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Old 9th February 2013, 11:47 PM   #2151
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I believe you are asking have I tried using a shorting plug at the inputs to rule out noise entering there. I have not. Easy enough to try but I have used the same turntable and cardas phono cable with a few different preamps with no problem. I have searched this forum for other such reports and there are a few mentions it doesn't seem to be commonplace. The noise seems to be something that could be a related noise existing or riding on the house wiring. I knew I should has used another transformer other than a toroid, they work well as transformers but are poor filters. One other thing that I will be addressing the next few days is changing the output coupling cap. The one I am using I come to finnd out does not work well in low voltage circuits, the tech at partsconnexion says the Obbligato gold caps need to have some current through them to work well, consequently the sound is waaaay to bass heavy.

I will try to short the inputs, if anyone knows this is not to be done please let me know.
Walt
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Old 10th February 2013, 12:33 AM   #2152
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I hooked a regular set of RCA jacks and shorted them and all noise goes away. Need help to troubleshoot causes. I am going to look for whatever obvious but I am unsure of where to go beyond looking for high resistance or lack of continuity. Will double check solder joints.
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Old 10th February 2013, 12:43 AM   #2153
kor952 is offline kor952  Netherlands
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Quote:
Originally Posted by waltroman View Post
I hooked a regular set of RCA jacks and shorted them and all noise goes away. Need help to troubleshoot causes. I am going to look for whatever obvious but I am unsure of where to go beyond looking for high resistance or lack of continuity. Will double check solder joints.
Did you check your phonocable, is it still in position at your arm base (if it uses a 5p-din at your arm base it could slip out a bit and cause hum). Do you have a earth wire connected between VSPS and your recordplayer? If so remove it if not try one.

Ronald.
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Old 10th February 2013, 01:13 AM   #2154
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I check the phono cable and it is secure. I did some initial checks for continuity and at the phono cable I check good from the base of the tonearm to the ground plug. In checking the VSPS 300 shows good from + on all phono plugs back to the solder connection at the boards, I checked the gound points and the common wire coming from the power supply and get continuity at all - connections on input and output and all ground points on the rca's. The ground for the turntable is good and shows good to the chassis. All - points show good back to the common also. I assume I am looking for something common to both channels because both have the noise. I am bringing the unit downstairs to mount the stock caps in place of the Obbligatos.
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Old 10th February 2013, 02:42 AM   #2155
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Installed the Rapport cap that came with the kit. I tried and took a wire from the TT ground lug and connected it to the grounded PS chassis and the noise is all but gone. This is easy enough to remedy, I could connect the shields and run a wire from inside the VSPS to the inside of the ground lug. Is this kosher? Is it an indicator of something else I should address?
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Old 12th February 2013, 12:32 AM   #2156
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I have numerous film caps that are 4.7uF. How will a 4.7 sound different than 2.2?
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Old 15th February 2013, 03:35 PM   #2157
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With the help of Richard I was able to troubleshoot my noise problem and it all related to the wiring of a switch I purchased from Radio shack without instructions included on how to wire it in. Apparently I was not the only one with a problem because numerous others complained of it. I followed one persons suggested wiring but if I read the reviews further down I would have realized the wiring in that fashion was flawed.
Anyway I want to make some observations on the sound of the VSPS 300 after a a few hours of brake in. I was taken back with the sound I was hearing. Initially using the Obligatto Gold output caps the sound was way too bass heavy and almost muffled. I switched to the stock caps and after a few days the sound opened up and the best way I could describe the character was dense and powerful, very dynamic. The exact opposite of many highly regarded but polite stages. Far better than my Ray Samuels Nighthawk. I ordered Hovland Supercaps based on what was hearing and will report back when they have some time on them, pricewise they are around the cost of Mundorf Supremes. They were designed to be used as coupling caps and work well in low voltage circuits and are very clear with well defined deep bass.
Walt
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Old 16th February 2013, 10:43 AM   #2158
vulejov is offline vulejov  Serbia
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All this years using wrong RIAA..
All this year using wrong "zero input impedance"..
Try this..
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Old 18th February 2013, 01:50 AM   #2159
rjm is online now rjm  Japan
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Perfectly sensible variant. Not strictly "zero input impedance" though.
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Old 18th February 2013, 07:22 AM   #2160
vulejov is offline vulejov  Serbia
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Quote:
Originally Posted by rjm View Post
Perfectly sensible variant...
.. and better sound, same quality as phono with BC550/560C.. and gain and frequency responce not depend of cartridge impedance..
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