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

[Scott Robinson]

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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