JohnA

$1000 or less is a fair price or better. Nothing needs to be done, or changed due to age itself. 1977 should have an R as the 3rd or 4th character in the serial number. They will have K-55-V squawkers and K-77 (AlNiCo, round magnet) tweeters and K-33-E woofers. The crossovers should be Type AA. At that age, the cabinet will typically have small delaminations and chips in the edges of the plys. They will sound GREAT.

The big caps in the woofer circuit are apparently to cause a "ripple" of some sort in the response curve so that the overall response of the system is flatter, too. You asked about air and iron core inductors. Iron core inductors have less resistance for their inductance, but the iron core will "saturate" and the inductance will change if too much power is applied. Sometimes the saturation power can be surprisingly low. Air-core inductors don't saturate, but have more resistance, or are larger than an equal Iron-core inductor.

I like the Kit/Plans idea. I have a pair of 902/511Bs that woulld be just perfect on top of a Jubilee bass horn.

How do you find that stuff on ebay? I check it every few days and I've never seen a Rebel.

AK-3 schematic; not much difference. I believe the tweeter protection MAY have been left out of these drawings.

AK-2 schematic. Type AK-22.pdf

I have not hear either the AK-2 or AK-3, so I cannot tell you if it is a noticable change or not. The people I know change their diaphragms after they fail. That's an easy decision. Sometimes you can hear the voice coil rubbing before it fails. That is another sign it needs replacement. If you have K-77s with the original diaphragms, they are rated at 2 continuous watts and 20 peak watts. The K-77-Ms are rated at 5 watts continuous and 50 peak watts. All replacement diaphragms now have ribbon leads to the voice coils and the 5/50 watt rating. I don't believe replacing the diaphragms will increase output. If you have the AlNiCo K-77, it may have lost some magnet strength. AlNiCo can be remagnetized to full strength by a special machine. I only know of one such machine in the U.S., though. On another topic, can you translate "testastretta"? It is a term Ducati uses describing their engines.

I've heard of the 1RB and seen pictures. It doesn't seem common. It was used beyween the K-500-5000 and Type A. I would have thought a '65 model would have had Type A.

I don't see no Bad English! There is probably not much you can do to increase the tweeter output over the AK-2. High quality capacitors like Solen or Hovland will reduce losses so that the maximum signal gets through the filter and may help by a fraction of a dB. However, the premium caps will improve clarity more than anything else. The ALK crossovers will do the same thing; I have a set. Mine were built by Al and were not home-made from low quality parts. Perhaps your room has too much soft furniture and drapes (curtains). Those things absorb high frequencies a lot.

I recognized some of the parts, but couldn't remember what bike they went with. Both look great!

Flason, Great job on the K-horns! You should really enjoy them. Now, tell me about the bikes.

OR, you could use Mozilla (free) and never get a pop-up, worm, or adware. It has no mechanism that allows worms or adware and it's pop-up blocker is nearly perfect. I hate to borrow someone's PC and be forced to wade through the pop-ups in IESux!

Y'all post pictures. I have an interest in picking up a single Shorthorn to try to make an old-fashioned mono system.

Nancy. Tall and Blonde.

The problem is the compressed mp3 format. I want to go the other way with 24/192 DVD audio. "More Data, Mr. Scott!" More sampling, less smoothing, make it sound like vinyl, but with no pops and direct access to any song or any playback order.

Yes, one set of xovers I use in my La Scalas have had all of the caps replaced with Hovlands. I have an air-core inductor for the woofer but have been too lazy to install it. The comment about the inaudible difference when changing the squawker cap comes from the La Scalas; inaudible to me, at least. The Heresy crossovers are like the ones in the pics, with modern caps and inductors.

I think you might hear a difference (a good difference) by changing the tweeter cap. I really did not notice a difference between the motor-start cap and Hovland on the squawker circuit. Modern design is to have all 3 circuits parallel rather than feeding the tweeter from the squawker cap.

The screws that ho;d components don't hold anything else. There are 4 screws that are behind stuff that hold the board to the cabinet.

I put Hovlands in my Type AAs and love the result. I don't know how Auricaps are made, but better caps AND inductors help the Type AA. The Type A is a good design, but should not be used with a large amp, since accidents always happen.

I had a Yamaha CA-800 for YEARS. It was warm and smooth with my La Scalas. The bass was a bit loose, compared to the Parasound amps I have now, but it did sound very good. It could be switched to Class A and had 8 wpc. In Class A, it sounded a little bit better. The tone controls, filters, tape facillities are all great. It was 2-channel, of course

"3db then needs to be subtracted for every three feet one moves back from the speakers." Dean, this is one of your errors. SPL drops by 6dB with each doubling of distance, IIRC. The other is that your Rat Shack meter (and mine) cannot HOPE to display musical peaks that are just a few dozen milliseconds long. It is not unbelieveable to me that there are peaks 10 dB above the RS meter peak, since it is so "slow", even on the fast setting.

It may not be as hard as you think. Wher you get them, remove a tweeter and look for a string of numbers on the back, maybe in ink. Part of the number is the OEM and part is the manufacturing date. With that you can start a search for new one, recone kits or engineering data to be used to select a replacement. Let's hope the OEM still exists.

Al doesn't work for Klipsch! They would have to buy his design. I'm sure they feel they can do better for less money. Al's crossovers make little concession to cost. The Type AK-3 is said to sound much like the ALK and vice-versa. Due to driver changes, I'm not sure the ALKs would be a good substitute for the AK-4.

That's it and here is a pic of the finished product. I doubt if I published a list of components, but as you can see the inductor and black caps are Solen, the tweeter cap is a Hovland and there is a 1 uF Harmony bypass. The Solen/Harmony pair is my brother's idea. This xover makes a Heresy sound very much like a La Scala, though not exactly the same.

Probably not. The theory is that the AlNiCo reacts differently (can't remember how) to the magnetic fields induced in magnet structure by the current in the voice coil. I can't verify, or dispute it, but I'm not buying just the same.