First foray into tube rolling WA7 here (page1 post7, coincidentally!)
more tubes and cans to come, so i guess ill just keep editing that post and adding there.
"here" being where? Pg1 post 7 in this thread being by HolyCheese...
Also, as far as tube-rolling goes, the WA7 is really not an interesting choice since it only takes one specific type of tube, the 6C45, and there are really only the easily available Sovtek and the out-of-production Reflektor & Electro Harmonix, which are pretty much identical in specs & construction (besides the gold pins on the EH)
More importantly, If you plan on trying other "compatible" tubes (EC80x0, 437A etc.), with different specs, make sure to check with Woo beforehand since the WA7 may not be designed to adjust to them (unlike their other amps for which you can get a tube compatibility chart)
UPDATE: Nevermind, I think I found the thread post.
There you go, Sorry for forgetting to actually link it.
Yes its obviously not a 'tube rollers' amp, but there are still options. I dont agree that the gold pin currently produced valve will be identical to the NOS reflektor- where are you getting these specs? Is it the same rational that says the Reflektor is the same as Western Electrics 437? [Which by the way mght also work if you can afford them, as kindly stated above, best to check with Jack].
Again, we all know this isnt a tube rolling amp. We knew it as soon as we saw the "6c45" on the original advertising. i just thought, even with the limited choices, for my own curiosity it had to be done, and that it would be nice if someone explored them here.
Hope its helpful.
Edit: found here,
Although it seems they have never done a datasheet for any of these specifically. Not even the still in production EHX gold pin? Youd think they would if its still in production. Only one way to know, and ill know VERY soon!
No problem with that, just wanted to point out for potential non-hardcore buyers joining this thread that tube-rolling is not something they have to be much concerned about for this particular amp. I generally find that especially if a tube is of the same type/family, the audible difference are very minimal for normal listeners. I did not intend the above to come across as "authoritative", sorry for not being clearer. Just the best recommendation based on information available to me at this time regarding the 6C45 in particular, and my experience with quite a bit of tube-rolling on Woo amps in general.
Not sure about the Reflektor (and congrats on getting a pair!) but from the datasheet for the generic (Sovtek) 6C45, it seems it has 7.8W maximum plate dissipation & 150 Vdc maximum plate voltage. As far as the EH (G)old pins goes, the closest thing I've found is this sheet on 4tubes, and it lists the same specs (7.8W max plate dissipation & 150 Vdc max plate voltage) and available pics which lead me to believe they are (nearly) identical. Other tubes that may or may not be compatible pending Jack's recommendations, with different specs than the generic 6C45, can be found on the list in the middle of this general page.
Interestingly, I thought the EH Gold pins was no longer in production, though it is listed on their website... Why would they be so expensive and relatively hard to find?
Anyway, looking forward to finding out myself, hopefully in the near future! (my pre-order was early January, with a separate one for the EH tubes after Jack had pulled them off the official page for a while)
I have the LCD-3s plugged in most of the time. Getting a good handle on the sound has been interesting as I'm used to dead neutral. A quick summary would be warm with a very pleasant focus on the mid-range but at the expense of ultimate detail. The DAC may be contributing to this very slightly as I thought the sound was a touch leaner with another DAC as a source. I suspect I'd like the EH Gold Pin tubes better. Regardless, that mid-range focus makes jazz and vocals very pleasant.
I am running a WA7 HE500 combo, its only been a few hours and I will post an in depth report in a week or so.
For now I can say without doubt the match is really good, a little on the dark side of neutral which would be down to the sovtek tubes, plenty of power with strong bass and just a touch of that slightly euphoric mid range.
Not what I would call a "reference sound", it is quite unique in my experience the only word I can think of right now is beautiful.
I am loving the amp so far during my brief time with it (just got it 2 days ago).
But I have a couple of technical questions that hopefully someone has the answers to:
Is there a specific headphone impedance threshold where it would be recommended to use the Hi-Z setting vs. the Lo-Z setting?
I am using Hi-Z setting for my HD650 and T1. And Lo-Z for my IEMs. But what about the (80 ohm) DT1350?
What is this setting doing exactly? Is it just a gain setting?
Thanks for any insight.