory serves, an XXL is the same as a 7A4. But that is the only other sub for an XXL.
Kim Herron W8ZV
w8zv at goldenradioservice.com
1-616-677-3706
Posts: 88
Threads: 17
Joined: May 2018
City: Hayden, ID
That’s my plan, I have three 37’s on order, when they com in for my 41-295, I will try them to know for sure. BTW your memory serves you well the 7A4 is the only sub for a XXL.
Philco 41-295X 4 band radio.
I'm 67 years old, in north Idaho.