Rob
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Status Replies posted by Rob
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Hello everyone. Still looking for a cover or a TFM 55x parts unit. A 35x cover will fit also. PM me if anyone can spare the part.
Thank you
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Can a Carver MXR 130 be bridged with a Carver PM 900?
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Hey everyone. Looking for a set of rack handles for a TFM 42. PM me if you have a set to part with. Thank you in advance.
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Hi Rob, give a price on the 2000 and the 150.
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Hi Rob, give a price on the 2000 and the 150.
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Hi Rob, give a price on the 2000 and the 150.
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Rob do you still have a 2000 for sale. Seen a few on eBay. Have an excellent performing AVR100 that has been updates by Roland Barr, but looking at a 2000 for my big screen TV. sen me a quick email elioronchini@hotmail.com
Send me a cost, its physical and sound performance and any mods you have done to the unit
Thanks,
Elio
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Rob do you still have a 2000 for sale. Seen a few on eBay. Have an excellent performing AVR100 that has been updates by Roland Barr, but looking at a 2000 for my big screen TV. sen me a quick email elioronchini@hotmail.com
Send me a cost, its physical and sound performance and any mods you have done to the unit
Thanks,
Elio
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Hi Rob, give a price on the 2000 and the 150.
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Can anyone tell me, is there a way to calibrate the LED power meters on a MRX-130 or Receiver 2000? Is there a procedure I’m missing? Thank you guys in advance.
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Looking for a remote for a “receiver 2000”. PM me if anyone has a working one to sell. Thanks
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Hey Joe. Just another heads up. The remotes for the receiver are pretty much like a gain control on the volume buttons. You have to still use the volume knob to control the sound level and then the remote will add or subtract so many decibels. It won't go from min. to max. I usually put electrical tape over the remote sensor while I work on them because my shop has florescence bulbs and it will make the receiver go crazy like Robert R said.
Good luck finding a remote. I am out of them.
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Looking for parts for MXR130: rack handles, blade knobs:3, phono selector. FedEx busted these, need to replace. Appreciate any suggestions. Unit is in custody of Midwest Audio in Arlington Heights IL for repairs.
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The phono button on the display is broken off? if it is, and you still have the button it will be a risky repair. The standoffs that the PC boards are mounted to on the back of the display are very fragile and usually break when removing. I have had to rebuild those with epoxy so I can put them back together. The blade knobs can be bought from Les @Circuits & Conceptsand I have a pair of rack handles but they are'nt in the greatest condition. Maybe a similar color paint can help them out. I do have some display units as a whole package.
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MXR-130- I have an MXR-130 I’ve been trying to bring back operational and it looks like the last issue I’m having is when the FM is on and I press the asymmetrical noise reduction engage switch the, the FM goes extremely faint in the background and is totally distorted. The 4 hot resistors have been changed. I also noticed diodes D73-D76 are very hot. I’ve read about the hot resistors but don’t remember ever seeing anything about the diodes running hot. Any thoughts? Should I just replace the noise reduction board?
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Can anyone offer some information, is there a reason signal wires are twisted onto board stakes vs being soldered.
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Does anybody have a speaker selector knob for a MXR130 they would like to sell. Hit me up if so. Thanks
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If you cant find one Les @Circuits & Concepts has knobs. But they are not the same as the originals. They are aluminum and have a set screw.
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Hi guys, I had a couple pictures of my bias millivolts and where I took those readings. I can’t figure out how to upload the pics from my photos to the site. Can someone assist this possibly technology challenged soul lol? Thank you in advance.
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Hello - I'm interested in some help debugging a problem with my M 200-t amplifier. I find that I am able to play content from a tuner without any issues but find that I have protection circuit trips with records that have strong bass content. The Doobie Brothers are particularly good at causing a "trip" to occur. I have tested the various protection circuits per the service documents where it is indicated that a 2hz signal will cause a trip and a 4 hz signal will not (on the bench with 8 ohm 120W loads). I thought this frequency difference was extremely close, almost insignificant, but the additional 2 hz did in fact matter as was indicated. The infrasonic filter was active and I am using a magnetic cartridge feeding input 1 ( not the moving coil input ). I get protection tripping at about 50% volume playing. This is a louder than normal use for me but it causes tripping reliably in about 1 hour. BTW: Full power is set at 32 Vrms into 8 ohms with 56.0v at now recapped 3000uf electrolytic caps ).
The very low intermittency has made this a pain to trouble shoot. I'm feeding 60w Wharfdale speakers and I have tried other units as well. No difference. I have a decently equipped electronics lab and I'm interested in suggestions in narrowing the problem to a solution while still maintaining the original protection limits.
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Hello - I'm interested in some help debugging a problem with my M 200-t amplifier. I find that I am able to play content from a tuner without any issues but find that I have protection circuit trips with records that have strong bass content. The Doobie Brothers are particularly good at causing a "trip" to occur. I have tested the various protection circuits per the service documents where it is indicated that a 2hz signal will cause a trip and a 4 hz signal will not (on the bench with 8 ohm 120W loads). I thought this frequency difference was extremely close, almost insignificant, but the additional 2 hz did in fact matter as was indicated. The infrasonic filter was active and I am using a magnetic cartridge feeding input 1 ( not the moving coil input ). I get protection tripping at about 50% volume playing. This is a louder than normal use for me but it causes tripping reliably in about 1 hour. BTW: Full power is set at 32 Vrms into 8 ohms with 56.0v at now recapped 3000uf electrolytic caps ).
The very low intermittency has made this a pain to trouble shoot. I'm feeding 60w Wharfdale speakers and I have tried other units as well. No difference. I have a decently equipped electronics lab and I'm interested in suggestions in narrowing the problem to a solution while still maintaining the original protection limits.
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Hello - I'm interested in some help debugging a problem with my M 200-t amplifier. I find that I am able to play content from a tuner without any issues but find that I have protection circuit trips with records that have strong bass content. The Doobie Brothers are particularly good at causing a "trip" to occur. I have tested the various protection circuits per the service documents where it is indicated that a 2hz signal will cause a trip and a 4 hz signal will not (on the bench with 8 ohm 120W loads). I thought this frequency difference was extremely close, almost insignificant, but the additional 2 hz did in fact matter as was indicated. The infrasonic filter was active and I am using a magnetic cartridge feeding input 1 ( not the moving coil input ). I get protection tripping at about 50% volume playing. This is a louder than normal use for me but it causes tripping reliably in about 1 hour. BTW: Full power is set at 32 Vrms into 8 ohms with 56.0v at now recapped 3000uf electrolytic caps ).
The very low intermittency has made this a pain to trouble shoot. I'm feeding 60w Wharfdale speakers and I have tried other units as well. No difference. I have a decently equipped electronics lab and I'm interested in suggestions in narrowing the problem to a solution while still maintaining the original protection limits.
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I found some good amp pin readings from an amp I repaired. This from a topic that @Dadvwstarted. M200t repair. Lots of information in that topic.
A lot of your pin voltages are off. I dont know if this will help but these are good working voltages with nothing hooked up to the amp.
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Hello - I'm interested in some help debugging a problem with my M 200-t amplifier. I find that I am able to play content from a tuner without any issues but find that I have protection circuit trips with records that have strong bass content. The Doobie Brothers are particularly good at causing a "trip" to occur. I have tested the various protection circuits per the service documents where it is indicated that a 2hz signal will cause a trip and a 4 hz signal will not (on the bench with 8 ohm 120W loads). I thought this frequency difference was extremely close, almost insignificant, but the additional 2 hz did in fact matter as was indicated. The infrasonic filter was active and I am using a magnetic cartridge feeding input 1 ( not the moving coil input ). I get protection tripping at about 50% volume playing. This is a louder than normal use for me but it causes tripping reliably in about 1 hour. BTW: Full power is set at 32 Vrms into 8 ohms with 56.0v at now recapped 3000uf electrolytic caps ).
The very low intermittency has made this a pain to trouble shoot. I'm feeding 60w Wharfdale speakers and I have tried other units as well. No difference. I have a decently equipped electronics lab and I'm interested in suggestions in narrowing the problem to a solution while still maintaining the original protection limits.
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I think you are getting closer and I have been so busy at work and school that I haven't been on the site much. A little trick I learned and I dont know if it will help but it might be worth a try and it will also keep the heat more concentrated is to use an adjustable soldering iron and keep the temp warm enough to heat components and maybe heat up some of those transistors with it.
Maybe if its an output then maybe it needs to be cleaned and repasted or silpads in place of the paste. I have worked on a lot of these 200's and seems like none of them have the same problem except burning up diodes in the bridge rectifiers but this is Definitely not the same. I will be watching to see the outcome on this challenge.
Thanks for communicating with me.
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Hello - I'm interested in some help debugging a problem with my M 200-t amplifier. I find that I am able to play content from a tuner without any issues but find that I have protection circuit trips with records that have strong bass content. The Doobie Brothers are particularly good at causing a "trip" to occur. I have tested the various protection circuits per the service documents where it is indicated that a 2hz signal will cause a trip and a 4 hz signal will not (on the bench with 8 ohm 120W loads). I thought this frequency difference was extremely close, almost insignificant, but the additional 2 hz did in fact matter as was indicated. The infrasonic filter was active and I am using a magnetic cartridge feeding input 1 ( not the moving coil input ). I get protection tripping at about 50% volume playing. This is a louder than normal use for me but it causes tripping reliably in about 1 hour. BTW: Full power is set at 32 Vrms into 8 ohms with 56.0v at now recapped 3000uf electrolytic caps ).
The very low intermittency has made this a pain to trouble shoot. I'm feeding 60w Wharfdale speakers and I have tried other units as well. No difference. I have a decently equipped electronics lab and I'm interested in suggestions in narrowing the problem to a solution while still maintaining the original protection limits.
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I am thinking that when you say 3000 uf caps that you have replaced the original 55v rail caps with (4) 3000's? It might not make a difference but have you tried replacing them with (2) 63v 6800uf caps? When the unit goes into protection mode, did you measure voltages at the IC2 pins to see what changed? I am not a big scope user but do use the meter a lot. I would look for voltage changes and then check components in that circuit.
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Looking for a C1 volume knob.
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