DUMMY LOAD!!!!!!!!!!!!!!!!!!!!
- Thread starter laatsch55
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Well - I attempted to reply from work but our system keeps bouncing me out at the most inappropriate time so I'll attempt a repost from home but I have more to add now.
It's way cool that you guys have contacts with some of the Phase Linear "originals". A few months ago I had no idea that a dedicated few were so involved in keeping the name alive while making great improvements to this vintage hardware. Thanks all.
Today I placed an order with Sweetwater Sound for some Deoxit. I received a voice mail from one of their reps as one of the items was back ordered. When I returned his call he asked how I found out about their company and I told him that it was through an Audio forum. During our conversation he mentioned that he repaired Phase Linear amps (400 and 700B's) during the mid thru late 70's used by bands for live performances. The most common problem he encountered was the output stage overheating and causing damage to the amp. Small world.
Anyways - I met my wife after work at the ranch where we board our horses and she mentioned that I had received a big box today in the mail. Well I wasn't expecting a large box but sure enough when we got home here was one big ass box. I can't thank you enough - I've just done a once over and I can't believe how much stuff you included! I actually did not have a dummy test load yet - how did you know? Thanks so much. I have been listening to Shpongle on U-Tube but with the included CD's I can't wait to play them - wife's asleep now so I'll have to wait.
Way cool - thanks Lee!!!
It's way cool that you guys have contacts with some of the Phase Linear "originals". A few months ago I had no idea that a dedicated few were so involved in keeping the name alive while making great improvements to this vintage hardware. Thanks all.
Today I placed an order with Sweetwater Sound for some Deoxit. I received a voice mail from one of their reps as one of the items was back ordered. When I returned his call he asked how I found out about their company and I told him that it was through an Audio forum. During our conversation he mentioned that he repaired Phase Linear amps (400 and 700B's) during the mid thru late 70's used by bands for live performances. The most common problem he encountered was the output stage overheating and causing damage to the amp. Small world.
Anyways - I met my wife after work at the ranch where we board our horses and she mentioned that I had received a big box today in the mail. Well I wasn't expecting a large box but sure enough when we got home here was one big ass box. I can't thank you enough - I've just done a once over and I can't believe how much stuff you included! I actually did not have a dummy test load yet - how did you know? Thanks so much. I have been listening to Shpongle on U-Tube but with the included CD's I can't wait to play them - wife's asleep now so I'll have to wait.
Way cool - thanks Lee!!!
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You're welcome Dennis. If you'll notice two of those 4 ohm resistors started pushing their plugs out. That's what 700 watts at 4 ohms does to a 100watt load. They are still good, but i would cool them in water if you do any serious testing. You can series those for 200 watts at 8. It a good start anyway, and gives you something to play with until you decide how much load you really do need.
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Many thanks for these and all the other goodies.
I have been listening to the Shpongle CD's last night and today - great stuff. I'll burn some music that is similar genere of music - maybe something you don't have yet.
Yeah I noticed the bulging power resistors. Way too much input!!!!
I do have a funny story about the wire wound power resistors though.
One of our floor supervisors (late 70’s time frame) was tasked with coming up with a method for measuring a one degree peak to peak movement of a rate table designed to test a missile autopilot. He devised a circuit consisting of a big ass power resistor (250 watt) in series with an AC motor driving this mechanism. Mind you the AC was coming from a wall plug to the motor. We all told him that this is AC and maybe something like a variac would be more appropriate but he was a stubborn old cuss and wouldn't listen. When it came time to calibrate the system I was the lucky one to use this test set up. I flipped the toggle switch placing the resistor in series with wall power and guess what? Now mind you I’m concerned about overheating the resistor so I want to do this as fast as possible. As I’m am taking a reading on the deflection I smell something bad. I glance at the resistor and this white stuff starts coming out of it – kinda like taking a dump. Of course I’m breaking out laughing as I switch out the resistor from the circuit. This only took four or five seconds and most of the material inside the power resistor had “escapedâ€. I had to explain to the designer what happened to his circuit (without laughing). Of course he blamed me for taking too much time for this measurement. I explained that after four or five seconds the resistor was destroyed - not nearly enough time to take the measurement. For me and my coworkers this was very hilarious. It was the topic of discussion for weeks to come.
I have been listening to the Shpongle CD's last night and today - great stuff. I'll burn some music that is similar genere of music - maybe something you don't have yet.
Yeah I noticed the bulging power resistors. Way too much input!!!!
I do have a funny story about the wire wound power resistors though.
One of our floor supervisors (late 70’s time frame) was tasked with coming up with a method for measuring a one degree peak to peak movement of a rate table designed to test a missile autopilot. He devised a circuit consisting of a big ass power resistor (250 watt) in series with an AC motor driving this mechanism. Mind you the AC was coming from a wall plug to the motor. We all told him that this is AC and maybe something like a variac would be more appropriate but he was a stubborn old cuss and wouldn't listen. When it came time to calibrate the system I was the lucky one to use this test set up. I flipped the toggle switch placing the resistor in series with wall power and guess what? Now mind you I’m concerned about overheating the resistor so I want to do this as fast as possible. As I’m am taking a reading on the deflection I smell something bad. I glance at the resistor and this white stuff starts coming out of it – kinda like taking a dump. Of course I’m breaking out laughing as I switch out the resistor from the circuit. This only took four or five seconds and most of the material inside the power resistor had “escapedâ€. I had to explain to the designer what happened to his circuit (without laughing). Of course he blamed me for taking too much time for this measurement. I explained that after four or five seconds the resistor was destroyed - not nearly enough time to take the measurement. For me and my coworkers this was very hilarious. It was the topic of discussion for weeks to come.
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