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Tubes for 25th (Read 12813 times)
Ace-Tone
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Re: Tubes for 25th
Reply #50 - 07/22/19 at 22:14:39
 
Regarding the Pair of OA3 tubes by the transformer...anyone try other VR's in those slots?
I tried a pair of Raytheon OD3W...sound very good, and the meters register approx 5 points lower.  Now reading 23-24.
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SE84UFO25, ZP3, Zstage, ZR2, ZSB, DM947 Monoliths 946+mid
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jslateiv
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Re: Tubes for 25th
Reply #51 - 07/23/19 at 01:24:59
 
I've tried the OD3W's, OC3's and a few variety of OA3's.  I ended up happy with the OA3's.  Been a while since I rolled though so probably need to revisit  now that everything has an additional ~600 hrs since the last switch up.   Lovin an E288CC on high bias with an OC3 though with the OA3's in the back!   Rect. is the SE Aqua 284.
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Vooraphile
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Re: Tubes for 25th
Reply #52 - 12/12/19 at 12:42:25
 
Anyone roll the SE84UFO25 power tube with EL84..? Is this safe or possible.?
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Palomino
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Re: Tubes for 25th
Reply #53 - 12/12/19 at 12:53:00
 
The forum member who tried this and had issues was Badwolf.  You might PM him.
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Vooraphile
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Re: Tubes for 25th
Reply #54 - 12/13/19 at 15:15:20
 
Alright.. Thank you.
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Oppo UDP205-jb or Planar 3
Teac NT505 to ZBit
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DSG. DSRII. DHC-1. ZSTYX.
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Lon
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Re: Tubes for 25th
Reply #55 - 12/13/19 at 15:55:31
 
The product page does list the EL84 as one of the two output tube types.

https://www.decware.com/newsite/SE84UFO25.html

and the manual:

https://www.decware.com/newsite/SE84UFO25manual.pdf

The manual does note that the Hazen Grid Mod is not activated with the EL84, but that is not completely prohibitive. . . .

I've used the EL84 with Zen amps before (Rev. A, C, Select) and with my Taboo Mk III and Mk IV, and with my current 25th Anniversary SE84UFO3 Monoblocks but though I've really enjoyed them in the earlier amps the stock tubes from Steve clearly sound best to me in the Monoblocks.
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JOMAN
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Re: Tubes for 25th
Reply #56 - 12/13/19 at 21:57:15
 
Same experience as Lonsí on the power tubes.  I have some TAD EL84STR that I used in my UFO2 for a time and tried them in my UFO25.  The stock power tubes are in for keeps.
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Palomino
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Re: Tubes for 25th
Reply #57 - 12/13/19 at 22:17:53
 
Iíll ask Badwolf what tubes he was using and what Steve said.  Heís pretty experienced so I canít imagine him trying something that wasnít listed in the manual.
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i7 Mac Mini with LPSU/SSD running Audirvana 3.5, Uptone Audio Regen on LPSU, Mytek Brooklyn DAC+, Ven Haus DIY Silver ICs, 25th Anniversary Zen, PS Audio P5 Power Supply, PS Audio Power Cords, Zen Styx Speaker Wire, DIY Big Betsy and Crystal 10 Open Baffle Speaker
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Ace-Tone
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Re: Tubes for 25th
Reply #58 - 07/09/20 at 19:36:35
 
Just a FYI:
Had a channel balance issue last night. turned up the right channel to fix it to no avail. Then I realized the right side OA3 was not lit. Right channel milliamperers reading was 40. Left was 32. Plugged in a NOS RCA and all is well now...no warning at all on the bad tube..one day fine next day DOA.
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SE84UFO25, ZP3, Zstage, ZR2, ZSB, DM947 Monoliths 946+mid
VPI-Traveler v2 w/Zephyr MKIIIes.
Cambridge CXC. Schiit Bimby
Audio Envy, RAC-PC's/IC's, Mapleshade Dbl Helix+Spkr wire & jumpers
Blue Circle PLC FX2X0e, Herbies, GIK, PI Audio. Lonely Raven PC
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Rivieraranch
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Re: Tubes for 25th
Reply #59 - 07/10/20 at 23:46:04
 
Yes voltage regulator tubes die, too. You wonder whether the gas was seeping out or something else. There isn't any cathode to burn out. They could in theory last forever. But some go "poof."
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Palomino
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Re: Tubes for 25th
Reply #60 - 08/20/20 at 23:04:31
 
BTW, BadWolf recommended that I try a new VR tube. †I did and was very impressed with the results. †More open sound for sure. †I really didn't think a VR tube would have that much impact.

RCA versus what I was using - Sylvania. †Has the slots in the top getter.

Cheap sound improvement.

https://www.ebay.com/itm/NEW-IN-BOX-RCA-0A3-75-VOLT-VOLTAGE-REGULATOR-TUBE-VALVE...
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i7 Mac Mini with LPSU/SSD running Audirvana 3.5, Uptone Audio Regen on LPSU, Mytek Brooklyn DAC+, Ven Haus DIY Silver ICs, 25th Anniversary Zen, PS Audio P5 Power Supply, PS Audio Power Cords, Zen Styx Speaker Wire, DIY Big Betsy and Crystal 10 Open Baffle Speaker
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