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Old 4th May 2011, 12:32 AM   #1
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Default LME based amp vs Rod Elliott amp

What amp would be best for my four polk audio m10 bookshelf speakers (the speakers are put in parallel 4 ohms per channel)

amp 1 : LME49810/LM4702 with MJE15034 Driver 2SC5200 Output


amp 2 : 60-80W Power Amplifier with MJE15034 Driver
2SC5200 Output

Question about amp 2, for Q9 can i use a BD139 mounted on the output transistors as the vbe multiplier.

are there anything i can do to amp 2 to make it sound more "audiophile like"
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Old 4th May 2011, 02:11 AM   #2
singa is offline singa  Singapore
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Hi, specification wise the LME combo is superior on paper but when
in terms of real power performance the MJ/2SC combo is unbeatable
for transient peak power,just see the specs for yourself.

So make sure you get 2SC5200 from ON semi (formerly motorola).
But I think you need the pnp version too ?
You can use BD139 but I think spec wise MJE15034 is similar in
peak power performance.Still you have to compare their Vce maximum.

As to making amp2 sound more audiophile ...make yourself a tube preamp
and maybe add a tube buffer to the cd player. Your friends will envy you.
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Old 4th May 2011, 03:32 AM   #3
klewis is offline klewis  United States
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I've used the lme49811 with great success at similar power levels. Look for a thread called national opamp inflation, also parson thread in the chip amp forum. He has some good boards for sale. this chip was designed by some pretty smart folks. Make the design modular that separates the output stage from the front end, then you can build one of each front ends and compare for yourself.

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Old 4th May 2011, 10:50 AM   #4
ATAUDIO is offline ATAUDIO  Austria
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I cannot say what is better, but I would use a power supply NOT More that 35-0-35 V if only a pair of Output transistors is in use, in order to not go over SOA limits with a 4 ohm load. Read the very good notes on the ESP article.
About the VBE transistor, if you want you can mount it together with the DRIVERS heat sink if you make a P3A, since this is a CFP topology.
Mounting it on the Output (i.e 2SC2500) heat sing will not work well in this configuration.

Then I never heard ONsemi/motorola doing 2SC5200, but they make by sure several very good transistors in that range (i.e MJL1302 / MJL3281).
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Old 4th May 2011, 02:43 PM   #5
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What about thermal compensation in the project 3 amp is it needed?

How does its sound quality compare to the tda7294?

What has higher thd and noise, lm4702 vs rod elliott amp
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Old 6th May 2011, 01:59 AM   #6
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