[ARC5] adventures in battery ops

[Ian Wilson]

I think it's the 12A6 for which there is no direct 6-volt replacement.
I've seen the 6K6 used in 6v mods. This is not quite correct in terms of
heater current (0.4A) but it's reasonably close.

73, ian K3IMW



On Tue, Apr 7, 2015 at 7:38 AM, Bill Cromwell <wrcromwell at gmail.com> wrote:

> Hi J,
>
> The first thing is I actually said I use them portable which is different
> from 'mobile'. If I was going to use them mobile I would have to consider
> rewiring the heater strings for 12 volt operation. Or, as some owners have
> done, replace the tubes with some that run 6 volts on the heaters which
> will be happy with 12 volts applied to the original series-parallel heater
> wiring. There is not a direct 6 volt replacement for at least the 12K8 - I
> think that's the one - but it's still a viable option that has been used
> successfully.
>
> For battery operation on picnic and camp tables the 24 volt string draws
> half the current with twice the battery and no mods (reversible or not)
> required. It lasts twice as long (and not times four). My charger deals
> with the entire series battery pack in situ. I am not restricted to a '12
> volt charger'. Two fewer reasons to change the wiring.
>
> Yes..the sheet metal needs to be grounded. Any time I hear extra racket
> the first thing I look for is that ground connection being loose/missing.
> That ground connection does nothing at all to keep conducted crud from the
> power line out of the cans. Brute force filtering in the power supply helps
> with that. Or batteries.
>
> Of course, taking a cute plastic box of ICs and transistors to the picnic
> table would be ever so much easier but it's not nearly as *kool*.
>
>
> 73,
>
> Bill KU8H
>
>
> On 04/07/2015 09:17 AM, J Mcvey wrote:
>
>> I have a question about the original premise of this thread.
>> You mentioned  that you are using the radios in mobile mode, so why not
>> operate them on the car battery?
>>
>> There is a very non-destructive method for putting all the filaments in
>> parallel which is just a matter of moving a few connections.
>> At present, I am using a 12 volt dynamotor, but I am going to  build a
>> replacement 12v SMPS supply to fit onto the dynamotor plug.
>> I found that the noise in these radios is dramatically reduced if the
>> receiver rack is grounded to the frame of the vehicle with a short strap.
>> The noise is probably dynamotor hash, so I am curious how much less noise
>> and current demand will come from a properly bypassed SMPS.
>>
>>
>>
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