WOO Audio 3+ experience

[ManAtWork]

Quote:

Originally Posted by Skylab /img/forum/go_quote.gif Beyond that I'd look for Amperex Bugle Boys, but be prepared to spend much more money for those.

See this...but very expensive. http://www.audio.idv.tw/shop/product...roducts_id=721

Another cheaper option here. http://www.audio.idv.tw/shop/product...roducts_id=736

 

[MooBin]

RIGHT HERE - quad, too!

Thanks for your proposal ! I saw this one already on Ebay before - but I cannot decide if its any good - the values presented do mean nothing to me. I need a matched pair and preferable NOS - which this quartet is not. I do not have a tube tester, too to decide which pair is the most suitable. OK, I have ears

But thanks anyway ! I will now first wait for two Sylvania 6DJ8 as Skylab suggested and I do get some ECC88 Philips Holland NOS 1975. Both lots should arrive next week. I will post the results.

 

[MooBin]

Quote:

Originally Posted by ManAtWork /img/forum/go_quote.gif See this...but very expensive. http://www.audio.idv.tw/shop/product...roducts_id=721 Another cheaper option here. http://www.audio.idv.tw/shop/product...roducts_id=736

Thank you very much for your proposal and good intention !

I have to admit that my chinese is really bad (if not to say non existent

).

NT$ is taiwanese dollars, 5000 of those would be appr. 150US$. This is not too much I believe -. depends what you get for it - but I cannot judge from the text what I really would buy. Besides, as stated before two new pairs of driver tubes are coming next week, I decided to test those first.

But I thank you again for this recommendation. An alternative source for tubes, too (well the chinese language....)

 

[MooBin]

[size=medium]Reporting day 4: Optimizing the power situation further and trying new GAS7GA[/size]

Burn in time so far: approx. 38 hours (about 67h for the Senns)

The new 6AS7GA did arrive (1960 NOS) and I swapped the 7236 with a new 6AS7GA. Although this tube is very most probably from a different production lot as the original supplied with the amp, the hum previously noted was immediately back (see reporting day 1 & 2).

This leads me to think that this type of tube is generally producing a faint hum with the WA3+, at least with the one I have. However, I would have to say that the hum is faint and is not disturbing as soon as the music sets in. But in pauses the hum may be noticed.

Putting the Cetron 7236 back the hum immediately vanishes. And checking its musical performance again in comparison, I have to conclude that the 7236 Cetron is superior, too. So the 7236 stays in place. And on top, the 7236 emits a much more beautiful strong tube glow. The tube is higher than the 6AS7GA, too. Not only better sounding - looking better too.

So based on my limited experience I would now dare to recommend to exchange the stock GAS7GA with a 7236 tube in a WA3+.

I manufactured a new power cord for my source then. Since it has only two poles, swapping the power phase from one side to the other is easy, too - just by twisting the connector on the wall outlet. I noticed that one position is superior to the other and it stays now that way.

Next week, new driver tubes will arrive and then the experimentation will go on. Of course I'll let you know about the results.

I would like to thank all the members of this really interesting and enjoyable forum.

 

[ManAtWork]

Quote:

Originally Posted by MooBin /img/forum/go_quote.gif Thank you very much for your proposal and good intention ! I have to admit that my chinese is really bad (if not to say non existent ). NT$ is taiwanese dollars, 5000 of those would be appr. 150US$. This is not too much I believe -. depends what you get for it - but I cannot judge from the text what I really would buy. Besides, as stated before two new pairs of driver tubes are coming next week, I decided to test those first. But I thank you again for this recommendation. An alternative source for tubes, too (well the chinese language....)

There is a UK flag icon at the upper right corner so you can switch to English page. Sorry for the inconvenience.

 

[MooBin]

Quote:

Originally Posted by ManAtWork /img/forum/go_quote.gif There is a UK flag icon at the upper right corner so you can switch to English page. Sorry for the inconvenience.

Many thanks ManAtWork !

Yes - the flag is tiny but it is there - sorry for that I really did not notice that before. I think its an interesting offer, although the appr. 160 US$ is per piece ! Too much for me at the moment

 

[Rob T]

 

[atbglenn]

Is it a trick question?

 

[MooBin]

Which Item looks slightly out of place? 1, 2, 3 or 4 ?

Very well spotted ! Indeed there is an item which does not fit the scene. As you may have already noticed, it is of course [size=x-small]item 3[/size]

The source does not live up to the standards of the amp.

If you only knew what MooBin - or better "moo bin" means. That should explain the other context further. Look at the avatar, too.

 

[Skylab]

It would be interesting to see if you used a "normal" ST/coke bottle shaped 6AS7G like the RCAs if you would still get this hum. The 7236 is actually a different tube from the 6AS7, even though it works fine in most 6AS7 amps. So I wonder if a 6AS7G would hum the way the GA's seem to. I never tried a GA in my Woo3 when I had it - but none of the 6AS7G's I used ever hummed.

 

[MooBin]

Quote:

Originally Posted by Skylab /img/forum/go_quote.gif It would be interesting to see if you used a "normal" ST/coke bottle shaped 6AS7G like the RCAs if you would still get this hum. The 7236 is actually a different tube from the 6AS7, even though it works fine in most 6AS7 amps. So I wonder if a 6AS7G would hum the way the GA's seem to. I never tried a GA in my Woo3 when I had it - but none of the 6AS7G's I used ever hummed.

Skylab, I'll try when I have the chance. Now I have 3 different tubes (all 6AS7G) of where 2 make the WA3+ hum exactly in the same fashion. I did not try the last one, though.

By the way while we are at it: If your had three pairs of 6DJ8 on offer which tested as follows - which one would you prefer ?

Pair A) 112/115 , 114/116
Pair B) 110/110 , 108/110
Pair C) 109/109 , 105/107

I do not even know what these numbers mean but they most probably make some sense to someone knowledgeable about the subject like you.

 

[Rob T]

Quote:

Originally Posted by Rob T /img/forum/go_quote.gif Which Item looks slightly out of place? 1, 2, 3 or 4 ? Very well spotted ! Indeed there is an item which does not fit the scene. As you may have already noticed, it is of course [size=x-small]item 3[/size] The source does not live up to the standards of the amp. If you only knew what MooBin - or better "moo bin" means. That should explain the other context further. Look at the avatar, too.

Ok, so what does "moo bin" mean?

 

[MooBin]

Quote:

Originally Posted by MooBin /img/forum/go_quote.gif Ok, so what does "moo bin" mean?

Finding out is all the fun. A hint, though: My Thai wife and me are collecting pig figures - they are all over the place (as you can see).

 

[Skylab]

Quote:

Originally Posted by MooBin /img/forum/go_quote.gif By the way while we are at it: If your had three pairs of 6DJ8 on offer which tested as follows - which one would you prefer ? Pair A) 112/115 , 114/116 Pair B) 110/110 , 108/110 Pair C) 109/109 , 105/107 I do not even know what these numbers mean but they most probably make some sense to someone knowledgeable about the subject like you.

Without knowing what tester those results are from, and understanding 1. what sort of test that is (emissions? actual transconductance?), 2. what the range is and 3. what the target spec is for a new 6DJ8, there is very little that can be gleamed from those results, other than all of the tubes seem to have fairly closely matched triode sections (again somewhat dependent on what the scale is).

I would go for Pair B, given that the tubes overall have the tightest match.

 

[RyanJH]

A question for anyone (including OP) who has purchased a WA3+ in the last ~6 months.

How long did it take to get to you? I was told 4 weeks, I start the 5th week on the 9th... so the estimation isn't late yet... just trying to get an idea of what I can really expect as far as wait time (and I don't want to bother them with e-mails until they really are late).

I ordered the WA3+ after waiting ~2 weeks for a little dot MK3 only to be told that he was out of stock (and the Chinese spring festival also delayed things). So I am up to a total wait time of ~7 weeks without an amp for my new DT880s. It's getting painful!