[ARC5] [Milsurplus] Cool New DC-DC Converter

[Michael Bittner]

Hi Scott,

There is a guy at the TRW swap meet that has all sizes of 2-Volt gel-cells 
as well as 6 and 12-volt ones, every month at reasonable prices.  They are 
apparently checked out and recharged surplus from hospitals and other places 
with emergency backup supplies that are required to replace them 
periodically.  I have got good service from them on my homebrew battery 
receivers.

What is the size of the GE 260 battery compartment that one would have to 
fit into?  If interested, let me know if you want one or more of the 2-Volt 
kind and I can see if he has a size that fits, and get price and shipping 
cost.

Mike, W6MAB


----- Original Message ----- 
From: "Scott Robinson" <spr at earthlink.net>
To: "Michael Bittner" <mmab at cox.net>; "D C _Mac_ Macdonald" 
<k2gkk at hotmail.com>; "David Stinson" <arc5 at ix.netcom.com>; "Michael Hanz" 
<aaf-radio-1 at aafradio.org>
Cc: "ARC-5" <arc5 at mailman.qth.net>; <milsurplus at mailman.qth.net>
Sent: Thursday, March 15, 2018 7:58 AM
Subject: Re: [ARC5] [Milsurplus] Cool New DC-DC Converter


> Hi Mike,
>
> I have found 2V gel-cells hard to get, 6V easier. Bummer, because I use 
> one in my GE model 260 portable, which use a vibrator to make B+ and runs 
> the 1.4V filaments directly off the 2V bttery via an RF noise filter with 
> the right DC resistance.
>
> Peace,
>
> Scott
>
> On 3/15/18 7:22 AM, Michael Bittner wrote:
>> Right on, Mike. I could use it right now for my farm radios, portables 
>> and LF beacon receivers that use 1.4-Volt filament tubes and typically 
>> require A batteries of 1.5 V for parallel filaments or, 7.5 V or 9 V for 
>> series string filaments.
>> However, my dream B+ power supply for these sets would run off of a 
>> rechargeable 2-Volt gel cell.
>> Mike, W6MAB
>>
>>     ----- Original Message -----
>>     *From:* Michael Hanz <mailto:aaf-radio-1 at aafradio.org>
>>     *To:* D C _Mac_ Macdonald <mailto:k2gkk at hotmail.com> ; David Stinson
>>     <mailto:arc5 at ix.netcom.com>
>>     *Cc:* ARC-5 <mailto:arc5 at mailman.qth.net> ;
>>     milsurplus at mailman.qth.net <mailto:milsurplus at mailman.qth.net>
>>     *Sent:* Thursday, March 15, 2018 6:55 AM
>>     *Subject:* Re: [Milsurplus] [ARC5] Cool New DC-DC Converter
>>
>>     I assume as a supply for battery sets that require both A and B
>>     batteries, Mac.
>>
>>      - Mike KC4TOS
>>
>>     On 3/15/2018 9:44 AM, D C _Mac_ Macdonald wrote:
>>>
>>>     If you already have the 12VDC, why would you even be concerned
>>>     about using the low voltage output? I assume (yeah, I know) that
>>>     one might be considering changing command set receivers to 12V
>>>     filaments, but don't know why you would want to have regulated
>>>     filament voltage except maybe for the local oscillator/mixer.
>>>
>>>
>>>     73 de Mac, K2GKK/5
>>>     (Since 30 Nov '53)
>>>     Oklahoma City, OK
>>>     USAF Retired 61-81
>>>     FAA Retired 94-10
>>>
>>>
>>>     ------------------------------------------------------------------------
>>>     *From:* arc5-bounces at mailman.qth.net
>>>     <arc5-bounces at mailman.qth.net> on behalf of Peter Gottlieb
>>>     <kb2vtl at gmail.com>
>>>     *Sent:* Thursday, March 15, 2018 08:34
>>>     *To:* David Stinson
>>>     *Cc:* ARC-5; milsurplus at mailman.qth.net
>>>     *Subject:* Re: [ARC5] Cool New DC-DC Converter
>>>     Sounds useful. Question: how much more current does a tube
>>>     filament take when cold?
>>>
>>>
>>>     Peter
>>>
>>>     > On Mar 15, 2018, at 8:37 AM, David Stinson <arc5 at ix.netcom.com> 
>>> wrote:
>>>     > > This DC-DC converter looks really interesting.  It
>>>     > inputs 12V and can source a regulated from 1.25V
>>>     > to 12V at 3A for filaments and regulated 150V to
>>>     > 420V at up to 60mA for B+. Gonna get me one of
>>>     > these.
>>>     > 
>>> https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ebay.com%2Fitm%2F173034019336&data=02%7C01%7C%7C9450b4624bca42f4892d08d58a7988e3%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636567176942236244&sdata=UIr0oP1%2BuK5czkkVQd1eSPEvvaLocFUPJqZdItiEl%2Fc%3D&reserved=0
>>>     > > 73 Dave AB5S
>>>
>>
>>     ------------------------------------------------------------------------
>>
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