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Old 16th May 2003, 02:38 AM   #1
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Default Phase Linear 400 Question

Has anybody rebuilt a Phase Linear 400 ?.
Are mj15003/15004 suitable to use as outputs, and are any modifications required (for stability), or desired ?.

Thanks, Eric.
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Old 16th May 2003, 02:56 AM   #2
Gepetto is offline Gepetto  United States
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Default PL400 rebuild

Hi
I have rebuilt many of these.

Do not use the MJ15003/4 devices as BVceo is only 140V. Use the MJ15024/5 complements instead. If a Series 1 amp you will only need the MJ15024 devices.

Stability is not a problem with these devices in this amp. I have made this change on 4 PL400s and my PL700B as well.

Good luck with your amp.
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Old 16th May 2003, 03:48 AM   #3
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As I recall the 003/4 are a little slow. I would try the
MJ15022-27 types, which are faster and more rugged.
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Old 16th May 2003, 04:02 AM   #4
sam9 is offline sam9  United States
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Default Look at this URL

If you have not already turned this up on your own, take a look at:
http://hometown.aol.com/PhaseTek
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Old 16th May 2003, 05:52 AM   #5
djk is offline djk
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The PL400 runs on 85V so you need a minimum of 170V rated part, the MJ15003/04 won't cut it.

The MJ15024 is OK for the 400, but use the MJ21194 for the 700, it runs on 110V, SOA at 100V on the MJ21194 is 2X the MJ15024.
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Old 30th July 2003, 12:10 AM   #6
lubbie is offline lubbie  Canada
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I also decided on the MJ15024.. But where i'm having trouble is on the PreDriver.. Namely a suitable replacement for the RCA410.. I found a datasheet for it but cannot decide what are the most importent criteria for selecting a replacement.


Let me know if you need a schmatic.. I've got all the 400 series and service manuals for them. Hard to believe that there is 4 differant versions of this amp, all with little differances.

any assistance???? For your info.. Phase Linear recommended that the NEC 2sd555 be used for replacements. I decided against this as the MJ15024 is a Motorola Direct replacement, and costs $5.00/transistor less.
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Old 30th July 2003, 12:22 AM   #7
jleaman is offline jleaman  Belgium
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I had a Phase Linear 400 Series Two power amp i loved it i also had the Pre-amp to match it too. Loved that thing.. I have a question though. Does any one have the schematic for the led read out. i haven't seen amp that did that .. i mean where it moved one Line at a time and not a streak of them adding up to all the lines being lit up It was cool at night i used it as a subwoofer amp because it was a grunter. i had a marants amp that drove my little speakers. I would like to build the display board a matching pair for my proects just for something to do. : o ) Man that amp had lots of power.. i wis i still had it.

OH PS I got mine free heh. till it died. and i could not relocate a old psu for it. but oh well.

Now i got nelson pass and NICE class a stuff. ( still working on. )
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Old 30th July 2003, 12:29 AM   #8
lubbie is offline lubbie  Canada
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I have 2 of them now and will be the power amps of my home theater.. Been picking them up along the way.. both have been smoked. but in the process of rebuilding them.

The led readout never appeared in any of the manuals i've got. so i'm sorry can't help. but check out http://sound.westhost.com/ he has some wonderful projects
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Old 30th July 2003, 03:12 PM   #9
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posted by lubbie:

Quote:
But where i'm having trouble is on the PreDriver.. Namely a suitable replacement for the RCA410
I have used 2N6545 successfully as replacement for 410 in these amps.

Cheers
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Old 30th July 2003, 08:53 PM   #10
lubbie is offline lubbie  Canada
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Jason you still have it.. gladly give you some money for it.. even with the blown PSU.
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