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SE84UFO not working (Read 4149 times)
Geno
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Without music, life
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SE84UFO not working
08/12/18 at 19:52:06  
Help!  I’m having an issue with my SE84UFO. The input and output tubes are on, but the rectifier does not fire up. I swapped out rectifiers, but still no response. If the fuse is blown, would the input and output tubes still come on?
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(2)SE84UFO(Balanced Monoblocs) OR Sansui AU222
Cambridge Audio CXN(ModWright)
Crown XLS-1002 Sub Amp
SL-1210MK5(KAB Mods) Soundsmith Aida MKll cart • Darlingt.Labs MP8b
Otari MX5050-Bll2 R2R
ZLC Power Cond.
Lii Audio PT-10 OR Betsy 8"/W-15 in Open Baffles
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Lon
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"Love without
guts is
worthless!"
Philip K. Dick

Posts: 24285
Re: SE84UFO not working
Reply #1 - 08/12/18 at 20:04:45  
I think if the fuse were blown all tubes would not light up.

Jiggle the rectifier about and see if it connects and lights up . . . either both rectifiers are not functioning or the socket is not making a good connection?
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HR-1,ZBIT,ZROCK2,SEWE300B,CSP3-25mod; Rega RP3 all GrooveTracer mods;PSAudio:PST+DSD, DAC Mk II, P15,NPC,PowerBases,AC-12 pwr cbls, Reference spkrcbls; Mapleshade SamsonV3; VooDoo:Cremona+Amati interconnects, IsoPods; headphones: Sennheiser HD800S,ZMF Ori,Oppo PM1
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Geno
Seasoned Member
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Without music, life
would be a mistake.

Posts: 2113
Re: SE84UFO not working
Reply #2 - 08/12/18 at 21:19:56  
Lon, I have tried 4 different rectifiers. And wiggled each one in the socket, but no bananas. I shined a light into the socket to see if I could see anything that looked odd. Did not see anything suspect. Any other suggestions?
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(2)SE84UFO(Balanced Monoblocs) OR Sansui AU222
Cambridge Audio CXN(ModWright)
Crown XLS-1002 Sub Amp
SL-1210MK5(KAB Mods) Soundsmith Aida MKll cart • Darlingt.Labs MP8b
Otari MX5050-Bll2 R2R
ZLC Power Cond.
Lii Audio PT-10 OR Betsy 8"/W-15 in Open Baffles
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Lon
Seasoned Member
****


"Love without
guts is
worthless!"
Philip K. Dick

Posts: 24285
Re: SE84UFO not working
Reply #3 - 08/12/18 at 21:22:13  
There may be a fuse inside the amp to protect the rest of the amp from a rectifier failure. This is a new thing that Steve has added to some amps recently I believe. So. . . I guess taking the top-plate off and looking at that fuse may be in order. Otherwise. . . try to contact Steve as soon as you can.
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HR-1,ZBIT,ZROCK2,SEWE300B,CSP3-25mod; Rega RP3 all GrooveTracer mods;PSAudio:PST+DSD, DAC Mk II, P15,NPC,PowerBases,AC-12 pwr cbls, Reference spkrcbls; Mapleshade SamsonV3; VooDoo:Cremona+Amati interconnects, IsoPods; headphones: Sennheiser HD800S,ZMF Ori,Oppo PM1
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Geno
Seasoned Member
****


Without music, life
would be a mistake.

Posts: 2113
Re: SE84UFO not working
Reply #4 - 08/12/18 at 21:44:03  
Ok Lon. I’ll give him a call in the morning. Thanks for your help!
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(2)SE84UFO(Balanced Monoblocs) OR Sansui AU222
Cambridge Audio CXN(ModWright)
Crown XLS-1002 Sub Amp
SL-1210MK5(KAB Mods) Soundsmith Aida MKll cart • Darlingt.Labs MP8b
Otari MX5050-Bll2 R2R
ZLC Power Cond.
Lii Audio PT-10 OR Betsy 8"/W-15 in Open Baffles
  IP Logged
Lon
Seasoned Member
****


"Love without
guts is
worthless!"
Philip K. Dick

Posts: 24285
Re: SE84UFO not working
Reply #5 - 08/12/18 at 22:04:13  
You're welcome.  I would guess it would be one of the fuses inside.
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HR-1,ZBIT,ZROCK2,SEWE300B,CSP3-25mod; Rega RP3 all GrooveTracer mods;PSAudio:PST+DSD, DAC Mk II, P15,NPC,PowerBases,AC-12 pwr cbls, Reference spkrcbls; Mapleshade SamsonV3; VooDoo:Cremona+Amati interconnects, IsoPods; headphones: Sennheiser HD800S,ZMF Ori,Oppo PM1
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Geno
Seasoned Member
****


Without music, life
would be a mistake.

Posts: 2113
Re: SE84UFO not working
Reply #6 - 09/07/18 at 18:19:33  
Update on this. It was the 5A internal fuse that blew.  Back in business!
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(2)SE84UFO(Balanced Monoblocs) OR Sansui AU222
Cambridge Audio CXN(ModWright)
Crown XLS-1002 Sub Amp
SL-1210MK5(KAB Mods) Soundsmith Aida MKll cart • Darlingt.Labs MP8b
Otari MX5050-Bll2 R2R
ZLC Power Cond.
Lii Audio PT-10 OR Betsy 8"/W-15 in Open Baffles
  IP Logged
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