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New Production Tube Woes. (Read 406 times)
GroovySauce
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New Production Tube Woes.
05/30/20 at 16:04:45
 
I bought a pair of Gold Lion 6922 from upscale audio.

Currently running a ZMA.

After a few days the left channel developed a very high pitched tone. It was intermittent. Some days it wouldn't happen at all. Other days it would start and not stop. Then somedays it would come and go. I would get up to investigate and it would stop. This is why I thought it was an interference or grounding issue. Eventually I swapped the input tubes. The sound followed the tube.

After 15 days of use, I sent the tube back to Upscale and they replaced it quickly no questions asked.

I put the new tube in and all was well. After 3-4 days the noise started again very softly. Again the left channel. If I was smarter I would have made a mark on the tubes to see which was the new one and which had a few days use on it.

Have I had a string of bad luck or is something else going on?

Anyone else have issues with the GL 6922?

I've had 2 Electro harmonics 6922 get "windy" and "scratchy" with less than a months use.

Is this just the reality of new production tubes?

The price of NOS tubes has been increasing so I want to figure out some good new production options.
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Archie
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Re: New Production Tube Woes.
Reply #1 - 05/30/20 at 17:40:51
 
Sorry about the tube whine. I had a similar issue with a Tungsram PC88 that I had in the lead position of my CSP3. I also use them in my ZMA. The tube that went bad was in for about one year. I replaced it with a Russian 6N1P-EV. (I think the EV is the military version and are more stoutly built.) Those are great tubes and are readily available from ebay sellers. I like them in my CSP3 and ZMA but I like the Tungsram a bit better. The Tungsram are MUCH more expensive than the 6N1P-EVs. The last time I bought the latter I paid $25 for ten, delivered. My last Tungsram cost me $17 each!
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GroovySauce
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Posts: 75
Re: New Production Tube Woes.
Reply #2 - 06/10/20 at 12:25:58
 
Seems I got a bad batch of tubes.

I had 2 GL 12ax7 and 1 GL 12au7 all bad. 12au7 stopped working completely the 2 12ax7s were super weak.

I actually sent the ZP3 back to the Mothership thinking it was the amp that was having problems!

I've really been enjoying the GE 5760w with adapters in the 6922 slot of the ZMA. I ended up buying a bunch at $4 so I might give up on looking for a current production 6922 for now.
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Lon
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Re: New Production Tube Woes.
Reply #3 - 06/10/20 at 12:51:08
 
I hear you. I have given up trying to find dependable new production input tubes that sound decent, I use old stock.

Those 5670W you are using are good inexpensive tubes. I've been lucky--I discovered a very interesting tube that possibly SHOULDN'T work in my SE84UFO3-25 Monoblocks and Taboo MK IV-25 DOES work and sounds fantastic to me: the 6085. I've tailored the system around these in the amps and ZROCK2 and I've been using Steve's meticulously tested and matched NOS 6N5P in my ZTPRE and Amperex 7308 from Holland in my CSP3 with the 25th Anniversary mods. Not the cheapest tubes on the planet, more expensive than those GE, but long-lasting and for me, like Goldilock's porridge, just right.
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GroovySauce
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Posts: 75
Re: New Production Tube Woes.
Reply #4 - 06/11/20 at 16:40:34
 
Lon,

I picked up 1 Northern Electric 12ax7 and 12au7. They are custom commissioned for thetubestore.com

3 days ago I put the NE 12au7 in the ZROCK2. Wow shimmering highs! it was a little lean sounding. After 3 days it's filled out the midrange and the bass is quick and tight. I think it's a keeper.

$53 bucks matched and balanced. Compared to the NOS Amperex 6085 at ~$100 might be well worth it.

I'm tempted to try the Amperex 6085. If it smokes the NE then I'll be bummed. If it's close or I prefer it, I'll be a happy camper.

I'm really resisting NOS tubes. I'm still in my 30's so I don't want to see what NOS tube prices and availability are like in 40-50-60+ years. Maybe, this isn't the correct way to go about it though. \_(ツ)_/

I just ordered 1 more NE 12ax7 and 12au7 so I can try running a full boat of them in the ZP3 and Zrock2.

I had a NOS GE 5670w go microphonic last night.

NE and GL next to each other. " alt="" title="" border="0" />
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Lon
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"Love without
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worthless!"
Philip K. D*ck

Posts: 16762
Re: New Production Tube Woes.
Reply #5 - 06/11/20 at 16:51:23
 
I'm glad you are enjoying the new tube. Don't pay 100 dollars for an Amperex 6085. Recently I've purchased one Adzam (same tube as the Amperex, different Philips brand, same factory) for 25, one Philips (same tube as the Amperex, different Philips brand, same factory) for 50 and a sleeve of five Amperex for 150. I'm good for quite some time! Wait and look and you'll likely find one at a good price.
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HR-1,ZTPRE,ZBIT,ZROCK2,SE84UFO3-25th x2, CSP3-25th.Taboo Mk IV; Rega RP3 w/25th mods PS Audio: DMP+DSD,P15,NPC,PowerBases,AC-12 pwr cbls, Statement spkr cbls; Mapleshade:Samson V3; Oppo UDP-205; VooDoo:Cremona+Amati intrcncts, Iso-Pods; headphones: PM1,HD800S,LCD-
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GroovySauce
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Posts: 75
Re: New Production Tube Woes.
Reply #6 - 06/11/20 at 17:09:30
 
Thanks Lon, I'll keep an eye out for them.
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Rega P8 | SS Zephyr MIMC Star | Roon + HQplayer | MicroRendu | PSA DSD | ZP3 25th ZMC1 | ZRock2 25th | ZStage 25th | Torii MKiv 25th | Argon 7Ls | Analysis Plus Solo Crystal | Zenwave Speaker Cable | Curious Evolved USB .2m
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GroovySauce
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Posts: 75
Re: New Production Tube Woes.
Reply #7 - 06/11/20 at 21:20:25
 
Good news! I hope I'm not jumping the gun Smiley

I don't want to jinx myself. It now seems that it was the inverter tube that was causing the issue! I was only considering the input tubes.

Over the next few days I'm going to put some of the tubes I thought were bad in and see what happens.

EDIT: The really weird thing is when I swapped the input tubes the sound followed the suspect tube!
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Rega P8 | SS Zephyr MIMC Star | Roon + HQplayer | MicroRendu | PSA DSD | ZP3 25th ZMC1 | ZRock2 25th | ZStage 25th | Torii MKiv 25th | Argon 7Ls | Analysis Plus Solo Crystal | Zenwave Speaker Cable | Curious Evolved USB .2m
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