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Anyone Tube Roll with the ZMA yet? (Read 212956 times)
Jeff of Arabica
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Name the greatest of
all inventors...
Accident.

Posts: 926
Re: Anyone Tube Roll with the ZMA yet?
Reply #700 - 02/06/20 at 05:34:48
 
Quote:
Say Jeff,

what is your Canary Audio Grand Reference..??
is it a preamp, how do you like it...


Hey Delta,
The Canary Audio Grand Reference are 300B based mono block power amps.  They are the successor to the Reference Two model.  The Grand Reference amps aren't even listed on the website yet.  

There are a lot of really nice pre-amps out there.  Tough part is knowing which one will be best suited for your system.  I am using a Purity Audio Design Reference II pre-amp in front of my Grand Reference's and it is a beautiful match.  Bill Baker is know for his pre-amp prowess.  But, the Purity line is no longer produced.  

BTW, I love ZMF headphones.  It is what brought me to Decware back in the day.
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Canary Audio Grand Reference//ZMA//Zen Ultra//Taboo MKIII//PS Audio DirectStream DAC + Memory Player + P10//Canary Audio MC-10 Phono Stage//London Decca Reference//Dynavector DV-507 MKII//SonoruS Reel-to-Reel w/ tube playback pre-amp//Tannoy Westminster Speakers
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Jeff of Arabica
Seasoned Member
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Name the greatest of
all inventors...
Accident.

Posts: 926
Re: Anyone Tube Roll with the ZMA yet?
Reply #701 - 02/06/20 at 05:36:23
 
Quote:
Delta,

A couple years ago Steve told me that he ran KT88s in his ZMA and admitted that it might shorten some component life but that he'd take the chance (since he IS the factory).  I don't think you're looking at anything catastrophic.  If you are careful and don't leave the amp on all day you'll likely be just fine.  Get an IR thermometer and monitor the transformers.  If you can keep you hand on them for a few seconds they should be well within the OK range.  It typically takes hours for things to really heat up.

If you look at the original ZMA development thread, Steve spec'd the bias at 60mA.  He then dropped it to 50mA to be absolutely safe.  That's where I started but I'm up to 68mA all day with no heat problem.  The ZMA is a tank and can take a little experimenting.

It's good to be aware of the pitfalls but I think you can navigate them easily.


Well stated sir!
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Canary Audio Grand Reference//ZMA//Zen Ultra//Taboo MKIII//PS Audio DirectStream DAC + Memory Player + P10//Canary Audio MC-10 Phono Stage//London Decca Reference//Dynavector DV-507 MKII//SonoruS Reel-to-Reel w/ tube playback pre-amp//Tannoy Westminster Speakers
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HockessinKid
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Posts: 462
Re: Anyone Tube Roll with the ZMA yet?
Reply #702 - 02/09/20 at 14:25:05
 
Started to get some tube crackling noises in both channels last week. After some amp & preamp tube swapping I determined it was my ZMA power tubes. So after ~2,400 hours I swapped in my spare set of Tube Amp Doctor (TAD) 7027a tubes and the noise is gone.

These TAD tubes have exceptional tonality and soundstage depth. With the new set the music seems even more powerful, clear, and seductive. A noticable difference from the "tired set." I have them biased at 62mA - rock solid.

I highly recommend the TAD's. The TungSol 7027a''s are also excellent, but the TAD's tubes just really suck me into the music. Matched quads are available from StewMac. The only U.S. based online retailer I have found. They're running a 10% off sale now, $149.99 for a matched quad.

HK
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Nottingham Interspace TT w/ Dynavector 20x2LO cart + Modwright PH 9.0 phono pre > ZROCK2-25th OR Modwright modified Cambridge CNX V2 > CSP3-25th preamp > ZMA-25th amp > PI Audio Group UberBUSS PC > Omega SAHO XRS or Caintuck Audio Lii 15 speakers > various cables.
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Archie
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Posts: 1975
Re: Anyone Tube Roll with the ZMA yet?
Reply #703 - 02/09/20 at 17:50:58
 
Hock,

What's the story on the TAD tubes?  Are they rebranded tubes?  If so, do you know who makes them?  At some point I'll get another quad of the 7027As.
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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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HockessinKid
Seasoned Member
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Posts: 462
Re: Anyone Tube Roll with the ZMA yet?
Reply #704 - 02/09/20 at 18:26:45
 
Archie,

They are German designed, built in China. Beefier than the TungSol tubes, the TAD Premium Select are well tested and higher quality. They have tighter tolerances with better matching of sets.

Here's a link, check out the description for more information:

https://www.tubeampdoctor.com/en/7027a-tad-tubes-tad-premium-matched

HK
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Nottingham Interspace TT w/ Dynavector 20x2LO cart + Modwright PH 9.0 phono pre > ZROCK2-25th OR Modwright modified Cambridge CNX V2 > CSP3-25th preamp > ZMA-25th amp > PI Audio Group UberBUSS PC > Omega SAHO XRS or Caintuck Audio Lii 15 speakers > various cables.
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Lon
Seasoned Member
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"Love without
guts is
worthless!"
Philip K. D*ck

Posts: 16947
Re: Anyone Tube Roll with the ZMA yet?
Reply #705 - 02/09/20 at 19:03:29
 
As far as I have been able to determine TAD (Tube Amp Doctor) is a German company that designs tubes that are manufactured in China and sells them. I have had great luck with TAD power tubes and input tubes both sonically and with dependability.
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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,ZMF Ori
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Archie
Seasoned Member
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Posts: 1975
Re: Anyone Tube Roll with the ZMA yet?
Reply #706 - 02/15/20 at 19:04:39
 
Hock,  I was locked out of the Decware sites for the past week.  Maybe Steve's Audio Gods know why?   Undecided

Is there a coupon code for that TAD 10% off?  I notice that I save the 19% VAT which might be an extra enhancement.
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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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HockessinKid
Seasoned Member
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Posts: 462
Re: Anyone Tube Roll with the ZMA yet?
Reply #707 - 02/15/20 at 23:54:22
 
Archie,

Just checked the StewMac website. Looks like this sale is over. You might consider signing up for their updates. The tubes go on sale 3-4 times a year.

HK
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Nottingham Interspace TT w/ Dynavector 20x2LO cart + Modwright PH 9.0 phono pre > ZROCK2-25th OR Modwright modified Cambridge CNX V2 > CSP3-25th preamp > ZMA-25th amp > PI Audio Group UberBUSS PC > Omega SAHO XRS or Caintuck Audio Lii 15 speakers > various cables.
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Archie
Seasoned Member
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Posts: 1975
Re: Anyone Tube Roll with the ZMA yet?
Reply #708 - 02/16/20 at 18:41:50
 
Will do.  The shipping to the US is pretty steep.
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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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HockessinKid
Seasoned Member
****




Posts: 462
Re: Anyone Tube Roll with the ZMA yet?
Reply #709 - 07/25/20 at 14:09:54
 
Argh, 2nd set of Tube Amp Doctor 7027a power tubes started failing after ~1100 hours. Moving on to a set of TungSol's. I hope I get more life out of these. BTW, biased these at 52mA.

Oh well, time to order another back up set. I've only got six various quads left😁.

HK
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Nottingham Interspace TT w/ Dynavector 20x2LO cart + Modwright PH 9.0 phono pre > ZROCK2-25th OR Modwright modified Cambridge CNX V2 > CSP3-25th preamp > ZMA-25th amp > PI Audio Group UberBUSS PC > Omega SAHO XRS or Caintuck Audio Lii 15 speakers > various cables.
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Archie
Seasoned Member
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Posts: 1975
Re: Anyone Tube Roll with the ZMA yet?
Reply #710 - 07/25/20 at 17:21:49
 
Good to know about the TADs.  I've resisted them due to price so I think I'll go with more Tung Sols.  BTW, last time I looked there were a couple affordable NOS and slightly used quads of RCA and GE on ebay.  (I bias much higher, 64 to 68 mA.)
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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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Archie
Seasoned Member
****




Posts: 1975
Re: Anyone Tube Roll with the ZMA yet?
Reply #711 - 07/25/20 at 19:07:43
 
Hock, I just bought 2 quads of the Tung Sol 7027A from the same guy who sells on ebay but direct from his site.  I saved on both the tubes and the tax!

https://vacuumtubevalues.com/product/tung-sol-factory-platinum-matched-quad-four...
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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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HockessinKid
Seasoned Member
****




Posts: 462
Re: Anyone Tube Roll with the ZMA yet?
Reply #712 - 07/25/20 at 19:26:37
 
Thanks Archie, looks very good.

HK
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Nottingham Interspace TT w/ Dynavector 20x2LO cart + Modwright PH 9.0 phono pre > ZROCK2-25th OR Modwright modified Cambridge CNX V2 > CSP3-25th preamp > ZMA-25th amp > PI Audio Group UberBUSS PC > Omega SAHO XRS or Caintuck Audio Lii 15 speakers > various cables.
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Archie
Seasoned Member
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Posts: 1975
Re: Anyone Tube Roll with the ZMA yet?
Reply #713 - 08/01/20 at 19:40:45
 
I got my 2 quads of Tung-Sol 7027As from Vacuum Tube Values.  These seem to be very closely matched and are supposed to have been burned in for 24 hrs prior to matching.

These are by far my favorite ZMA power tubes.  These, in conjunction with Tungsram PC88s in the ZMA and lead place in the CSP3 give me the clearest and most realistic sound so far.

I'm biasing at 68mA which is below the midpoint of where these tubes will bias on my amp.
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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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