The Stax thread - Page 47  

Did you just get those Duggeh? Sweet! Impressions my man impressions!

Hi Pete,

For what it's worth, I'd like to hear some comparisons between the 707tII and the 717 as well. I have been trying for several days on another thread http://www6.head-fi.org/forums/showt...02#post2421802 but have received mostly answers about other amps.

So far, the most that I can figure is as follows:

717- good accuracy, better base, possible slight brightness. Better because O2s like power. Less warm and more "analytical". It also seems clear that to attach two inputs, one RCA and one XLR, one must use a selector switch on the back.

707tii- Darker bass with perhaps a slight hump. Warmer mids. May benefit from tube rolling, but will not be a simple process. There are 3 inputs, 1 XLR and 2 RCAs which can be selected on the front (clearly a plus).

Please don't take my information as accurate. This is just what I have put together by reading posts. Perhaps someone on this thread could correct my mistakes. Perhaps we could also get more opinions about the difference between these two amps, and only these two amps. Or, if someone thinks they both stink, just say so and don't tell me about the ES-1.

In my case, I am leaning to the 717 but would welcome any advice.

chearfully withdrawn incorrect correction.

Sorry Duggeh,

You are quite right. I wrote "707tii" instead of "707tII". Thanks for the catch.

Hi Ruppin

Thankyou for the information on the 2 energizers.

Think I'm leaning towards the 707. I'm a tube person at heart

Just out of curiousity, are you talking about the SRM-007tII? It's the current top Stax tube amp. The 707 is an airplane, IIRC...

Note: There are two inputs on the SRM-007t. One is switchable between XLR and RCA, but they cannot be connected simultaneously. The other input is RCA only, and has an RCA passthrough, which can be useful (but will not pass a signal from the other input).

The 007t is a nice amp, but I haven't heard the 717 enough to compare.

Oops!!

Yep, talking about the SRM-007tII. Not a 707

okay, so the Lambda Sigs are pretty freakin' awesome. from memory, I prefer them the mighty SR-007. though they're not the uber detailed monsters I was expecting them to be. perhaps this is due to my low bias transformer box? I dunno. Either way, I love 'em, I'm keepin' em, and I'll certainly be trying harder than ever to get my hands on a pro box for comparison. The funny thing is, if it IS the case that the low bias is costing me detail/treble, I may like it BETTER this way. Anyway, I have a review/impressions thread up, so if anyone's interested in a more in-depth explanation, see that thread. I covered a good bit of ground, and may add more later.

When I plug my Lamda Pros into the normal bias jack on my amp they definitley become a bit softer, rounder and less detailed. You need to get some high bias love to those Lambdas. I doubt you'll like the normal bias better although I can understand why you might think so. You'll gain some of the detail you think they're lacking while keeping the smoothness. As the guy who sold me my set said, "Smooth with balls".

You've just confirmed my suspicions. However, remember that the Pros and the Sigs are two different headphones with two different drivers.

I'm still investigating modding the transformer boxes but an early test on my SRD-7 has proved successful. Adding an extra voltage doubler has got me up to about 320V and this only required an extra diode and a capacitor as well as the replacement of another capacitor. From this point things are a bit too tight to fit more parts so I think it needs a mini expansion PCB.

Excellent work. Keep us posted on developments.

What are you using to measure the bias voltage?

http://www.stax.co.jp/OLD/Photo/SRD-1_1.jpg

Does this mean what I think it does: that you could use the SRD-1 to generate bias voltage all the way up to 500V?