What is this tube ?
What is this tube ?
I have acquired a boxful of used tubes and I cannot identify what this tube is. It is a Sylvania 40A1, octal base. Anyone know what this one is? It is not listed in my RCA tube manual nor my tube tester chart.
G.
G.
philconerd- New Member
- Number of posts : 8
Registration date : 2009-02-03
Re: What is this tube ?
The 40A1 is a ballast/regulator tube.
Gene
Gene
geno- Member
- Number of posts : 44
Age : 73
Registration date : 2008-03-13
Re: What is this tube ?
Gene-
Thanks for the reply. None of my old radios use a ballast tube. So, I would probably sell this one if it is good. Anyone know how to test this ballast tube?
G.
Thanks for the reply. None of my old radios use a ballast tube. So, I would probably sell this one if it is good. Anyone know how to test this ballast tube?
G.
philconerd- New Member
- Number of posts : 8
Registration date : 2009-02-03
Re: What is this tube ?
For more info, that tube is used as a ballast tube in the cathode circuit of TV sweep tubes, such as the 6BQ6 tube. I don't know how to test it, as none of my testers have it listed.
Gene
Gene
geno- Member
- Number of posts : 44
Age : 73
Registration date : 2008-03-13
Re: What is this tube ?
What did the Motorola VT-71 set use? I have one of those sets and the ballast is missing...
Don Cavey- Member
- Number of posts : 101
Age : 73
Registration date : 2008-03-12
Re: What is this tube ?
Don, I don't have the Sams folder 55, but that is where the schematic is.
Gene
Gene
geno- Member
- Number of posts : 44
Age : 73
Registration date : 2008-03-13
Re: What is this tube ?
Check for continuity on pins 2 and 7, if is has continuity it is good. Emerson used these tubes in their TV's. These sell for 5-10 dollars.
Dave
Dave
easyrider8- Member
- Number of posts : 48
Registration date : 2008-03-28
Re: What is this tube ?
Thanks Dave-
Okay I checked continuity for pins 2 to 7 and I measure 135 ohms. If this is within spec, I should probably sell this one.
G.
Okay I checked continuity for pins 2 to 7 and I measure 135 ohms. If this is within spec, I should probably sell this one.
G.
philconerd- New Member
- Number of posts : 8
Registration date : 2009-02-03
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