Well I did do all them things with the bulb tester to the main amp, did the same with the preamp,hooked up the unit, used some cheap speakers and everything actually worked. Only issue was I had to use the rear outputs on the preamp to the main amp inputs, I originally had them hooked up to the front outputs, and the unit sent no signal to the speakers. I don't know why, but it works this way so I will leave well enough alone. I do have the speaker module ordered and will use the cheap speakers until it gets here. I would like to thank everyone who offered any suggestions to help get this unit going. I have had it for a long time and sure did not want to burn it up. I really do appreciate all your words of wisdom! Thank you DRW.
Hooking up my phase linear model 2000 preamp, to my model 400 main amp.
I had these two units for years,hooked them up back in 2001,found they needed some work, had them repaired they have sat in the shipping box ever since. I did hook then up years ago but don't remember how I did it. Now I have them again, and want to get them going . And don't want to burn something up hooking them up wrong. Can someone give me some direction how to do this. Thanks DRW.
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So will 1.0 amp or 1.5 amp be to big.Either is fine to supply power to the protection module. I should not have to do this for the preamp, correct?I recommend using the bulb tester to power up the preamp too, just use a 25W light bulb for an hour. BTW, connect a pair of cheap speakers for testing before you install the protection module. |
Well I did get that light bulb tester made. It was really quite easy. I hooked it up to the amp,turned it on,used a 25 watt light bulb only put out 49 ac volts, ran it for 10 -12 hours.The second bulb was 65 watts, it put out 93 volts, will let it run for 12 hours.Then will run a 100 watt bulb like you said for an hour. then power up the amp on it's own. Hopefully everything will work out good. Then I should be all set, just have to wait for the speaker module, I did pick up two,12 volt transformers. One 1.0 amp the other 1.5 amp. I hope these will be big enough to power that module. I will keep you posted about how this goes, probably will fire both units tomorrow. I should not have to do this for the preamp, correct? |
Ok first, I will get that module, that sounds like a realistic item to save my speakers. And I did read through that post on that site about that light bulb tester. And for the most part the assembly sound pretty basic. I don't think I should have any problems putting that together. And then I will recharge the capacitors as you instructed. It may take me a few days to put that light fixture together, but I will let you know how things are going as they progress. Thank you for the positive feedback, at least now I have a direction which to go. I do appreciate all your help, Again thank you. DRW. |
Is this the one that I should get?Yes, or bigger relays but not smaller And this light bulb tester will work to charge the capacitors, so I should not need to buy a Variac for this one time use?Yes, you can start with a 15w incandescent light bulb for about 12-24 hrs, then use a 40w bulb for another 12-24 hrs to reform the capacitors, then follow by a 100w bulb for an hour to make sure the amplifier still working fine. |
Any suggestions on how I can do this, without the VariacIf you DIY, a 100W incandescent light bulb will work well in this case: https://www.radiomuseum.org/forum/current_limiting_with_a_dim_bulb_tester.html If you aren't experienced with wiring, or those diagram looks confusing, get assistance from someone more experienced. I did look at that speaker protection module on ebay, there are a few, what size would I need. What would be the best choice? I have never even seen any of of these, I will get whatever one needed to protect my speakers whatever the cost. How does it get hooked up, just hook it up in line from the amp to the speakers like you would a fuse.In the picture of the link show the connections, you also need a 12vdc adapter to power the module. http://www.ebay.com/itm/UPC1237-Dual-Channel-Speaker-Protection-Circuit-Board-Boot-Mute-Delay-DC-12-... |
Now addressing the issue about using a Variac to power up this amp and preamp. how big of a unit do I need, I did look on amazon and saw lots of them, but have no Idea what I should use. And really don't want to spend a lot of money on something I probably use this one time. Any suggestions on how I can do this, without the Variac,or is this the only reasonable way to save this amp. |
I did look at that speaker protection module on ebay, there are a few, what size would I need. What would be the best choice? I have never even seen any of of these, I will get whatever one needed to protect my speakers whatever the cost. How does it get hooked up, just hook it up in line from the amp to the speakers like you would a fuse. |
Some user install speaker protection module in
model 400
to protect their speakers http://www.ebay.com/itm/UPC1237-Dual-Channel-Speaker-Protection-Circuit-Board-Boot-Mute-Delay-DC-12-... |
Since they haven't been turned-on in years I recommend using a VARIAC to slowly bring up the AC voltage (over,say, a 12 hour period) to avoid stressing the power supply caps in both the pre and power amp. And yes, the 400 does have a reputation for troublesome behavior - I have one myself (though not in present use). Good luck! |
I did finally find an owners manual And it even said one should put an inline fuse in the loop, to prevent that from happening. They recommend a 1, 11/2, to a 2 amp. any thoughts about this. I just don't want to put heavy of a fuse and have the current walk through it. I do appreciate the words of wisdom, I never thought that could happen. And I am running a pair of JBL LX 55 's, and a pair of infinity IL 40's. so yes I don't want anything to happen to either of them. again thank you. |