I has the same issue with a NOS 5U4G. Humming like crazy. Tried another and the hum disappeared. Simon

Yes I had the premium parts - I figured as I was getting it shipped to the UK I may as well go for broke. I didn't get the stepped attenuator though. I spoke to Drew at Moon Audio and we discussed the best cable to give the GS1000 a more balanced sound and he suggested the Black Dragon. On...

WooAudio WA6 SE. I'm using that with my GS1000 and they sound terrific. My GS1000s have the Black Dragon cable, but the WA6 is a superb amp and drives the GS1000s very well indeed.

Quote: Originally Posted by rated1975 Covenants 6fd7 fat bottles arrived yesterday and i promptly rolled them into the WA6, in combination with the Sophia 274b. Major and immediate differences between 6fd7 and 6ew7 are increased gain, (now listening around 11-12 o’clock, compared with...

Quote: Originally Posted by RayfromTX Thanks a lot. How about a Woo WA6 upgraded with the PDPS power supply and the Sophia tube. If I go that route, then I will want a DAC to mate with this setup. Any suggestions there? My budget is going up I guess. I use my GS1000s (with Black...

Quote: Originally Posted by Covenant It only seems to happen with 6FD7 tubes, and this has been with both the Sophia and the EML. 6EW7s and 6DE7s work fine. Tbh the cracking noise is too loud and sudden to really identify which channel its coming from. I had a crackling sound...

Quote: Originally Posted by majkel I haven't tried the SAA cables, so cannot judge but comparing the stock GS1000 to the Black Dragon recabled pair several times showed that the stock cable is better. Black Dragon removes some nuances from music giving impression of better clarity. So...

Quote: Originally Posted by Covenant Just got my new Sylvania big bottle 6FD7's How long do drive tubes - or 6FD7's specifically - take to burn in? Edit: Okay What. BOTH pairs of 6FD7's I just got seem to cause nasty cracking noises through my headphones. Like very sudden, very loud...

Quote: Originally Posted by HeadphoneAddict Nobody here cares about the new WA22 balanced amp I posted about? The prototype is taking away the fun I used to have with my WA6 - I hate to send it back in a week, except that I'll still have the ZDT which is also exceptional. I...

Quote: Originally Posted by indydieselnut The one thing I noticed with the fat-bottle Sylvania 6FD7 is that they appear to produce more gain in my WA6SE. Admittedly, I listen at pretty low levels but the 6FD7 wouldn't let me get past 8 o'clock on the dial with my GS1Ki 'phones. I put...

Quote: Originally Posted by HeadphoneAddict IF the WA6 is maxed, has the pseudo dual power supply mod, and the Sophia Princess 274b rectifier then yes, the difference are very small small, regardless of whether using Grado HP-1000/RS-1 or HD600. The Zana Deux only clearly beat the WA6...

Quote: Originally Posted by BobMajor I'm driving my HD800s with an Eddie Currant Zana Deux and the source is an Empirical Audio Offramp Turbo 2 (USB to S/PDIF convertor) to a Channel Islands Audio VDA-2 DAC. Nice. I nearly bought a ZD to comapre with my WA6 with the idea of...

Quote: Originally Posted by BobMajor I bought the GS1000 from Moon Audio with the Black Dragon cable attached and although I've loved these phones and didn't think the HD800 could improve on them I was pleasantly surprised. Sennheiser has created something truly wonderful if you have...

Quote: Originally Posted by BobMajor A lot of the choice depends on your listening preferences. I've enjoyed the GS1000 for a couple of years and now I'm enjoying the HD800. The GS1000 has a slightly more intimate presentation with slightly greater warmth. The HD800 is more...

Quote: Originally Posted by jc9394 Maybe, I tried my other tubes but never pass 11. 6fd7 tubes are indeed higher gain but with my Cyrus CD6 SE and GS1000s I never went past 9 o'clock with any driver tubes in the sockets. Simon