rw_designs

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  1. Crown D-150A - Healthcheck!

    Karlos, I really appreciate your help and will contact Crown very soon. I think the main caps are pretty important to be done at this point. I will be sure to do the others as well. This amp is precious to me and still sounds magnificent so I need to take care of her. Please check back sometimes if I have a post, I have not heard from anyone but you and its one of the most famous Crown amps of all time!! Thank you and take care Karlos. Ron
  2. Crown D-150A - Healthcheck!

    Karlos, Thank you so much for responding to my post. I have had this amplifier since forever and it was mine new. I was going to replace the small caps on the main bord - there is one at 160 volts rated though do you mean that one as well? I will adjust the offset to zero. Also, my biggest concern was the main filter caps the 9600uf caps. They are old now what should I do with them? Should they be replaced and where would I get them? Thank you for helping me. Ron
  3. My Crown D-150A -Health Check!

    I like to think this way about it and yet I can't help but think I owe her someting. Really though, its still like new and has been a workhorse for years. Thank you so much. Maybe others will chime in too. Ron
  4. Hello everyone, I may have posted this on the wrong forum so I have reposted here. I am a newbie as you can see and am writing to gain some knowledge on how my D-150A may be fairing after all these years. I bought it new in 1979 for 689 dollars at a high end Stereo Shop here in Rochester, NY. It has always been cared for very well as it is part of a living room system and is in practically like new condition. For 33 years I used it to power four Advent Loudspeakers at a 4 ohm load. Its never given me a problem not even once. I have moved the Advents to another system in the house and purchased a set of Martin Logan Preface speakers which are 4ohm rated at 200 watts. I think my 150 can produce 180 watts rms at 4ohms all day long. I have to say the amplifier sounds beautiful still with the new speakers but I was wondering if I should be looking at any kind of service for this amp. I am a Technician and worked in electronics for 25 years and now I write for a living. I have been repairing vintage gear for a year or so after getting away from electronics for about ten years just to get back in the swing of things. I am using a Carver C-4000t preamp for the D-150A and they play well together. Can anyone tell me if I need to replace the main caps for this amp or any other parts at this point in it's life? I am sure they are getting quite old now but I don't want to chance doing anything wrong in attempting the work myself without the proper guidance. It sounds full and healthy and powerful. The IOC's light on occasion which the manual says is normal. I keep the volume down a bit to avoid it if I can. The power light dims on heavy bass passages but thats all I can really say in observing its operation. Are there parts I should replace and can I get them from Crown? What would the experts here have to say on my situation? Thank you all for your help - I really love this amp as I am sure you must know. Ron Edit: Forgot this - with the inputs at zero the left channel dc output was 0.0mv and the right channel was 1.47mv.
  5. My Crown D-150A -Health Check!

    Wow 6 hrs in between your 2 post, please just be a bit patient this forum is not monitor by Crown staff. It was a legitimate question. I am new to this forum and I thought maybe I posted in the wrong area. Thank you so much for your help!
  6. Hello Everyone, I am a newbie as you can see and am writing to gain some knowledge on how my D-150A may be fairing after all these years. I bought it new in 1979 for 689 dollars at a high end Stereo Shop here in Rochester, NY. It has always been cared for very well as it is part of a living room system and is in practically like new condition. For 33 years I used it to power four Advent Loudspeakers at a 4 ohm load. Its never given me a problem not even once. I have moved the Advents to another system in the house and purchased a set of Martin Logan Preface speakers which are 4ohm rated at 200 watts. I think my 150 can produce 180 watts rms at 4ohms all day long. I have to say the amplifier sounds beautiful still with the new speakers but I was wondering if I should be looking at any kind of service for this amp. I am a Technician and worked in electronics for 25 years and now I write for a living. I have been repairing vintage gear for a year or so after getting away from electronics for about ten years just to get back in the swing of things. I am using a Carver C-4000t preamp for the D-150A and they play well together. Can anyone tell me if I need to replace the main caps for this amp or any other parts at this point in it's life? I am sure they are getting quite old now but I don't want to chance doing anything wrong in attempting the work myself without the proper guidance. It sounds full and healthy and powerful. The IOC's light on occasion which the manual says is normal. I keep the volume down a bit to avoid it if I can. The power light dims on heavy bass passages but thats all I can really say in observing its operation. Are there parts I should replace and can I get them from Crown? What would the experts here have to say on my situation? Thank you all for your help - I really love this amp as I am sure you must know. Ron Edit: Forgot this - with the inputs at zero the left channel dc output was 0.0mv and the right channel was 1.47mv.