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Old 31st May 2004, 11:23 AM   #11
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Join Date: May 2004
Location: Atlanta Georgia Area
Default ESP project 3a looks right up my ally

Thank you djk.

Any of you build this one?

Think my heatsinks are big enough?
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Old 31st May 2004, 05:10 PM   #12
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If you have many transformers you may put 2 in series (secondary) and get a voltage of 88 volts CT ( if properly phased ) and then you can build a 100 - 150 watts in 8 ohms. I am no shure but maybe a LEECH low tim could work if the voltage is no too high with 2 transformer in series.
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Old 31st May 2004, 05:33 PM   #13
jaycee is offline jaycee  United Kingdom
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P3A is a great suggestion, this is a good amplifier that is fairly tolerant of parts. However I probably wouldn't bother with the 3055's unless you can get some 2955's to go with it. MJ15003/04 are easy and cheap enough to get and will work well for a P3A circuit.

Those heatsinks should be fine if one is used per channel. You could make a nice pair of monoblocks if you have two of those units available. The most expensive part of building an amplifier, I have found (especially if you get all the transistors as samples) is the heatsinks, transformer, PSU caps and chassis
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Old 1st June 2004, 11:00 PM   #14
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Gathering parts for project 3a and could use some more help,can any one direct me as to what specs of MJL4281A (NPN) and MJL4302A (PNP) that i need to look for in replacement TO-3 case models? I would guess just E-C voltage rating, Dissipation , and current rating? Any reason 3055s and 2955s wouldn't drop right in?
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Old 1st June 2004, 11:07 PM   #15
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Scratch that last post was answered already, I can compare the specs of the other suggestions.
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Old 2nd June 2004, 12:56 AM   #16
jaycee is offline jaycee  United Kingdom
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Using MJ15003/MJ15004 instead of MJL4281/4302 will work just fine in the P3A. The newer MJL transistors do have a better quality but the circuit works fine with the MJ15003/04's.

It may even be possible to use the heatsink you have with flatpack transistors as well. You could always get some kind of L bracket, bolt the flatpacks to it, and bolt the L bracket to the heatsink.
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