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WA22 let's roll some tubes (Done Mod, Burnning-in) - Page 20

post #286 of 402
Thread Starter 
Quote:
Originally Posted by Clayton SF View Post
Would you spend $$$ on NOS Mullard GZ34 or the like or spend about the same $$$ on current production tubes like the Sophia, etc. I know they're different but if you wanted to save up for a nice tube which would you spring for--NOS or current production? Thanks!
What kind music do you listen to? What headphone do you mainly use?
post #287 of 402
Thread Starter 
Today from Dan:

The mod is coming along well and I feel that the MWI cpacitors are now broken in and the result is FANTASTIC. The grid-stop resistors (Riken Carbon film) go in today and I will order the remaining electrolytic capacitors for the power supply. It will be done and burned in, in time for the meet.


I have not had a chance to either evaluate the Wu as a preamp or my preamp as a headphone amp, but I will at least try to evaluate your Wu as a preamp today and report.


Thanks!


Dan

President, ModWright Instruments Inc (MWI)
post #288 of 402
Quote:
Originally Posted by Seamaster View Post
What kind music do you listen to? What headphone do you mainly use?
I love all kinds of music but gravitate between two worlds: Extremely dynamic symphony orchestras--big sound: give the first cut a listen--it's sonically WILD! Rachmaninoff: Symphonic Dances; to technical studio recordings like Grizzly Bear, Pink Floyd, David Byrne (w/Brian Eno, "My Life In The Bush Of Ghosts). Ah, yes, and then there is jazz. Cool jazz. Like early Miles Davis, and current artist Michel Camilo (thanks to atbglenn ). The headphones I primarily use are the HD650 but often use the K701 as well (which are better suited, at least to my ears, for acoustic guitar works whether it be folk, flamenco, gypsy, or classical).
post #289 of 402
Quote:
Originally Posted by Seamaster View Post
Today from Dan: The mod is coming along well and I feel that the MWI cpacitors are now broken in and the result is FANTASTIC. The grid-stop resistors (Riken Carbon film) go in today and I will order the remaining electrolytic capacitors for the power supply. It will be done and burned in, in time for the meet.

I have not had a chance to either evaluate the Wu as a preamp or my preamp as a headphone amp, but I will at least try to evaluate your Wu as a preamp today and report.

Thanks!

Dan
President, ModWright Instruments Inc (MWI)
Wow. Consider yourself very fortunate. Not very many of us will be able to experience your new Woo. I wish I could make it up there to Seattle to be part of that meet.
post #290 of 402
Thread Starter 
Quote:
Originally Posted by Clayton SF View Post
I love all kinds of music but gravitate between two worlds: Extremely dynamic symphony orchestras--big sound: give the first cut a listen--it's sonically WILD! Rachmaninoff: Symphonic Dances; to technical studio recordings like Grizzly Bear, Pink Floyd, David Byrne (w/Brian Eno, "My Life In The Bush Of Ghosts). Ah, yes, and then there is jazz. Cool jazz. Like early Miles Davis, and current artist Michel Camilo (thanks to atbglenn ). The headphones I primarily use are the HD650 but often use the K701 as well (which are better suited, at least to my ears, for acoustic guitar works whether it be folk, flamenco, gypsy, or classical).
So, no hard rock and punk. For your tast EML is better choice than Sophia. Sophia may make K701 sound too sharp. EML is all around good perfermer.
post #291 of 402
Quote:
Originally Posted by Seamaster View Post
So, no hard rock and punk. For your tast EML is better choice than Sophia. Sophia may make K701 sound too sharp. EML is all around good perfermer.
+1 for EML. It's great with the more 'laid-back' type of rock. It's even good with stuff like Rush. The sound I get is great with the tubes I have now: EML 5U4G Mesh, Tung Sol 6F8Gs, stock GE 6AS7GAs... but I did EQ 5kHz and 7kHz down 2dB, which takes the edge off of voices in certain songs.

The only bad thing about the EML is it's not facing forward! I'll have to re-align my tube socket once my fingers heal.
post #292 of 402
Quote:
Originally Posted by TheAudioDude View Post
+1 for EML. It's great with the more 'laid-back' type of rock. It's even good with stuff like Rush. The sound I get is great with the tubes I have now: EML 5U4G Mesh, Tung Sol 6F8Gs, stock GE 6AS7GAs... but I did EQ 5kHz and 7kHz down 2dB, which takes the edge off of voices in certain songs.

The only bad thing about the EML is it's not facing forward! I'll have to re-align my tube socket once my fingers heal.
Why isn't the WA22 socket aligned to show off the tube in the first place? I know it's entirely a cosmetic call but don't you think it may be a design issue as well? I know nothing about amp design so it's just a wild guess on my part.
post #293 of 402
Thread Starter 
Quote:
Originally Posted by Clayton SF View Post
Why isn't the WA22 socket aligned to show off the tube in the first place? I know it's entirely a cosmetic call but don't you think it may be a design issue as well? I know nothing about amp design so it's just a wild guess on my part.
Jack is the one to blame Maybe all sockets are points to one direction looked nice and neat wihout tubes. Or maybe the wiring. Personally I don't really care.
post #294 of 402
Quote:
Originally Posted by Seamaster View Post
Jack is the one to blame Maybe all sockets are points to one direction looked nice and neat wihout tubes. Or maybe the wiring. Personally I don't really care.
Is it true that you can ask Jack to position the sockets so that the tubes can exhibit its logo front and center? I also have some tubes from the same manufacturer that are inconsistent as to where they place their logo. I guess the more top-drawer tubes always have their logos placed at the same spot.
post #295 of 402
Thread Starter 
Quote:
Originally Posted by Clayton SF View Post
Is it true that you can ask Jack to position the sockets so that the tubes can exhibit its logo front and center? I also have some tubes from the same manufacturer that are inconsistent as to where they place their logo. I guess the more top-drawer tubes always have their logos placed at the same spot.
Yes, you could ask jack. Someone has Woo6 done that. To be honest, I never look into the positioning of the logo. Maybe I should
post #296 of 402
Sad news. I didn't win any of TS 5998 tube auction.. Someone outbid me by a few dollars. Sigh..
post #297 of 402
5998's are getting much harder to get, all of the sudden...
post #298 of 402
Quote:
Originally Posted by Skylab View Post
5998's are getting much harder to get, all of the sudden...
That seems to be the trend, for sure..
post #299 of 402
Thread Starter 
I will test that before I shut down for the night. What I did do tonight however, is completely diagram the circuit, so that I understand which components will benefit most from upgrades.

I did replace the input stage grid-stop resistors with Japanese Riken carbon films. I also bypassed the cathode capacitors on those same input tubes, with 1uf MW oil-poly caps. This is a DIRECT audio signal path and while it is necessary to use an electrolytic there, given its size, using a smaller value high-quality cap like ours to bypass it, means that the higher frequencies will pass through our cap instead of the 'lytic, improving the sound.

The carbon film resistors will make the sound has more body.

I would also like to replace the plate resistors from the input stage with Tantalum or carbon films.

All of the other electrolytic capacitors are purely in the power supply, only one exception. There are also cathode capacitors at the output tubes, that would benefit from the same MWI cap bypass.

The Nichicon caps that are used in the power supply are good. It would be difficult to do better with electrolytics without using Black Gates and they are prohibitively expensive. I am more inclined to bypass the final PS decoupling cap at each circuit, with a high quality MW cap, for the same reason as mentioned before. It is always the last capacitor in the stage, before the load, that is most important.

Please let me know your thoughts. I know that you wanted all of the 'lytics replaced, but they are not terrible and I don't know that there is necessarily a better cap (i.e. would yield real audible differences). I recapped the entire supply in my old Jolida P-P EL34 amp, amongst a NUMBER of other upgrades and while I didn't use Black Gates, I really didn't hear any difference. I got the BIGGEST improvement by replacing coupling caps (already have done so here), grid-stop resistors (also already done so here) and bypassing critical 'lytic capacitors with high-quality films. Plate resistors also made a nice difference. I will determine the value of these and get them ordered. In the meantime, I will continue to burn-in the most recent upgrades.

Thanks!

Dan

President, ModWright Instruments Inc (MWI)
post #300 of 402
Thread Starter 
Me:
will do Blackgates on my own (this) amp if their sound signature goes alone with mod. Thanks Dan.

Dan reply: no dent on sound signature.

Me:
I know use blackgate in the power supply may not do any help to improve the sound, but I already went this far, what the hell...... Just about less than $100 extra
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