Pars

Of the headphones that I have listened to large scale symphonic on, the 501/601/701s get my vote for best sound and truest to the recording. As a caveat, there are many high-end headphones that I haven't heard.

sigma22 shit for a certain dynahi/FET project (board, HS's, output FETs; already had most of the other stuff). Didn't want to disturb my 15V sigma I use for IV board testing. Plus a couple of opamps to fix a mini3.

Go to Home Depot, Ace or whatever hardware store and buy a 3/8-16 and a 3/8-24 bolt for $0.05 apiece or whatever. Go home and try threading them in (gently). If I were to guess, it looks like fine pitch (-24) to me. Could be 5/16 also though.

Just went thru AA to see if I could find anything and ran across a thread that I had seen some other points/spikes and had commented that they looked similar to the ones I have other than material: https://myesound.com/Points_n_pads.html

If it is 3/8", there are two common thread pitches that I am aware of... -16 (UNC) and -24 (UNF) I would grab a bolt of each and tip the speaker over and try it.

I'd get spikes. I used to have a pair of Infinity Monitors ('70s, same vintage as ESS AMT-1s) and could not believe the improvement some conical TipToes did for them. In my current Von Schweikerts, I have a set of Soler points which were stainless steel cones that I had him do in 3/8-24 thread for my speakers. Unfortunately he doesn't seem to be around anymore (Esoler on Agon). At any rate, you need to determine the specific threading required before you do anything.

Happy Birthday!

Getting worse with burn-in? Ever post that on HF? One of the burn-in threads?

I didn't have any np0 so I used what I had. I only bought 2 of the Aries adapters and used them for the THS4031s... I figured the AD8599s would work OK on BrownDogs which I already had. I may still etch some adapters I laid out which have the caps right on the opamp pins, and a ground plane on board. I don't think I could do these the way Aries does with the pins below the surface though, so the opamp would have to be mounted transversely like the Browndogs.

Put things back together tonight after socketing the PCM63s and replacing the 12 stock 1n4003 rectifier diodes with 11DA10 shottkys. I bypassed the Pana FMs on the Aries adapters with 0.1uf X7R 1210 package SMT caps (soldering those across the cap leads sucked... snapped 3 of them bending leads after they were soldered, leaving me short for the AD8599s). Removed the sockets for the AD8599s and soldered them on the BrownDogs into the board with Pana FM 100uf right on the pins. Worked right off the bat. Took a look at the PSUs on the scope and remembered that the PCB has the ground plane split into multiple sections, which are tied together with the chassis. Once I put a few of the screws in, the noise spike I had been seeing (~50mV on +/- 15V supplies) was down to 12mV PP. My HP3468 was reading AC of 0.065 mV on both + and -. Listened to a CD (nothing critical) but it sounded good, though I had it up too loud. After the CD was done, I checked the AD8599s and they were cool (had been fairly hot before). Button it up tomorrow and it will be done for a bit. Discrete boards this winter, as well as clock. Will post a pic tomorrow.

My condolences to you and your family Mike.

Good to hear that things went well. Best wishes.

It was 54 and sunny here today, so I took the afternoon off and played golf, probably for the last time this year as temps are about to take a nosedive. Always makes for a good day

I hope the blessing ritual doesn't include peeing on them

ground

I tossed together a layout for an adapter board with all caps on it, which would mount from the bottom: ths4031_adapt.pdf

Work doesn't like you trying to access porn sites?

Happy Birthday!

Ouch! Was getting christmas decorations ready and found half the lights in our lighted garland were working. Went thru all the bulbs and still not working. Went out with the wife last night and didn't find anything else we liked, so spent about an hour this morning with the DMM and fixed it. Now my thumb and forefinger are sore from pulling #&@%! bulbs.

What C0G SMT caps do you (or anyone) use? At 0.1uf, the ones I have seen mostly run $5-$7 each, other than the Murata 81-GRM31C5C1E104JA01 at Mouser, which are reasonable. I had been restricting my searches to 1210 package; these are 1206 package which is why I had missed them before. These are 25V which should be sufficient. I pulled and socketed the PCM63s yesterday and also pulled the sockets for the AD8599s and will put these right in the board instead. I think I may have a way of doing the SMT caps right on the pins, so will probably try this. I do have some 0.1uf X7R 1210 package caps, so I may use these. For PSU bypass use, is the C0G versus X7R that big of deal?

Happy Birthday!

Doesn't appear he lasted too long unbanned. Too bad

Happy Birthday Bryan! Is this 21? Have a great one.

Got both channels stable using the THS4031s on adapters directly into the PCB. I wound up putting the AD8599s for the buffer/SE->bal conversion on a pair of BrownDog adapters I had, and I used sockets for these. 100uf on each V pin to ground, 2.2nf MKP right under the socket between V+/V-. I did some listening and liked what I heard so far. CD player is still torn apart for some additional stuff I am going to do. The AD8599s seem to be running rather warm, verging on hot; I can put my finger on them but it gets uncomfortable. I didn't notice any oscillation, but I will look again. I may need to pull the sockets and put these right on the PCB as well. I don't think I can fit any COG ceramics bypassing the 100uf Pana FMs.

Happy Birthday!