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25th Anniversary SE84UFO3 Monoblocks (Read 36286 times)
Archie
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Posts: 1929
Re: 25th Anniversary SE84UFO3 Monoblocks
Reply #100 - 05/03/20 at 22:55:52
 
If the hum is there without the source connected then it would be the CSP3. †It could also be tube related*. †Given the lack of anniversary mods in your CSP3, it may now be the "weak link." †I've had the mods done to all of my components.

Steve told me to put my ZMA volume to full and use the master volume on the CSP3. †I don't do that since I think it sort of defeats the purpose of having all of that voltage potential of the CSP3. †I push my CSP3 settings towards the high side and throttle back the ZMA pot. †I've got a lot more watts than you and I tend to listen at 50% on the ZMA. †I tend to listen loud too.

I don't see a reason that your line voltage would effect the CSP3 voltages but I assume Steve made the chart from his 120 volt version.

*A possibly related thing to this issue is that I was chasing a "whistle" I was getting in my right channel that I assumed was related to my ZMA tubes. †After swapping every tube right to left, I finally found that the problem was with the front tube in my CSP3.
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Technics 1200G TT w/ Ortofon Jubilee MC cart
ZMC1
ZP3 (25th A Mods)
ZR2 (25th A Mods)
CSP3 (25th A mods)
ZMA (25th A mods)
ZLC
Homemade Big Betsy Speakers
Silver Cabling
DIY Isolation platforms under amps & TT.
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Lon
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"Love without
guts is
worthless!"
Philip K. D*ck

Posts: 16777
Re: 25th Anniversary SE84UFO3 Monoblocks
Reply #101 - 05/04/20 at 01:25:03
 
I hope you can resolve the hum. The two times I have had hum with my CSP3 in the system the problem was not the CSP3. One time it was the fact that I had my cable tv DVR connected to the system. The hum was coming in on the coaxial cable itself. I put a filter in line and the hum went away. (Later when Time Warner was sold to Spectrum and Spectrum changed over the cable tech frowned on it and told me to take it out I did so. . . the hum had gone away). The second time it was a cable placement issue. I am not sure which power cable was next to an interconnect that caused the problem but I think that was the issue. I ended up dismantling my whole cable loom and re-routing things to more effectively isolate power and signal cables and the hum went away.

Though expensive, the 25th Anniversary mod to the CSP3 is transformative. It's good pre-mods, it's really great after.

I play around with the gain between my DAC, ZTPRE, ZROCK2 and CSP3 and input gain on my Monoblocks. I have the Monoblocks at about 3/4 volume, the ZROCK2 pretty pumped up, the CSP3 outputs about 60 percent, and the ZTPRE about 70 percent. Usually my DAC is at 100 but I sometimes knock it back 5 or 10 percent. I control master volume via the ZTPRE. I can get incredible sound playing about with these gain values.
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HR-1,ZTPRE,ZBIT,ZROCK2,SE84UFO3-25th x2, CSP3-25th.Taboo Mk IV; Rega RP3 w/25th mods PS Audio: DMP+DSD,P15,NPC,PowerBases,AC-12 pwr cbls, Statement spkr cbls;Mapleshade:Samson V3; Oppo UDP-205; VooDoo:Cremona+Amati intrcncts, Iso-Pods;headphones:PM1,HD800S,ZMF Ori
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Geno
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Without music, life
would be a mistake.
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Posts: 898
Re: 25th Anniversary SE84UFO3 Monoblocks
Reply #102 - 05/04/20 at 03:35:11
 
Iím glad I read your post closely, Lon. I had not considered turning my DSDac up that much. It usually stays down around 80. Cranking up my amp and the DAC much higher, and controlling the volume with the CSP3 has just given me my best sound yet. My pre outputs are about 70%. Much more density like this.

Archie, Iíll be glad when I get my knobs for the CSP3. Having to adjust between phono and digital is driving me crazy. I need a reference point! I did put a black sticker pointer on my gold pre volume and that has really helped.
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SE84UFO(25th Mods)
CSP3
PS Audio DSDAC JR / Cambr.Audio CXC / LRaven AudioPC / ZBIT
Technics 1210MK5(KAB Mods)-KAB/Ortof ProS 40 cart / ZP3(25th Mods)
Otari MX5050 R2R
Decware ZLC
Alnico Betsy Baffles OR Crystal 10 Baffles
(2) 12" Lii Bass Baffles
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Lon
Seasoned Member
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"Love without
guts is
worthless!"
Philip K. D*ck

Posts: 16777
Re: 25th Anniversary SE84UFO3 Monoblocks
Reply #103 - 05/04/20 at 11:47:44
 
Great Geno. Lots to be discovered with the CSP3 and its gain and the gain of other components.
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HR-1,ZTPRE,ZBIT,ZROCK2,SE84UFO3-25th x2, CSP3-25th.Taboo Mk IV; Rega RP3 w/25th mods PS Audio: DMP+DSD,P15,NPC,PowerBases,AC-12 pwr cbls, Statement spkr cbls;Mapleshade:Samson V3; Oppo UDP-205; VooDoo:Cremona+Amati intrcncts, Iso-Pods;headphones:PM1,HD800S,ZMF Ori
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