[Milsurplus] [ARC5] Navy Transformer CRV 30810

Mon Jan 10 12:44:25 EST 2022

Actually it looks like a filament trans. Only two secs, and they’re both 10V. The 1780V RMS to ground is prob a high pot rating, not a winding.

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From: Doran Platt<mailto:jeepp at comcast.net>
Sent: Monday, January 10, 2022 7:04 AM
To: Michael Hanz<mailto:aaf-radio-1 at aafradio.org>; Robert Downs<mailto:wa5cab at cs.com>; Roy Morgan<mailto:k1lky68 at gmail.com>; hwhall at compuserve.com<mailto:hwhall at compuserve.com>
Cc: ARC-5 List<mailto:arc5 at mailman.qth.net>; milsurplus at mailman.qth.net<mailto:milsurplus at mailman.qth.net>
Subject: Re: [ARC5] [Milsurplus] Navy Transformer CRV 30810

Looks like it would supply HV to a CRT indicator and fil.
KK3HVG
On 01/10/2022 6:36 AM Michael Hanz <aaf-radio-1 at aafradio.org> wrote:

It's actually on PDF page 97 of 154.  As you can see, it is for the Navy Model NMC-1 Echo Sounding Equipment, Contract NXss. 23136, Submarine Signal Co., Boston, Mass. Feb. 5, 1943.

[cid:part1.uHnKm8pn.ACgTO0M0 at aafradio.org]
On 1/10/2022 1:23 AM, Robert Downs via Milsurplus wrote:

Roy,

I would call that an HV x-former, (with filament winding.)  Not a filament transformer.

Where did you find the -30- listing?

Robert Downs

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From: arc5-bounces at mailman.qth.net<mailto:arc5-bounces at mailman.qth.net> [mailto:arc5-bounces at mailman.qth.net] On Behalf Of Roy Morgan

Sent: Sunday, January 9, 2022 22:57

To: hwhall at compuserve.com<mailto:hwhall at compuserve.com>

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Subject: Re: [ARC5] Navy Transformer CRV 30810

Amazing.

For many decades I have had here a filament transformer

CRP· 301721

And though it does have markings telling the voltages, I was amazed to find it listed in the 30-class transformers listing

On Jan 1, 2022, at 5:30 PM, hwhall at compuserve.com<mailto:hwhall at compuserve.com> wrote:

https://www.navy-radio.com/manuals/nt/NT-900109-3.30.xfmrs.pdf<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.navy-radio.com%2Fmanuals%2Fnt%2FNT-900109-3.30.xfmrs.pdf&data=04%7C01%7C%7Cd5f9dd1f20a04ce663fb08d9d44a6cc7%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637774238816618185%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=GneW0jveoAZ9ZsewaLdTm6sIdfO8zPQuvHOLss68qro%3D&reserved=0>

Page 42

SECONDARY 3200 VCT 0.163 AMP WHEN USING HIGH P R I M A R Y

2740 V  0.153 AMP DC WHEN USING LOW PRIMARY

4750 TURNS CT, 0.0159 E WIRE, 233 OHMS DC.

Roy Morgan

K1LKY since 1958

k1lky68 at gmail.com<mailto:k1lky68 at gmail.com>

Western Mass

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