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General Boards => Museum Submarine Discussion => Topic started by: Mark Sarsfield on July 20, 2009, 04:30:35 PM

Title: Type 20C-5 Switch Box for Sound-Powered Telephones
Post by: Mark Sarsfield on July 20, 2009, 04:30:35 PM

Can someone send me some photos of a Type 20C-5 switch box for the sound-powered phone system?  According to the fleet boat manual... "The switch box is located between the periscope walls in the control room, and facing to starboard has 20 toggle switches. Twelve of the switches in the 3 left-hand vertical rows serve the circuits of the XJA system, and 5 in the 2 right-hand vertical rows serve the JA system. The other 3 switches are spares."

I think I know what box they are referring to and we have the box and guts, but the interface panel is missing.  It's a small, silver box aft of our 1MC stack.  Thanks.

Title: Re: Type 20C-5 Switch Box for Sound-Powered Telephones
Post by: Mark Sarsfield on July 21, 2009, 10:02:40 AM

I found a picture of the Drum's switchboard that Tom posted last year, but I don't think that this is the newer model (20C-5) mentioned in the fleet boat manual - same principle, though.

(http://www.submarinemuseums.org/forum/index.php?action=dlattach;topic=195.0;attach=348;image)

Our switch box is about 10-12 inches high and maybe 8 inches across.

Title: Re: Type 20C-5 Switch Box for Sound-Powered Telephones
Post by: Mark Sarsfield on July 26, 2011, 09:21:58 AM

I know that you guys are busy on the Drum with a lot of structural issues, but if you ever get a moment, please remove the switch panel and take some photos of the wiring leading to the panel and the back side of the panel, itself.  Thanks.

Also, if any of the Balao boats could take a picture of their switch panel, that would help us out a lot, too.

Title: Re: Type 20C-5 Switch Box for Sound-Powered Telephones
Post by: Darrin on July 26, 2011, 06:03:41 PM

Mark,
Sadly we discussed this issue 2 years ago and no one has stepped up to help, I will take a look on HNSA and see what they have posted since then..

Title: Re: Type 20C-5 Switch Box for Sound-Powered Telephones
Post by: Mark Sarsfield on July 27, 2011, 08:51:40 AM

We got the jack on the fwd. periscope shear reconnected and we tested it using the radio room jack.  We figured out how to Jerry-rig the telephone box in order to get the jacks to talk to each other (with hand/headsets, of course).  I'd like to make a new switch panel to replace the old one that the Navy took decades ago.  The older style panels have the small direct connect jacks below below each switch.  The "newer" ones did not have the jacks.  I'm leaning toward the latter.

So, a photo of a newer panel would help me out a lot.

Title: Re: Type 20C-5 Switch Box for Sound-Powered Telephones
Post by: emeacho on July 30, 2011, 10:20:46 PM

I have no idea what type this sound powered phone switch box is, but this is what we have on Torsk.

Title: Re: Type 20C-5 Switch Box for Sound-Powered Telephones
Post by: Mark Sarsfield on July 31, 2011, 09:06:56 PM

That's the newer style with toggle switches and it still has the direct patch cable jacks.