What's a "tube socket terminal"? - Printable Version

+- The PHILCO Phorum (https://philcoradio.com/phorum)
+-- Forum: Philco Radio Discussions (https://philcoradio.com/phorum/forumdisplay.php?fid=5)
+--- Forum: Philco Electronic Restoration (https://philcoradio.com/phorum/forumdisplay.php?fid=8)
+--- Thread: What's a "tube socket terminal"? (/showthread.php?tid=2698)

---

What's a "tube socket terminal"? - DonS - 11-28-2010

I asked this question over on ARF and have not received a satisfactory answer yet.

I was looking at the alignment instructions for a Philco 40-150. I would like to use an audio level output meter (a military TS-585) as an alignment indicator. The instructions states "if an audio output meter is used, connect it to the plate and socket terminals of the 41 output tube and adjust the output meter for the 0-30VAC scale" What exactly is the "socket terminal" of the 41 tube? I know I can use a VTVM and use the AVC voltage as the alignment indicator, but I would like to use the audio output meter. Any ideas?

http://www.nostalgiaair.org/PagesByModel/331/M0013331.pdf

---

Re: What's a "tube socket terminal"? - Ron Ramirez - 11-28-2010

I have spent some time this morning looking at a large number of Philco models in the 1940 RMS Yearbook, and I am convinced the reference to a "socket" terminal is a misprint.

In the majority of 1940 Philco models, the reference is made to connect an output meter to the plate and screen terminals of an output tube. Only in the instructions for the 40-180/185/190 and the 40-195/200/201 does it call for a "socket" terminal.

A socket terminal would not make any sense, because that could be any of the six terminals of the 41 socket. And you can't connect your output meter to just any terminal of the 41 socket and expect the output meter to work; it should be the plate and screen terminals.

You can also connect the output meter between the plates of the two output tubes. The instructions for the 40-205/216 call for it to be connected this way.

So connect your meter between the plate and screen of a 41 tube, and don't lose any more sleep over this.

---

Re: What's a "tube socket terminal"? - DonS - 11-28-2010

Thanks, Ron! Someone over at ARF said the exact same thing about it possibly being a misprint, and they too suggested that the connection of the output meter be made between the plate and screen terminals of the output tube. What made me doubt the misprint theory was that the exact same instructions appear in two different pages where they refer to "socket terminal of the output tube". If you look at the link to the pdf on Nostalgiaair, you will see that the alignment instructions appear on more than one page (you need to scroll down a bit).

Don

---