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25th Anniversary SE84UFO3 Monoblocks (Read 49389 times)
Archie
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Posts: 2360
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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ZLC
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)
Homemade Big Betsy Speakers (F15s)
Silver Cabling
DIY Isolation platforms under amps & TT.
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Lon
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"Love without
guts is
worthless!"
Philip K. Dick

Posts: 18507
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 all GrooveTracer mods PS Audio: DMP+DSD,P15,NPC,PowerBases,AC-12 pwr cbls, Reference spkr cbls;Mapleshade:Samson V3;;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: 1387
Re: 25th Anniversary SE84UFO3 Monoblocks
Reply #102 - 05/04/20 at 03:35:11
 
Im 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, Ill 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) OR Sansui AU-222 Intgr. Amp OR Sansui 800 Recvr
Cambr. Audio CXN (ModWright) Cambr. Audio CXC ZBIT
Technics 1210 MK5 (KAB Mods) - KAB/Ortof Concorde 40 cart
Otari MX5050 R2R
ZLC Pwr Cond.
Lii Cryst 10 Open Baff Lii W15 Bass Baff
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Lon
Seasoned Member
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"Love without
guts is
worthless!"
Philip K. Dick

Posts: 18507
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 all GrooveTracer mods PS Audio: DMP+DSD,P15,NPC,PowerBases,AC-12 pwr cbls, Reference spkr cbls;Mapleshade:Samson V3;;VooDoo:Cremona+Amati intrcncts, Iso-Pods;headphones:PM1,HD800S,ZMF Ori
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jorgen
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Posts: 224
Re: 25th Anniversary SE84UFO3 Monoblocks
Reply #104 - 03/05/21 at 16:06:42
 
hey Lon

recieved a pair of tube 80 rectifiers today, and of course, since im a moron, i didnt get the adapters. could you supply a link for these? forever noob, i cant bother to buy the wrong ones, so this my way of making sure  to get correct ones

the ones i bought is rca, values: 1556/1450 (800) or so its written on the tube with pen, so just think thats what was found when tested. is this an ok version? no to expensive

also; you use "alternative" input tubes on the monos? 7308? i tried to find some , and found them pretty expensive, any recommondations?
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Lon
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"Love without
guts is
worthless!"
Philip K. Dick

Posts: 18507
Re: 25th Anniversary SE84UFO3 Monoblocks
Reply #105 - 03/05/21 at 17:43:22
 
There are lots of alternatives on eBay, here's one:

https://www.ebay.com/itm/Amptata-5Z3-274A-80-To-5U4G-GZ34-274B-5Y3-5AR4-Tube-Ada...

Another:
https://www.ebay.com/itm/1pc-Gold-WE274A-5Z3-80-TO-WE274B-5U4G-GZ34-5AR4-Tube-co...

Almost all I have seen are from China or Hong Kong, and you have a 14 to 20 day wait or so. I used to have an American source but I think they have dried up.

As for the input tubes . . . I hestitate to make specific recommendations because I have found that even the ROOM makes a difference--tubes I didn't prefer in my living room I prefer upstairs with the same system, and vice versa. You can use so many different types! I really like the Russian NOS tubes from Steve--if you are going to use 6N1P or 6N6P get them from Steve--it's a crapshoot otherwise out on the internet. Steve tests and matches his meticulously. You can use 6922, 7DJ8, so many more. This page I find to be a useful guide:

http://www.audiotubes.com/6dj8.htm

I've gone beyond the pale perhaps. I use 6N5P, 6N6P, 6SN7 with converters, 6085 with converters, tend to rotate these as the fancy strikes me. Lately the 6SN7 and 6085 have stuck.
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HR-1,ZTPRE,ZBIT,ZROCK2,SE84UFO3-25th x2, CSP3-25th.Taboo Mk IV; Rega RP3 w all GrooveTracer mods PS Audio: DMP+DSD,P15,NPC,PowerBases,AC-12 pwr cbls, Reference spkr cbls;Mapleshade:Samson V3;;VooDoo:Cremona+Amati intrcncts, Iso-Pods;headphones:PM1,HD800S,ZMF Ori
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jorgen
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Posts: 224
Re: 25th Anniversary SE84UFO3 Monoblocks
Reply #106 - 03/06/21 at 14:12:08
 
Thank you for your input Lon
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