Pars

Happy Birthday Colin!

Rush Limbaugh... I'm trying to be nice, so I won't say anymore.

Happy Birthday Steve! I hope you're feeling better so you can enjoy it.

Happy Birthday Ed! I still wear the CJ Chicago T-shirt you designed!

Happy Birthday!

Thanks for the info! Yes, I hadn't considered the Cardas jacks, but might. I haven't done any more work on this yet. I need to order the switch to see what effect that has on the spacing. Edit: Hmmm, I thought I had Vampire's website, but as you mention, I can't find it now. I wonder if something is up with them (as in gone under). Could be a good reason not to use them, although for my application, it is somewhat a one-off. I might want to reuse in the future however, so possibly looking at the Cardas might be wise. I presume it is the GRFA PS2 that you were referring to?

Yeah, that reminds me of when my wife and I lived in Dallas. The first year we were there, there was a bad ice storm. I was going to go to work, so went out, got in the car, and backed out of my parking spot in our apartment complex. This was on a hill, and I was perpendicular to the hill. Car slid sideways down the hill, couldn't get back up it, so called in to work. Later, on the news, I heard something about someone killed while riding a motorcycle (among other traffic accidents). There was an overpass from the I35 to I635 freeway that my wife was always scared to death of, which reminded me of this: https://www.wkrg.com/biker-dad/video-pickup-flies-off-icy-overpass-in-wisconsin/

Reminds me of a forum full of nwavguy... it surprises me that they haven't just declared the O2 all the amp you'll ever need and be done with it, though maybe his new AP tests to a lower distortion level than what nwavguy had at the time.

RIP Chick.

Agreed. I ventured over to ASR the other day, and happened upon a thread that Amir was measuring a couple of Stax amps. Kevin wandered by and explained to him why his standard 100K load wasn't going to cut it here. After much handwaving, Amir declared that he shouldn't have to read (and understand) an amp schematic in order to properly measure one. Somehow he managed to not blow up his AP or whatever it is he is using to do his measurements. Thread closed. D-bag indeed!

Are Mouser or IXYS going to do anything about it, or have they been told?

Happy Birthday Jeff!!

Barrier strips: For the carbon I'm building, I have 4 pairs of primary wires (2 transformers). I was thinking about using some barrier strip(s) to combine the primary wiring to the IEC (for the time being). Any particular ones any of you use and like for this type of application? Covered might be nice as well, since it will have live AC on it. I was looking at some at Mouser, but there is considerable choice, so thought I'd ask.

^ Agreed... great actor RIP Christopher Plummer

OK. Actually, I had looked at them but was having trouble discerning which OV cat was most applicable since they all looked to be more building power related. – Overvoltage categoriesThe standard has divided the possible overvoltages into four categories. The three categories which relate to connectors are shortly described below: Overvoltage category I Equipment (e.g. connectors) intended for the use in applications or parts of installations in which no overvoltage can occur.Examples are low voltage equipments. Overvoltage category II Equipment (e.g. connectors) intended for the use in installations or parts of it, in which lightning overvoltages do not need to be considered, however switching overvoltages generated by the equipment. Examples are household appliances. Overvoltage category III Equipment (e.g. connectors) intended for the use in installations or parts of it in which lightning overvoltages do not need to be considered, however switching overvoltages generated by the equipment, and for cases where the reliability and the availability of the equipment (e.g. connectors) or its dependent circuits are subject to special requirements. Examples are protecting means, switches and sockets. From this, it would seem that category II is the most applicable. Pollution degrees of 1 or 2 would also be applicable since the amp shouldn't have any condensation present, even briefly (degree 2) so no conductive pollution should be expected (briefly is allowed for degree 2). So the ii/2 spec would be applicable, but for safety, the iii/2 rating would be what I would look at.

Thanks. Not quite sure how to apply that here though, as the datasheets are inconsistent. I suppose the 651-1729047 should be OK, though Mouser calls these a 250V part. The 651-1800090 is shown as a 400V part. I need to order the CPC1117N and resistors for the soft start anyway (universal PSU; not for the Carbon), so I guess I'll get the 651-1800090 and use them.

It is the Hirose series which will fit, and are 500Vac rated (https://www.hirose.com/en/product/p/CL0676-0019-7-35). Just to note, the Phoenix connectors shown on the BOM I had, as well as many of the BOMs in this thread (651-1729047) are only rated for 250V (data sheet claims 400V)? I haven't looked into the III/2 and II/2 spec to see what that means. I thinking of replacing with these, which are 400V: 651-1800090, though it uses the same III/2 rating. These do say 400V nominal however. I am using Kapton tape under these, and would guess that many have built theirs using the 651-1729047 parts?

I don't have any spare boards left, and I thought I had posted the gerbers in this thread, but I guess I hadn't. Here are the gerber files for the 2-pot (CP601/CP2500) and 3-pot (CP601/CP2500/Alps RK27) boards. Some place such as seeedstudio.com can run these for pretty cheap. Just give them the entire .zip file. TKD 4CP 2 pot final.zip TKD 4CP 3 pot final.zip

The pot you currently have in the amp is an Alpha (or Sung Huei) RK2142G (datasheet attached). The 4th pin is a loudness tap. So basically, transfer the existing wires straight across to the TKD replacement. Watch the heat on this; try to make good mechanical connections and don't linger with the soldering iron. Looking at your first pic (the TKD), the pins in order from left to right would be ground, wiper, and input, or 1, 2 and 3 corresponding to the attached RK2142G datasheet. The Alpha pots aren't bad at all, particularly for the price, but not in the same class as the TKD. BTW, where did you obtain the TKD from? RK2142G.pdf

Agreed Al. I hadn't realized that Cicely (or Cloris) were that old. RIP to both of them.

Anyone have any idea what this damping material is? It is what was used by GNSC for their mods to my Resolution Audio Opus 21. It kinda looks like dynamat and is 3.4mm thick but doesn't feel like dynamat (or smell asphalt like). Is it Paxmate?

So did Catherine Wheel...

RIP Hank...

The DPS or required PSU pinout would match the Elpac wallwart these used to come with. V1 is V+, V2 is V-. From the datasheet:

Happy Birthday Mike!