The Woo Audio 2
Nov 1, 2021 at 3:50 PM Post #1,576 of 1,644

bpiotrow13

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Although the changes that caps bring will be much smaller than tubes, caps do have their own sound characteristics. I don't know the brand behind Woo's Black Gate caps, Mundorf/Audio Note/Jensen/etc are normally considered "premium" caps, and are outrageously expensive - very low performance/price ratios.

For more sound characteristics of caps, I recommend you read the following thread, and see if you can find some caps that suit your need.
https://www.head-fi.org/threads/orgy-of-capacitors-the-cap-thread.284863/
Thanks, will go through. May well be not worth the price as i understand.
 
Nov 6, 2021 at 11:48 AM Post #1,578 of 1,644

bpiotrow13

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Is it necessary to have the tubes you buy "balanced" as well as matched for Power tubes on the WA2? I am thinking about picking some up and the options are: "matched" and also "balanced" Do I need to do both? I guess I don't know what "balanced" means.
Me neither:) i guess balanced means they have close emission levels. I know many people ignoring matching and living perfectly happy with that.
 
Nov 6, 2021 at 1:16 PM Post #1,579 of 1,644

exchez

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Is it necessary to have the tubes you buy "balanced" as well as matched for Power tubes on the WA2? I am thinking about picking some up and the options are: "matched" and also "balanced" Do I need to do both? I guess I don't know what "balanced" means.
Each tube has two triode sections. When they're balanced each section will produce about the same amount of gain. Some amps use only one tube to amplify the right and left channels thru each triode section. In that case, it's important to have them balanced. The WA2 uses separate tubes for the right and left channels so the tubes only need to be matched against each other, but don't need to be internally balanced.
 
Nov 6, 2021 at 5:19 PM Post #1,580 of 1,644

MisterMoJo

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Each tube has two triode sections. When they're balanced each section will produce about the same amount of gain. Some amps use only one tube to amplify the right and left channels thru each triode section. In that case, it's important to have them balanced. The WA2 uses separate tubes for the right and left channels so the tubes only need to be matched against each other, but don't need to be internally balanced.
awesome! thank you!
 
Nov 10, 2021 at 12:13 PM Post #1,581 of 1,644

Onik

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I'm almost done with my upgrade, I'm really new to tube circuit design, so I have a question whats the reason for that 100uf Cap to Ground? 20210919_165202~2.jpg

This is how my upgrade looks so far, I had issues with ground loop/hum for that 100uf cap but after soldering to its original ground the hum is gone.
20211108_161856.jpg
 
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Nov 10, 2021 at 1:23 PM Post #1,582 of 1,644

bpiotrow13

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I'm almost done with my upgrade, I'm really new to tube circuit design, so I have a question whats the reason for that 100uf Cap to Ground? 20210919_165202~2.jpg

This is how my upgrade looks so far, I had issues with ground loop/hum for that 100uf cap but after soldering to its original ground the hum is gone.
20211108_161856.jpg
Impressive! Let us know how the sound changed:)
 
Nov 11, 2021 at 8:13 AM Post #1,583 of 1,644

hodgjy

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I'm almost done with my upgrade, I'm really new to tube circuit design, so I have a question whats the reason for that 100uf Cap to Ground?

This is how my upgrade looks so far, I had issues with ground loop/hum for that 100uf cap but after soldering to its original ground the hum is gone.
It looks like you answered your own question! :)

The cap here helps filter out noise, usually high frequency, but it looks like in this design it also helps with mains hum.
 
Nov 13, 2021 at 2:57 AM Post #1,584 of 1,644

billyleungkt

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Hello WA2 guys. I just place my order on wa2. I have read TS5998 is the best currently available. But i also see some variations. 1. Top getter 2. Bottom getter. which is the better one as 2. Is more exp.

For driver tubes, do you suggest these 2 to get different sound signature? What else i can look for?
1. Amperex 6dj8 bugle boy
2. JAN-Sylvania 7308

Cheers
 
Jan 23, 2022 at 12:27 PM Post #1,585 of 1,644

Onik

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Impressive! Let us know how the sound changed:)

Sorry for late response, I didn't have enough time and energy to try/burn the amp after the upgrade, but my first impression was great! the first thing I noticed was that the shouty vocal that I heard before the mod is now gone.

I tried 470uf/480uf Sic-Safco SICAL/RELSIC axial electrolytic for output coupling.

I bought them from ebay and I found 470uf brand new from this seller: https://www.ebay.co.uk/itm/2-x-470U...=p2349624.m2548.l6249&mkrid=710-127635-2958-0

I also checked the ESR and they are matching with their datasheet value, so I assumed these old caps are still good.

HP I tried so far: SEN HD 650, AT R70X, AKG K702.

the only hp that impressed me HD650/ATH R70X.

I'm not really sure I'm 100% happy with the sound after upgrade but it sounds a bit more analytical with very Balanced Bass response and has more Airy sound than before.

With the stock tubes it sounds almost like a solid state amp.

but with MULLARD 6080 it gave that warmish sound I was looking for.

I also feel like the old Output coupling caps im using is failing because sometimes it sounds dull, I'll be soon upgrading the output coupling caps with Mundorf Mkp 330uf(250v) but for its huge Dimensions im now struggling to fit them inside WA2s chassis.

My new idea is I'll be using some screw extension and buy some woods/aluminium flat bar to hide the gaps, otherwise its gonna look ugly like this LOL : 20220118_141936~2.jpg

Once im done with my laziness, I'll start this chassis mod and post my final impression after upgrading my output coupling caps with Mundorf MKP soon here.

Edit: 20220127_211617.jpg
Tried Mundorf MKP Classic 330uf(250v), I was so damn impressed with the sound❕More Low End Details on every headphones I tried including AKG K702(65th Ani)❕instruments Separation also gotten really better, now I feel like I'm really enjoying the warmth from an OTL amp.


I didn't expect K702 to sound so good with WA2 cus this amp only sounds good with high impedance headphones which I knew before I bought this amp.

I believe that using Film caps for output coupling makes big difference to the sound, and whoever says passive components don't then they must use their Ears👂🏽carefully❕

Final Chassis Mod coming soon...
 
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Feb 14, 2022 at 4:48 AM Post #1,586 of 1,644

jclyle

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I have a Valhalla 2 along with 12Axx to 6922 adapters, and a stash of 12Axx tubes.
Does the WA2 behave when using these adapters with 12AT7 or 12AU7 tubes? I don't see them listed in the compatibility chart on wooaudio.com
 
Feb 14, 2022 at 11:07 AM Post #1,587 of 1,644

billerb1

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I have a Valhalla 2 along with 12Axx to 6922 adapters, and a stash of 12Axx tubes.
Does the WA2 behave when using these adapters with 12AT7 or 12AU7 tubes? I don't see them listed in the compatibility chart on wooaudio.com
They are all that I use...after going thru so many 6922 types. My favorites:
https://www.ebay.co.uk/itm/274128808004
https://www.langrex.co.uk/products/...mium-rft-german-gold-pin-nos-valve-tube-lc39/
https://www.ebay.com/itm/325012251227?hash=item4bac3d625b:g:l5AAAOSw-Opg6ygQ


Bigger, more open sound. More nuance, much more natural timbre. More like being in the studio. Good luck.
 
Feb 15, 2022 at 12:41 PM Post #1,588 of 1,644

jclyle

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Its been about 7 years since I've had a WA2, now I'm debating picking another one up. All I recall from the older one I had was that it was slow, and verrrry tubey sounding. I probably wasn't using the best cans with it at the time, and had a basic DAC...

Now I've got a much better source, and 300ohm cans that would work well with it. There haven't been many recent reviews for WA2, so I'm curious how the new models perform with rock & roll. I prefer a fast and detailed sound, and have no problems swapping tubes, its part of the fun to me :)

I have 12Axx to 6922 adapters along with Brmiar Footscray's, RFT foil 12AT7s, and other 6922 upgrades ready to pop in if I end up ordering a WA2!
 
Feb 15, 2022 at 12:58 PM Post #1,589 of 1,644

jonathan c

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• The older WA2 had preamp out capability, the newer WA2 do not: concentration on h/p/a circuitry, I assume.
• I do get fast and detailed sound and immense soundstage. My current (🤣) tube lineup in the WA2 is: RFT EZ81 foil getter (rectifier); GEC CV5008 (power); RFT ECC81 foil getter (driver). No molasses or treacle sound here! No solid-state sound here either! This lineup has been in place for eight+ months. I have rolled other 6080s and 12AT7s but the RFT EZ81s stay.
71DFDFDD-163F-4A79-BB45-00F67D186E49.jpeg
 
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Feb 17, 2022 at 1:24 PM Post #1,590 of 1,644

billerb1

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• The older WA2 had preamp out capability, the newer WA2 do not: concentration on h/p/a circuitry, I assume.
• I do get fast and detailed sound and immense soundstage. My current (🤣) tube lineup in the WA2 is: RFT EZ81 foil getter (rectifier); GEC CV5008 (power); RFT ECC81 foil getter (driver). No molasses or treacle sound here! No solid-state sound here either! This lineup has been in place for eight+ months. I have rolled other 6080s and 12AT7s but the RFT EZ81s stay.71DFDFDD-163F-4A79-BB45-00F67D186E49.jpeg
Jonathan, I think it's time to step up to the GEC 6AS7G's. It is. Me, I'm going to check into those foil getter RFT EZ81's of yours !
 

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