I have finished the Torpedo build today. As said before I first measured the slightly mismatched 6J6 by looking at the output. Test setup was output switch set to high, 330 Ohm load resistance. As mentioned before, the DC voltage at C11/C12 was 128 V at the left, 144 V at the right channel...

  That was one pair of the kit indeed. Thanks for the offer but I plan to use the 6J6 only for initial setup and I'm going to switch to E90CC anyway, so the tubes are ok for me.     Thanks for the idea about AC matching. I will try to match the best pair of my 5-pack of E90CC this way. I...

I just finished assembling my Torpedo PCB. At first startup I have seen that the DC voltage at C11/C12 varies between 130 V at one channel and 145 V at the other channel. After exchanging the tubes the voltages followed with the tubes. Would this measurement be a good indicator for tube matching...

  I just picked up my kit from customs on Friday ... and have already the new PCB included.   So which SMD caps do you recommend?

Quote: Originally Posted by luvdunhill Also, 0.1-0.2mA is probably within the realm of error, even if you have the most accurate meter in the world. For example, if you pick the JFETs up with your fingers and place them in a test jig, you may notice slightly different readings then if...

I just matched the J-FETs for my sand build. Out of a batch of 60 I found 21 with an Idss > 10 mA and out of these I could gather three quads. So statistically the recommended 20 J-FETs for one quad should turn out, but I wouldn't be sure if always. My three quads have Idss values of...

My Boards arrived today. Great Work! Thanks Alex! Most of the parts are already here, but I won't have much time in the next weeks. I think I can start building in February, until then I should be able to get the remaining stuff.

Quote: Originally Posted by MrSlim Very Nice Job! Thanks. Quote: Originally Posted by MrSlim Where did you get the cool top grill? It's standard perforated aluminium sheet. Luckily I live in a bigger city here in Germany, so I have two professional aluminium...

After half a year lying naked on my bench waiting for an enclosure I finished my SOHA II today. Still to do is painting the top cover, what I will do in summer when I can spray outside (my wife will kill me if I try this in the kitchen, and rightly so ). And the potentiometer shaft has to be...

I'll also join in.

Quote: Originally Posted by BoilermakerFan Can I parallel (3) power LEDs per channel? I need (6) for back lighting on my chassis faceplate. I would suggest connecting the LEDs in series, not in parallel. With the voltage available you can easily drive 100 of them.

Quote: Originally Posted by runeight Well, as it turns out, splitting the panel will only add cost. At this point I will just get both amps and assume that they all will go out. Although I already have some tubes I would be in with a solid state amp in this case. Alex please add...

Quote: Originally Posted by runeight So the order is full. One day I didn't look into head-fi, now I'm already too late. So count me in for the third run, if there will be one. In the meantime I will keep on reading all your listening impressions and building experiences. Chris

Quote: Originally Posted by zkool448 Added above some pics of dry fit.. Really Beautiful. But I would be a bit concerned about ventilation. I finished my SOHA_II this week and still without any enclosure the heatsink temperature reaches 60 °C (with a few mA below the...

Alex, Thanks for your diagnosis. I checked the first plate of the tubes (Pin 1) and there are the expected 19 Volts. So it's really only that my tubes are mismatched. I have four of them so I will try the others and stick with the best ones. Seems I have "luck" with mismatched parts. The 7815...

Quote: Originally Posted by runeight Do you mean TPL and TPR measured with respect to ground? Or measured with respect to the B+? With respect to TB+L/R. Chris

I finished my SOHAII right now. Everything worked fine (besides I forgot to put the OP amps into the sockets before starting the setup) until the last step: Check TPL and TPR. One channel measures 13,8 V the other one 22,6 V, the measurements follows the tubes when swapping them. Since the tube...

Today I received the last parts to build my SOHA_II. The resistors and E12-diodes are already stuffed, the rest to follow soon. Now I have some schottky diodes at hand (MBR1100, 1 A 100V) and I think they could be a nice upgrade over the UF4004 for the +/- 15 V supply (D1P-D4P). Anyone...

Quote: Originally Posted by geardoc The ANC7 is a bit muddy sounding without the noise cancellation. But, turning the NC on increases the sound-stage/instrument separation and adds a considerable amount of "air" or something like that. The midrange and highs pop out when you turn the NC...

Quote: Originally Posted by cl516@nyu.edu Ok so I'll be on a plane, long ride to Asia. [...] Is it a waste to bring my HD-650's? ATH-ANC7 does here a good job for me. With these headphones it was the first time I could hear music during a flight. With all other headhones I gave...