#1
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A minor problem with GAT
Just wanna ask other owners if they have experienced tube hiss with their GAT as I do. Changed the stock 6922s several times ( with the same brand EH) and could not eliminate the hiss. In fact it grows louder and louder over time. Should I try other brands? I already tried NOS and cryo tubes but could not get the zest that the stock EHs deliver. Got my GAT brand new almost 2 years ago and the hiss was there from the start.
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#2
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Quote:
Bob
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Amps:VAC 450iQ Monos in Silver Flake on HRS M3X2-1921's, HRS G7 Footers/G-Links & Sound Anchor Conecoasters. Preamp:VAC Statement (on order) (Silver Flake) Digital Source: dCS Rossini CD/SACD Transport, Vivaldi APEX DAC, Upsampler Plus & matching Clock (Silver) Analogue Preamp:VAC Renaissance SE Phono stage in Silver Flake with XLR Output Option & with Nordost Valhalla XLR's. Analogue Sources:SME 20/2 w/SME V arm & Nordost Odin 2 Tone Arm Cable, Palo Santos Presentation Cartridge & Akai GX-400D Reel-to-Reel w/relapped heads by JRF Magnetic Sciences. Akai RC-17 cabled remote (original owner since 1974). Vibration Control:TT on HRS M3X2-1921 shelf. Speakers:Wilson Audio Alexia V (on order in Ferrari Argento Silver/Parchment grills sitting on Acoustic Diode Kit). Power Cables:4 Nordost Odin Supreme Reference on amps, preamp & DAC. Ansuz Acoustics C2 on Transport & Clock. Power Distribution:Ansuz Mainz D3 Distributor & Ansuz Mainz C2 1M Power Cable Power Outlets:Furutech GTX-D NCF (R) duplex outlet, GTX Wall Plate & Duplex Cover (x2) on dedicated, same panel phase, 20A breakers. Speaker Cables:2M Nordost Odin 2 Supreme Reference on Nordost Sort Lifts. Signal Cables:Nordost Odin XLR's on dCS DAC & Amps. Digital Cables: Nordost Odin 2's, 110-ohm AES/EBU on dCS Transport to DAC. Clock Cables:5 each 75 ohm 1.25M Nordost Valhalla BNC/BNC Digital Ethernet Cable: WireWorld Platinum 1M Starlight® 8 Twinax Headphones:Vintage Koss Pro IV AA. RCM: Audio Desk PRO Tube Test Gear:Mint late '60's/calibrated Heathkit TT-1A, MaxiMatcher Power Amp & Preamp & Space Tech Labs ATT-3.02 tube test sets. |
#3
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This is a problem with the tubes. There was a defective batch of EH tubes that are known to have this problem. You can try to get some NOS tubes or other brand tubes. The Matsushita 7DJ8 worked great for me and sounded much better.
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#4
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Hi Bob, even at very low levels the hiss is there and grows progressibly louder as you crank up the volume.
ronenash, thanks for the tip. |
#5
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One more thing. You can call CJ and they will tell you if your tube is from the defective series. They will also send a replacement if needed. I will still try to get a good tube to replace the EH, it will sound better.
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#6
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Thanks ronenash but FYI, I have a lot of EH 6992s which I got from different sources but with the same result.
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#7
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ET5 with various tubes installed over the ages.... A few are definitely more "hissy" than others. In a few cases a new tube would go bad and become audibly noisy in some amount of time. However, in general, with my system, if I crank the volume on the ET5 to 99, (no music playing!) only then do I hear a slight amount of hiss and hum. Anything below about 97 is dead quiet, and this test is "ear-against-the-speaker" Even at 99, from my listening position, it'd be hard to hear anything at all. Are you literally hearing hiss, at typical volume settings, at or near your listening position? Do you have EXTREMELY sensitive power amp+speakers? I'd definitely give CJ a call if you've not. I think the GAT is rated, S/N wise even better than ET5. and my ET5 absolutely hiss-less. Last edited by Rayooo; 08-07-2012 at 12:00 PM. |
#8
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You can check if the date codes on the tubes are the same. If so they are from the same batch.
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#9
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Quote:
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Lumin P1 streamer/DAC/preamp, Constellation Inspiration integrated TT: Michell Gyro SE MkII, SME V, Koetsu Urushi Vermilion, EAR324. Harbeth 30.2s, REL R-305, Shunyata Alpha V2 ICs, Alpha V2 SPs, Sigma XC, Sigma NRv2, Omega QR-s & Alpha NRv2 PCs, segmented Altaira SG stack w/ Alpha & Omega CGCs, Everest 8000 PD. Remote Server Room: Uptone EtherREGEN, AfterDark Master Clock & LPS, Alita, Battle Angel, (Akasa NUC Roon Core), iFi DC Purifiers (for SMPS used for Alita & router), Shunyata Gemini combo power distributor & Altaira-type CG GP-NR hub, Venom & Alpha CGCs, Shunyata NRv14 power cords for digital components. |
#10
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Running EHs in the GAT here and no hiss.
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Wilson Yvette speakers, Conrad-Johnson ART88 pre, TEA1bc phono, and ART27A Amplifier, Marantz digital player, Rega Planar 10 turntable / Apheta 3 cartridge,Wireworld Gold and Platinum Eclipse IC and speaker, I AQ Hurricane, Tornado power cables, Shunyata Denali 2 conditioner, dCS Bartok DAC/Streamer |
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