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Post subject: Isolation Transformer
Posted: Sun Feb 10, 2019 3:48 pm
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Roadie
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I recently acquired this iso I plan to use solely for my autotransformer. There's not a ground/common issue with this one so it should serve it's purpose well. However, I've always found different thoughts on the order.

Iso + autotransformer + amp
or
autotransformer + iso + amp
or
It doesn't friggin' matter

Any food for thought,

UN


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Post subject: Re: Isolation Transformer
Posted: Sun Feb 10, 2019 7:38 pm
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Rock Star
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Upnorth2, you using this isolation transformer to clean the AC line --- going to your guitar amp? I think you'll need a heftier one. I run a 4KV one, in my house sound room (with guitar and hi-fi gear). 1KV ones for my computer and TVs.

http://www.surplussales.com/class/induc ... Power.html

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Post subject: Re: Isolation Transformer
Posted: Sun Feb 10, 2019 8:53 pm
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Roadie
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No, not for filtering the AC but rather to lift the mains ground (tied to neutral).

UN


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Post subject: Re: Isolation Transformer
Posted: Sun Feb 10, 2019 9:23 pm
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Professional Musician
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What amp are you planning to use this with?
150va is only 1.3 amps.
Even the little Princeton is fused at 2a.

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Post subject: Re: Isolation Transformer
Posted: Mon Feb 11, 2019 12:05 am
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Rock Star
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Okay. But, what is the advantages of lifting the ground? To help reduce ground loops with pedals or recording equipment?

Thanks!


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Post subject: Re: Isolation Transformer
Posted: Mon Feb 11, 2019 7:54 am
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Roadie
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Okay, let me clarify. This is only for bench work. I realize it has it's limits (volt - ampere rating) and I will dig in to it's proper use. E.g., some "ancient" low power amps (and radios) didn't have a power transformer so they directly rectified the AC mains.

Don't get me wrong, I appreciate the manner of question but I was initially just trying to gather info on what sequence you prefer from the wall outlet to your test subject.

UN


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Post subject: Re: Isolation Transformer
Posted: Mon Feb 11, 2019 9:30 am
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Rock Star
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Okay, for bench work... I'd put isolation transformer first (off AC outlet). Then, auto-transformer (Variac). Then unit to be fixed. That's how I have my bench laid-out.

:)


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Post subject: Re: Isolation Transformer
Posted: Mon Feb 11, 2019 10:43 am
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Professional Musician
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Location: Coastal Bend, Tx.
My amps significantly pull less amps than there rated fuses or they would be precariously close to shut down,
for instance my
TV Dlx only draws .5 amps
Bronco draws .4 amps
measured amperage by my brown box.


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Post subject: Re: Isolation Transformer
Posted: Mon Feb 11, 2019 1:15 pm
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sfceric64 wrote:
My amps significantly pull less amps than there rated fuses or they would be precariously close to shut down,
for instance my
TV Dlx only draws .5 amps
Bronco draws .4 amps
measured amperage by my brown box.


Is that measurement taken at idle or during a full-output peak?

Arjay

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Post subject: Re: Isolation Transformer
Posted: Mon Feb 11, 2019 1:59 pm
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Professional Musician
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Joined: Tue Nov 27, 2012 6:56 am
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Location: Coastal Bend, Tx.
Good point Arjay, that's the idle amperage. Never look down at the meter when playing, I'll have to check that out the next playing session. I'd imagine it will likely nearly double.

Edit: well I couldn't wait to watch it, I only punched up the Bronco and it stayed pretty steady. Started at .3 and maybe jumped to .4 throughout the volume range w/ full chords picked relatively hard. I suppose if I were reading inside the amp through a scope it would be different.


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