rodman99999
Responses from rodman99999
| Hafler DH300 Monoblock forever? Yes- those are the ones. Be careful from whom you buy the caps. Believe it of not; aluminum electrolytic capacitors have a shelf-life. re: the variac- It's good to bring the voltage up slowly(and, "reform" them), when electrolytics haven't been po... | |
| Hafler DH300 Monoblock forever? You are correct, concerning the 2.2ohm resistor(R45/pn 133022). There was only one provided, in the kit. The DH-200 schematic shows that on the ground of the left input. Given the age of your amps(30yrs+), you might consider obtaining some new pow... | |
| Hafler DH300 Monoblock forever? Take a look at the twisted wire pairs from the input jacks. If they are each connected directly to terminals 1 & 2 of both PC-6 boards, you should be good to go(in stereo). If it's bridged for mono operation; only the left input will be connec... | |
| Hafler DH300 Monoblock forever? No! Both active component boards(PC-6) of the original DH-200 will still be in place. The PC-7A(bridging circuit) is a separate, much small board, that should be located/mounted on the rear of the right heatsink, it's components facing to the rear... | |
| Replacing 6550s with KT 88s I wouldn't be a bit surprised if brand new KT88s sounded better than end-of-life 6550s, of ANY brand, in ANYONE'S system. Happy listening! | |
| What is a high end stereo SUPPOSED to sound like? I couldn't have said it better: ( http://www.ultrahighendreview.com/the-sound-of-one-hand-clapping/ ) If this is/was a repeat, sorry! | |
| When to repair or replace speakers? A very talented man, of many passions. Most of which; I share(though I'm forced to pursue them on a truncated shoestring). I haven't spoken to him a great deal, but have always enjoyed the conversations. | |
| Hafler DH300 Monoblock forever? Hafler made a bridging kit for the DH-200. You can find the manual here: ( http://www.hafler.com/techsupport/pdf/DH-202_PC-7_bridgeKitForDH-200.pdf ) Your amp probably has this installed. If you can recognize the circuit(the PC-7 board), inside yo... | |
| Fuses that matter. @metro- Perhaps(If you listen to COWS, or their BY-PRODUCTS) | |
| When to repair or replace speakers? IF your drivers are the problem; I second contacting Bill at Millersound. He'll insure they are as close to their original parameters as possible, when rebuilt(very important, performance-wise). | |
| When to repair or replace speakers? It's possible that the voicecoil(or former) is rubbing the magnet plate or pole piece. It's important, when trying to determine if rubbing is occuring, to insure an aligned movement of the voicecoil in the gap. The driver should be out of the cabi... | |
| Fuses that matter. @Ccstevenson- Well Stated! | |
| When to repair or replace speakers? A bad power supply filter cap(power amp) sometimes results in the same symptoms. That can sound exactly like a voicecoil bottoming out. If you can get to the built-in amps: look for signs of leakage around the electrolytic caps. | |
| Risk using amp Wattage than speaker rating? YES- You've both gotten the point, precisely. For those customers that came in with toasted tweeters; I gave a little clipping demo and sermon. I also had a little tweeter protection circuit(that I built), comprised of two zener diodes, hot-melt g... | |
| Risk using amp Wattage than speaker rating? Having repaired speaker systems for a couple decades; I can assure you that high powered amps can damage low power rated systems. Crossover capacitors are rated for only so many volts, and lots of manufacturers skimp there. I've lost count of how ... |