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Power conditioner question

 
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WildIowa



Joined: 06 Mar 2004
Posts: 489
Location: Henderson IA

PostPosted: Tue Sep 22, 2015 3:23 pm    Post subject: Power conditioner question Reply with quote

Do the modern power "conditioners" like Fuhrman etc. do anything to regulate or reduce the line voltage or do you need a Variac for that? I have my old tube amp back after blowing it up, again, and want to limit the line voltage to 117-120 VAC. It is now like 125-126, too hot for these old amps.
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RandyM



Joined: 10 May 2008
Posts: 6716
Location: Austin Texas

PostPosted: Tue Sep 22, 2015 4:58 pm    Post subject: Reply with quote

For vintage tube gear I ALWAYS use a variac.
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BrightKJ



Joined: 13 Sep 2008
Posts: 342
Location: Midlothian, VA

PostPosted: Wed Sep 23, 2015 7:18 am    Post subject: Reply with quote

I was going to also suggest a line-interactive UPS as an alternative, but they are much more expensive that a variac.
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Mr. Clevername



Joined: 08 Dec 2006
Posts: 2448
Location: San Francisco, CA

PostPosted: Wed Sep 23, 2015 10:48 am    Post subject: Reply with quote

I gather some of them guarantee a steady 120V.

Somebody recommended this . . .

http://www.altex.com/%2FTripp-Lite-1200-Watt-Line-Conditioner-AVR-System-LC-1200-P139529.aspx

I swear I saw a gadget recently specifically for guitar amps, with somewhat variable output, but can't find it anywhere.
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BrightKJ



Joined: 13 Sep 2008
Posts: 342
Location: Midlothian, VA

PostPosted: Wed Sep 23, 2015 11:47 am    Post subject: Reply with quote

Mr. Clevername wrote:
I gather some of them guarantee a steady 120V.

Somebody recommended this . . .

http://www.altex.com/%2FTripp-Lite-1200-Watt-Line-Conditioner-AVR-System-LC-1200-P139529.aspx

I swear I saw a gadget recently specifically for guitar amps, with somewhat variable output, but can't find it anywhere.

Yes, the above is essentially the voltage regulation part of, but not all of the line-interactive circuitry of a UPS without the battery backup. Working in IT, this is something that I consider absolutely invaluable, especially in situations where a client has an emergency generator, because they do not deliver a smooth sine wave for AC power. A full line-interactive UPS not only guarantees exactly 120V, but also an exact 60Hz sine wave. I'm almost positive the above item you referenced does not correct for the frequency of the incoming power -- just the voltage.
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RandyM



Joined: 10 May 2008
Posts: 6716
Location: Austin Texas

PostPosted: Wed Sep 23, 2015 4:07 pm    Post subject: Reply with quote

I use a variac so I can bring power up slowly. With vintage tube audio gear it can prevent meltdowns.
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