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Old 12th December 2012, 09:29 AM   #21
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Thanxs everybody that contributed to clear up my mind. Maybe is better I enjoy it as is now. I will have a look carefully to avoid the snake oil syndrome :-))
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Old 12th December 2012, 09:47 AM   #22
sreten is online now sreten  United Kingdom
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Hi,

A higher VA rated supply, say 15VA, (same AC voltage) might improve matters.

I have a large mains filter (pulled out of an old large electric typewriter)
wired into the mains lead supplying my system. It took care of the pops
created by my fridge turning off and on on the same mains ring.

I suspect the best mains filter is simply an isolating transformer fitted
with a standard filter on its primary, used for all the low power equipment.
A cheap "mains conditioner" in other words.

rgds, sreten.
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Old 12th December 2012, 09:53 AM   #23
AndrewT is offline AndrewT  Scotland
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if there is a voltage regulator (inside the box) before the audio circuit then the transformer "quality" will have a much smaller effect.
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Old 12th December 2012, 10:00 AM   #24
sreten is online now sreten  United Kingdom
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Quote:
Originally Posted by AndrewT View Post
if there is a voltage regulator (inside the box) before the audio
circuit then the transformer "quality" will have a much smaller effect.
Hi,

I'd say that is a given, and looking at the phono amps internal
power supply the place to try to make some real improvements.

rgds, sreten.
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Old 12th December 2012, 07:36 PM   #25
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Quote:
Originally Posted by sreten View Post
Hi,

A higher VA rated supply, say 15VA, (same AC voltage) might improve matters.

I have a large mains filter (pulled out of an old large electric typewriter)
wired into the mains lead supplying my system. It took care of the pops
created by my fridge turning off and on on the same mains ring.

I suspect the best mains filter is simply an isolating transformer fitted
with a standard filter on its primary, used for all the low power equipment.
A cheap "mains conditioner" in other words.

rgds, sreten.
Here a thought if the refrigerator is on the same ring add a filter to the refrigerator . SAY on of the order of 240volt 15 to 30 amp deals and see if it stops the refrig noise from being injected in that curcuit.
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Old 12th December 2012, 10:35 PM   #26
FoMoCo is offline FoMoCo  United States
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Quote:
Originally Posted by Triodethom View Post
Here a thought if the refrigerator is on the same ring add a filter to the refrigerator . SAY on of the order of 240volt 15 to 30 amp deals and see if it stops the refrig noise from being injected in that curcuit.
The only thing about that is that the refrigerator filter will be larger, costly, than one for a small pre-amp.
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Old 13th December 2012, 08:07 PM   #27
sreten is online now sreten  United Kingdom
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Location: Brighton UK
Hi,

It probably did not matter much where I actually placed the filter, given
the very short distances involved, pretty much either side of a wall, but
I assumed nearer the hifi than the fridge would be better, and as stated
as a spur off the ring better in the spur to the hifi than the fridge.

As my amplifier is integrated I didn't have the choice of only filtering the
low power stuff in my hifi, but as I said, it is a big filter, 5cmx5cmx7cm.

rgds, sreten.
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Last edited by sreten; 13th December 2012 at 08:17 PM.
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Old 13th December 2012, 08:35 PM   #28
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Join Date: Oct 2006
I've gone down the route of trying a big toroid in place of a quality AC wallwart and found no difference at all in one case and a big difference when powering more demanding valve designs. Most phono amps are very low power things.

However improving the PSU DC side has never failed to have some effect, how easy that will be to do is dependant on the amp and your skill and budget. Some highly rated and pricey phono stages use batteries, there are designs for making PSUs from rechargable batteries, including the facility to recharge, around here and on the net as people use them in diy headphone amps. Plenty of volatge regulator and some constant current supply designs also, and guys selling commercial upgrade parts.
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Old 14th December 2012, 08:03 PM   #29
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Quote:
Originally Posted by FoMoCo View Post
The only thing about that is that the refrigerator filter will be larger, costly, than one for a small pre-amp.
I bought them off ebay for 9 dollars each 30 amp corcoms . Sorry if that expensive.
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