[RE-wrenches] Sound Equipment Inverter

[Jay]

Hi Ray,

Given how small your load is and with what Bryan has suggested, it would be a very inexpensive way to go. 

If you need battery charging while using it and you find noise through battery charger then using a 2 battery system with harness of Anderson connectors would all you to disconnect one and charge it, and then swap without losing power to the inverter. 

Cheers
Jay

> On Oct 22, 2020, at 8:56 PM, Ray <ray at solarray.com> wrote:
> 
> Hi Jay;
> 
> Another great question, that I can't answer.  The continuous watts would probably meter at 100 watts or so, but the transient peaks can be quite a bit more. How much more, depends on how fast your meter capture is, but the ear can hear up to 20 kHz, and my meter can't catch transients anywhere close to that.
> 
> Having a power supply that can handle those musical transients is important, even if I can't measure it.  The power supply can cause some compression of the sound.  I've already run into that, with transformers on the tube amps, inverter sizing, battery sizing, and Vac.
> 
> As Dave mentioned, the AC voltage can really matter to these amps, and to bring EVH (rip) again into a seemingly unrelated industry, Eddie used a Variac to feed his Marshall amps lower voltages, to operate at lower volume to get his "Brown sound".
> 
> All that aside, I'm thinking an Exeltech XP1100 might be plenty, and is a known, high quality waveform.  But then I'd have to add a separate DC charger with its own possible noise issues.   I've used Samlex very little, but seen their inverters survive serious abuse in others' installs, so I look forward to hearing more about Bryan's studio build, too.
> 
> 
> Ray Walters
> Remote Solar
> 303 505-8760
> 
>> On 10/22/20 5:29 PM, Jay wrote:
>> Hi Ray
>> 
>> How many watt do you need?
>> 
>> Jay
>> 
>>>> On Oct 22, 2020, at 4:42 PM, Ray <ray at solarray.com> wrote:
>>> 
>>> Hi All;
>>> 
>>> I've just had an inquiry on building a portable sound stage and recording setup.  Traditionally we've always used Exeltech, as they've had the cleanest output, with background buzz on tube amps being lower than grid power.  Modsine were horrible, Old Trace SWs were pretty intolerable, Magnum's were usable, but still noticeably more buzz than grid.  I think THD is roughly associated with the background buzz, but there might be certain harmonics that are particularly problematic.  I haven't gotten into looking at the separate harmonics relative to what induces the most noise in these old vacuum tube circuits.
>>> 
>>> This is a 48 v application that also needs a built in charger with transfer switching.  Exeltech does not appear to have anything in that department.  Any other choices?  How are Samlex?
>>> 
>>> As always, thanks in advance for your time and expertise,
>>> 
>>> -- 
>>> Ray Walters
>>> Remote Solar
>>> 303 505-8760
>>> 
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