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OA3 Tube Flash at Shutdown (Read 5643 times)
Paul64
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Posts: 11
OA3 Tube Flash at Shutdown
01/11/15 at 17:35:33
 
Hi All!  I have a 3 month old ZP3 and am loving it.  Sounds great! Was wondering if anyone else has my issue.  After I turn the power off the OA3 tube will flash about 15 times.  I tried a new tube...and it does the same thing.  Both are NOS.  My only experience with tube amps is the Tori MIV and I've never seen such a thing. Is this bad... normal... something I should talk to Steve about???  

Thanks for your input!
-Paul
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mark58
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Posts: 5645
Re: OA3 Tube Flash at Shutdown
Reply #1 - 01/11/15 at 17:46:29
 
Paul,  I also have a ZP3 and use a Nos 1950's RCA OA3.  When I shut it down, the OA3 does stay on for a little while before going dark.  I've never given it any thought...I think it's normal.  Mark.
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"The man that hath no music in himself, nor is not moved with the concord of sweet sounds, is fit for treasons, deceptions, and spoils;
The motions of his spirit are dull as night and his affections dark as Hell. Let no such man be trusted." William Shakespeare
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Lon
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Posts: 16545
Re: OA3 Tube Flash at Shutdown
Reply #2 - 01/11/15 at 18:19:39
 
Happens in my ZP3 as well, I think it's normal, doesn't seem to affect the tube or anything else.
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HR-1,ZTPRE,ZBIT,ZROCK2,SE84UFO3-25th, CSP3-25th.Taboo Mk IVI;Rega RP3 w/25th mods PS Audio:DMP+DSD,P10,NPC,PowerBases,AC-12 pcs; Mapleshade:SamsonV2+V3,double helix Plus spkr cbl;Oppo UDP205;VooDoo:Cremona+Amati,Iso-Pods; headphones: PM1,HD800S,LCD-
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Archie
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Posts: 1834
Re: OA3 Tube Flash at Shutdown
Reply #3 - 01/11/15 at 20:25:41
 
Completely normal.  Look at page 11 of the ZMA manual.
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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: 16545
Re: OA3 Tube Flash at Shutdown
Reply #4 - 01/11/15 at 20:54:43
 
Interesting to find that there. I have never observed this behavior with OA3s in my two Torii Mk IIIs.
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HR-1,ZTPRE,ZBIT,ZROCK2,SE84UFO3-25th, CSP3-25th.Taboo Mk IVI;Rega RP3 w/25th mods PS Audio:DMP+DSD,P10,NPC,PowerBases,AC-12 pcs; Mapleshade:SamsonV2+V3,double helix Plus spkr cbl;Oppo UDP205;VooDoo:Cremona+Amati,Iso-Pods; headphones: PM1,HD800S,LCD-
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Archie
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Posts: 1834
Re: OA3 Tube Flash at Shutdown
Reply #5 - 01/11/15 at 21:18:30
 
I'm guessing it has to do with the way the capacitors drain after shutdown.  Now I'll have to watch my ZMA.  They do flicker on startup though.
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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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Paul64
Verified Member
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Posts: 11
Re: OA3 Tube Flash at Shutdown
Reply #6 - 01/11/15 at 22:33:30
 
Thanks everyone for your comments. That's kinda what I thought.  And now that everyone seems to have the same experience...I feel much better.  Again...great forum....great information....great products from Decware.

Thanks again,
-Paul
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Lon
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"Love without
guts is
worthless!"
Philip K. D*ck

Posts: 16545
Re: OA3 Tube Flash at Shutdown
Reply #7 - 01/11/15 at 22:41:16
 
Yes, the ZP3 is a real jewel!
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HR-1,ZTPRE,ZBIT,ZROCK2,SE84UFO3-25th, CSP3-25th.Taboo Mk IVI;Rega RP3 w/25th mods PS Audio:DMP+DSD,P10,NPC,PowerBases,AC-12 pcs; Mapleshade:SamsonV2+V3,double helix Plus spkr cbl;Oppo UDP205;VooDoo:Cremona+Amati,Iso-Pods; headphones: PM1,HD800S,LCD-
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hdrider
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On the path with
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Posts: 518
Re: OA3 Tube Flash at Shutdown
Reply #8 - 01/13/15 at 21:33:57
 
My OA3 in the ZP3 flashes on shut down also. First time I saw that I counted and it seemed to be every second (1001, 1002 etc) till about 8 flashes and it stopped. I remembered Steve's comment in the manual and figured it was the caps letting go. This phono stage is amazing. I had to go back to my old Shinon Red LMC when the Alpha Genesis failed and it mates up SO well with the ZP3, totally floored. Don't worry about the flashing.
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CSP3, Rachael, ZP3, ZMC 1, Oppo BDP-93, Sota Star TT w/ FR-64, Dynavector D17 DX Moving coil, Omega 7XRS Mk 2 walnut, DeepOmega 8 sub, Morrow Audio PH3 and MA3 IC's, Gamma Electrostatic phones.
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