Curious_George

These are Walnut, so the sound is kinda nutty (Earthly).

No, no, no… you have to have a power cable that is like those cables you trip over at the state fair.

.

.

.

The 2A3 is my favorite tube as well. It is more forgiving if you just want a basic "no bones" amp that sounds fantastic. You can run the 2A3 filaments on AC and hardly have any trace of hum, even on horn speakers, making the 2A3 circuit very simple. You can run the 300B on AC too, but even with a hum bucking pot, you will have more hum than a 2A3.

.

I have always protected my hearing due to extreme sensitivity to loud high frequency noise / sound as well. Even going to a loud bar or restaurant I will wear ear plugs because I will get a headache. Occassionally, I will get a strange look, but I don't care.

The capacitor & inductor values will be different for various crossover alignments (Butterworth, Linkwitz-Riley, Bessel, Chebeshev, etc). The most common is Butterworth, but Linkwitz-Riley has been popular for awhile now. Choice of alignment has many variables. Some orders only offer one alignment, for example a 1st order can only be Butterworth.

Probably, but it definately depends on the brand of transformer and winding technique. I have some Lundahls and I'm not too impressed with them. My favorite right now are a set of James JS6112HS's. My 16k 211 output's go out to 32KHz. Pretty good for that high of an impedance.

It is the output transformers in this case. These particular Edcors are the GXSE line, which are right below their “premium line”. Typically, you can get to -3dB @ 40kHz with the GXSE’s but I guess it depends on who winds them on a particular day. The CXSE’s are spec’d for more bandwidth but they are 25 Watt beasts and the core is huge. Great bass of course but I think the smaller GXSE line sounds better, especially if the ones you get have the higher bandwidth. My wife said this new amp sounds better than my 2A3 that goes out to 40kHz.

Perhaps I’ll try it when I feel a mood swing coming on. I guess everyone has an alter-ego, but some are always in the altered state.

What’s up with people changing their names? It’s like the “Three Faces of Eve”.

3K ~ 3.5K will give "maximum" power if that is a design goal. I prefer less distortion and extra drive signal is easy to come by if your design is good. In addition, if your transformer only has one secondary tap (lets say 6 Ohm), 3.5K seems to be a good compromise between 4 and 8 Ohm speakers. A 4 Ohm speaker will present a lower load than 3.5K and an 8 Ohm speaker will present a higher than 3.5K load.

.

There has to be an impedance curve from someone here on the forum of a K-48. In any event, we can get the K-48 rolled off some how to mate with the ZXPC horn. If you need help, let me know.

Exactly. ABS is fairly soft. The 18 x 10 horn is somewhat more “dense”, so I know it is not just ABS. I assume that the seller ZXPC doesn’t know what all his products are made out of and just listed ABS as a generic material. Everything plastic is “ABS”.

Thank you. I've been building stuff for a long time now. Visiting factories in Asia for 20 years also helped. You get a lot of ideas from manufacturing and talking to the engineers.

Ha ha. Ok, whatever it is made of, it is a thick durable horn. Somebody mentioned it resonating (unmounted), but I have not experienced that.

I still think there is something additional in there. Just because it is listed, doesn’t mean it’s accurate.

The 18 x 10 is made from ABS plus some other inert filler. It’s pretty thick, but I don’t think it is just ABS. It is too heavy and has a different resonance than just ABS.

.

I got shocked (on my one hand - palm to fore finger) by 1kVDC poking around. My other hand was in my pocket. It burned more than hurt and will definitely wake you up. I use a chicken stick now, no more fingers.

Depending on the output tube used, you can get betwen 6.5 ~ 8 Watts out.

.