Monster Power AVS2000SS & HTPS7000MKII

[zylcho]

Recently purchased "used" Monster Power units and both have issues. Monster tells me they don't service units, only do warranty exchanges. They don't sell parts either! So here I am back with you great folks to see if someone could lend a hand.

The AVS2000SS has a wicked 50Hz audible hum that can be heard through connected components. I guess the power cord must have been nicked or cut as it has been spliced with CRIMP connectors! I haven't unwound the mile of dollar store electrical tape over the connection to see whats what yet. I hope I get lucky. But other than hum and power cord it looks like its doing its job well keeping the line voltage right on the money.

The HTPS7000MKII has a bad digital display. Comes on sporadically, single digit here and there. Taps do nothing.

Haven't done anything to either except plug in and check voltages, apply loads with the audio system at peak pressures and it didn't skip a beat. Would like to keep these, any help would be greatly appreciated.

[budm]

Re: Monster Power AVS2000SS & HTPS7000MKII

That AVS2000 is nothing more than a motorized VARIAC to regulate the output voltage, it will hum real bad when the AC has high harmonic, the problem with TOROID which will hum like crazy the AC is not symmetrical (DC offset).

http://sound.westhost.com/articles/xfmr-dc.htm
http://www.plitron.com/news/low-noise-technology/

[zylcho]

Re: Monster Power AVS2000SS & HTPS7000MKII

Thanks for the response but these are made to reduce line noise and control voltage. I have seen several of these in other systems that were crystal clear. Now granted I have a tri-amped rack setup with about 900 a channel, but I never experienced hum with a $50 Belkin gang box. New these are $3500+, Monster is useless as they couldnt even tell me a service location.

[tom66]

Re: Monster Power AVS2000SS & HTPS7000MKII

Unfortunately you are wasting your money. These units will do nothing for a good audio amplifier. The large variac will act slightly as a filter, but not much more than the transformer inside the amplifier. Besides, a variation in the supply voltage to the amplifier is not corrected instantly, and even if it were, the amplifier will rarely require the peak voltage from the capacitor bank.

[budm]

Re: Monster Power AVS2000SS & HTPS7000MKII

I am talking about mechanical hum from the VARIAC. You can also hear the servo motor running when it tries to adjust the voltage.

[tom66]

Re: Monster Power AVS2000SS & HTPS7000MKII

Yes, and I'm saying that kind of adjustment is not going to make any difference. But audiophiles do like spending money on unusual tweaks.