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Review: Woo Audio WA6 vs. WA6SE (stock units) - Page 18

post #256 of 508
Quote:
Originally Posted by Torero View Post
Is the 6fd7 worse than the 6ew7 in some area? (detail, tonality,...)


Thanks you takezo
none that i can discern... the fat bottle seems to have a slight edge in
tonality than the regular slim version... though it may just be that the
fatbottle i have has more burn-in. rca is also slightly darker than sylvania, which
some prefer for their "tubey" signature.
post #257 of 508
thanks orcin. i hope you enjoy them as i do. the added dynamics
and larger/deeper soundstage is making my 5v4g sound very close
to a sophia with 6de7.... very close.
post #258 of 508
Thread Starter 
Quote:
Originally Posted by takezo View Post
thanks orcin. i hope you enjoy them as i do. the added dynamics
and larger/deeper soundstage is making my 5v4g sound very close
to a sophia with 6de7.... very close.

I agree. The Sophia is a bit more open and wider, that's about it. The bass and impact is surprisingly close, considering the massive difference in price. The 5V4G sounds a little more tubey, but not in a bad way.
post #259 of 508
Takezo, many thanks for posting your findings with the different output tubes.
Does the 6fd7 come in a "thin" version that can be used without an adaptor, for those with the older WA6?
post #260 of 508
yes, the 6fd7 are found mostly in the normal thin version. the fat
bottle is actually less common for all of the newer output tubes.
these are not popular tube types so you should be able to locate
them at any tube dealers website for very good prices. i got most
of my tubes at $1 - 3 each... and they sound better than any 6de7
tubes i've got. i prefer them to the tungsol, and even the early 50's
u-shaped getter 6de7 too.
post #261 of 508
I have just ordered a pair of fat bottle RCA 6fd7 to try. I have not read anywhere that these are a replacement for the 6de7 or 6ew7, but I assume from your review that it is a compatible tube.
post #262 of 508

Yes..

Quote:
Originally Posted by sclamb View Post
I have just ordered a pair of fat bottle RCA 6fd7 to try. I have not read anywhere that these are a replacement for the 6de7 or 6ew7, but I assume from your review that it is a compatible tube.
Yes... they are.

I confirmed that with Jack, before I ordered some of the same to give them a try.

He said you might notice a bit of noise with very efficient, low impedance phones - but, not much. The result of their much higher output I guess. But he noted no issues with compatibility, or stress to the system, otherwise.
post #263 of 508
Great

I will be using my GS1000 so I will see if there is any audible noise.
post #264 of 508
Nice sclamb...I am interested in your findings!
post #265 of 508
Quote:
Originally Posted by takezo View Post
yes, the 6fd7 are found mostly in the normal thin version. the fat
bottle is actually less common for all of the newer output tubes.
these are not popular tube types so you should be able to locate
them at any tube dealers website for very good prices. i got most
of my tubes at $1 - 3 each... and they sound better than any 6de7
tubes i've got. i prefer them to the tungsol, and even the early 50's
u-shaped getter 6de7 too.
Thank you takezo. If Jack also doesn't think the high mu would cause the amp any damage, I'll give these a try. More dynamics and soundstage are always welcome
post #266 of 508
Quote:
Originally Posted by takezo View Post
thanks orcin. i hope you enjoy them as i do. the added dynamics
and larger/deeper soundstage is making my 5v4g sound very close
to a sophia with 6de7.... very close.
Takezo, are you preferring your 5v4g to the brimar 5r4gy with the 6fd7 tubes? From your earlier experiments, I had understood that you found the Brimar 5r4gy with 6ew7 output tubes to be the closest sounding combo to the 274B.

Thanks again.
post #267 of 508
Quote:
Originally Posted by musicmind View Post
Takezo, are you preferring your 5v4g to the brimar 5r4gy with the 6fd7 tubes? From your earlier experiments, I had understood that you found the Brimar 5r4gy with 6ew7 output tubes to be the closest sounding combo to the 274B.

Thanks again.
hey, A. the newer output tubes are making all of the rectifiers sound more
open and transparent than ever. i still prefer the brimar 5r4gy but you may
differ in opinion. with the new tubes the 5v4g sounds almost on par with
the sophia w/ 6de7, minus air at top and some micro detail... the 5r4gy brimar
is in the same league as the 274b w/ 6de7 in the soundstage dept... almost
on par in the micro detail but still behind in the bass/sub-bass region.

almost forgot; the 274b with the new output tubes are a revelation in the
micro detail dept... amazing. it's as if the extra gain is allowing the true colors
of the 274b to shine...separation of notes is the best i've encountered yet.
i'd imagine electrostatic rigs will sound something like this...but possibly better.
i think i'll have to look into an electrostatic set-up sometime next year...

also the headphone and source will factor into what you get out of these
combinations i'm certain. get your solder irons in gear cause the pdps will
really allow you to get the best out of the wa6.
post #268 of 508
Thanks again takezo, great info as always.

Any particular 6fd7 brand you think is the "best" ?

I have a 1951 Sylvania 5v4ga I got a few weeks ago. Like Orcin said, it has some nice subtle but noticeable tube lushness. It isn't as aggressive or thick in the bass as the 5r4gya, and I paired it with the D5000 for a few listening sessions.
I'm not sure if you have tried a 5v4ga and if it is the same sound as the 5v4g?

The 1950's Raytheon 5u4g is still the most resolving and balanced sounding tube I've tried without breaking the bank. Will be picking up my thin bottle RCA 6ew7 tomorrow, quite keen to give them a try.

Thanks again, happy listening.
post #269 of 508
I am currently using a pair of RCA thin bottle 6ew7 with my Sophia and I prefer the sound to the fat bottle GE 6ew7. The bass seems a bit better defined and the soundstage seems a bit more expansive to my old ears.
post #270 of 508
i've only tried rca and sylvania brands of the 6fd7. not much difference except
the fatbottle of the rca seems to have a slightly sweeter tone than the slim
bottle version. (10+ hrs. of burn-in is recommended for best sound.)

the 5v4ga is thicker sounding to me compared to the 5v4g. the latter sounds
a bit more transparent and a bit more open at the top. great for senn cans
but slightly unfocused with gs1000 and d5000. it could just be that the 5v4g is
much more burnt-in than the 5v4ga that i have... both were "NOS" when i
purchased but i've no way of verifying this.

the 5r4ga is similar as above, in that it too sounds "thicker" in the mid to
sub-bass region and less transparent than the 5r4gy, especially the brimar
version.

there's nothing bad about 5u4g... i just find most of the usa brands to sound
uncontrolled at the bottom. the roundbase english versions seems to sound
more controlled though, but much more expensive... may not be worth it
especially if you like the common 5u4g sound signature.

again, this is with units that have john's pdps modification... i forget how the
stock wa6 sounded...
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