Torpedo

U2 - No line on the horizon For starters badly compressed dynamically. About the music.... don't know yet. At track 4 so far.

Very Happy Birthday Nate, I wish you all the best

Very nice work, congratulations. If this sounds half as good as it looks...

Short might happen? Vibration? In my ignorance of technical matters and considering case heat sinking was an option, I thought it could be a good thing Would you please would be so kind to explain why to me

Not sure, but that could be an advantage. You can use some thermal conductive material to make the heat sinks contact the top cover, so it would become part of the heat sinking.

The Spanish gang has some suggestions which maybe you'd be interested in discussing: - Making separate enclosures for the PS and the signal parts. This has the advantage, being S22 power supplies, that the PS alone could be used in the future to feed a B22, even a 6 boards unit. It also could save costs for the PS trannies. Noise, RFI shielding, and vibration damping is a bit less of a matter, and would allow using quite safely less expensive trafos like the Talemas which Picaudio and Hitori suggested. - We've thought that it'd be a very interesting feature that the unit had two separate 2ch volume controls, so when using the unit in balanced mode each pot would control a single stereo channel, but when using the amp in SE mode, provided we put two TRS outputs for phones, then each pot could control separately each SE output. Hence it'd be like having 3 separate amps, one balanced with separate volume controls for each channel (like my Gilmore balanced Ref), and two SE with independent volume controls for each amp. This can be easily implemented if using stepped attenuators (for channel balance when used in balanced mode), but we don't know how it could be implemented if using the SMD attenuators and the digital controller J4cbo is developing. Would it be feasible using the board?

OK then, Carlos is in for 4 Dynafet boards with transistors, heat sinks, etc. and 2 Sigma 22 kits with Muse caps, big heat sinks and I guess blue leds too. Otherwise he'd better show up and change the color hahaha

Don't know about US fees, but here placing a transfer to USA in dollars and with no additional expenses for the receiver isn't much more of 2% with a minimum fee of 6 euros or so. Is Carlos in for 2 or for 4 main boards? He wanted 4 but I don't know if all them were available.

Cool. If a mod reads this, please give Carlosgp Casino access so he can follow the thread and know about payments and everything. I think for us it'd be better making a single payment by bank transfer, of course all due expenses on our side. This would take less banking fees than ordering four separate transfers and much less than Paypal fees. Sending a check from Spain would be very impractical indeed. However we'll do whatever suits Luvdunhill best. So it's $60/board including Paypal fees but shipping should be added, OK? If we pay by bank transfer I suppose we can subtract 4% since no fees should be charged on his side.

That would be great. If Luvdunhill can transfer the cancelled order to Carlos, then he'd be in for 2 additional S22 kits, I suppose with the upgraded Muse caps and big heat sinks too. If he's in, then having carlosgp with Casino access would be good too. You'll receive the PM with Rodrigo's address as soon as I finish this.

Would it be possible to add another member to the group build this late? A friend of the Spanish team, also a Headcase member (carlosgp) but as Hitori and Picaudio not very participative, knows about the build and is very interested. He would be in for 4 Dynafet boards with needed transistors and heat sinks, and 2 S22 power supply kits. I don't know if he would build it himself or would get Picaudio to build his too. I think the big heatsinks, Muse caps, and blue leds are OK for me too. Regarding the address, the kits and boards should go to 15007 A Coru

Spanish team is in for 2 S22 kits each, so 6 kits in total. They can be sent to Picaudio since he's building my unit, and he'd send the 2 remaining kits to Hitori. Not sure about the heat sinks, I think having to design the box to provide dissipation for two PS boards can add some complication. Aren't there any on board sinks which could work? OTOH my B22 is using a single S22 to feed 3 signal boards, uses on board heat sinks and not a single problem so far, not myself nor any previous owner that I know. In fact I don't think it even gets worryingly hot. Would driving 2 Dynafet boards be that much more stressing for the S22 than driving 3 B22 boards?

Very nice, did you DIY or got it from anywhere? I think I might try one of those on some records.

Omnivorous. Widening horizons as far as I read about performers I didn't know, or hear something appealing. If into anything reminiscing of a phase, perhaps I'm into a female singers one which includes even opera, but this is lasting several years, so probably more than a phase it's a personal bias.

IMO it'd be great having lower gain or a selectable one. For most cans, considering a 2-3V output source, 11x is too high, even 8x is very much considering my experience with the Beta22. Any idea what would be the lowest gain the circuit can take without becoming unstable?

Sorry for you Rodrigo

I can't speak for Hitori nor Rodrigo, but I think that getting the S22 boards and parts at $67 is a good deal, and if the kits come assembled it will save Rodrigo some additional work. For me it's fine. If they agree they'll say soon. IMHO it'd be good the kits came with the onboard heat sinks, the ones required to dissipate the power two Dynafet boards ask from one S22. I suppose that'd be the same for everyone. In the same way I guess we all be using 30V output trannies. Icarium, thanks for updating the spread sheet with the transistors needed.

Let's see if using the code trick it displays as typed: RbL At= -------------------------- ( RbL

OK then, but please add the transistors to populate the 12 Dynafet boards and also the 6 Sigma boards with their parts for the Spanish gang. I think that getting the S22 boards in kit form if it's flexible enough to let you choose your trannies can be a good thing. At 67$ doesn't sound very expensive.

We also would like 2 Sigma boards each, the transistors for the Dynafet and the parts to populate the S22, unless Picaudio states otherwise.

I've checked it. Did Hitori contact you and said he wanted 6 boards instead of 4? Maybe he wants some spares hahahaha.

Happy Bday, enjoy a lot

You said that covering the TV screen changes sound. Does the soundstage going to the right improve and get more centered when you do so? If stage shifts to center when covering the screen, but it's not dead center with a mono recording, then try using thicker cloth to cover the screen, it might work perfectly for "serious listening". Other cause for that could be the low frequency sounds having more room and some reverb when getting into the next room through the door. Maybe adding a very thick curtain to "close the door" is of some help.

I won't make things more complicated for Picaudio building my Dynafet, however the trannies can become handy when using a SE source to drive balanced headphones.

Are you planning to use the Sowters for the PS and the balanced to SE conversion or just for the second? I can't say myself, I need Picaudio or Hitori to show up. On the other hand it depends on the savings and what Sowter says about sending some trannies to Spain directly, maybe it doesn't make it any more expensive for you, so it saves us the risk of paying custom duties for an European product and the sure cost of shipping from US. Trannies are heavy