ESP P101 vs FT15K what is the best? - diyAudio
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Old 4th January 2007, 02:08 PM   #1
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Default ESP P101 vs FT15K what is the best?

hi everybody...
i'm planing to change my 2 mosfet modules with another 2
what do you think about this 2 amps?
what is the best?
is a good idea to replace my FT15K with the P101??

This is the link to the P101:
http://sound.westhost.com/project101.htm

And this is the pdf file of the FT15K

waiting for replyes
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File Type: pdf 7100-ft15k.pdf (50.8 KB, 1074 views)
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Old 5th January 2007, 02:47 AM   #2
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I've built two of the 2-channel P101s and they have been performing flawlessly from day 1 to now. They sound great-real tight bass-very detailed highs- Virtually no background noise.
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File Type: jpg p101.jpg (73.5 KB, 2150 views)
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Old 5th January 2007, 05:45 AM   #3
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Go with P101. I built the high-powered version @+/-50v rails, put massive heatsinks on it and raised the bias to 200mA........sounds unbelievable, plus the boards are readily available.
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Old 5th January 2007, 06:11 AM   #4
lineup is offline lineup  Sweden
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I would also go for ESP Project 101.
High Power, High Fidelity MOSFET Power Amplifier
Rod Elliott (ESP)
Updated 01 Feb 2004


Click the image to open in full size.

He uses good audio transistors but still such that are easy to find almost anywhere.
This is typical for Rod Elliott, like for Nelson Pass.

The input uses a pair of MPSA42.
I know these are favourite transistors of other good amplifier designers at this forum.
The current mirror uses lownoise BC559. You could use BC560 just as well.
The voltage amplification stage uses only one MJE350 and bootstrapping.
MJE350 is know to work well in VAS stages. And can take the higher voltage of the hi-power version.

The output is based on the Renesas.com
great Lateral MOSFET complementary 2SK1058 / 2SJ162 (former Toshiba transistors).
Power MOSFET for General Amplifiers
There are many hifi amplifiers, even commercial top class,
that uses these nice Audio output devices.
MOSFET does not come much better than this.
At least not for normal level of Audio Power output.
And if you want good quality sound reproduction in your loudspeakers.

He has got 2 versions.
One or two output pairs.
For normal or high listening levels. Normal or high power.


I can only say same as previous poster:
go for ESP Project101
http://sound.westhost.com/project101.htm
Note:
for this project Rod Elliott wants you to order His boards
and then you get all details and schematics for build.


Click the image to open in full size.
Current Price, for PCB boards ready to use and instructions:
P101 200W MOSFET Power Amplifier US$17.00 Ea


lineup
Lineup Audio Amplifiers
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Old 5th January 2007, 06:28 AM   #5
djQUAN is offline djQUAN  Philippines
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I have built a pair and it does very well.

accidentally shorted the outputs once and blew the fuse. nothing else was damaged.

very quiet and very good sound quality. the power rating that rod gives them seem to be small but they sound more powerful than what he says.
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Old 5th January 2007, 06:38 AM   #6
lineup is offline lineup  Sweden
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Quote:
Originally posted by XEAGLEKEEPER
I've built two of the 2-channel P101s and they have been performing flawlessly from day 1 to now.
They sound great-real tight bass-very detailed highs- Virtually no background noise.
Quote:
Originally posted by MEGA-amp
Go with P101. I built the high-powered version @+/-50v rails, put massive heatsinks on it and raised the bias to 200mA.
.......sounds unbelievable, plus the boards are readily available.
Quote:
Originally posted by djQUAN
I have built a pair and it does very well.

very quiet and very good sound quality. the power rating that rod gives them seem to be small but they sound more powerful than what he says.

when 1 man say something it may be true - but we can not be sure
when 3 men say something = the same - it is probably close to true
... this is called verification
Sometimes we can want somebody to verify.
Because we want to be able to believe in it, a bit more.


I for myself, have not built or listened to P101 2Sk1058 / 2SJ162 MOSFET Amplifier.
I can only tell from the schematic, that this is a good amplifier.
And I know Mister Rod Elliott from Australia would not publish a project
if he had not tested the performance properly
and was very satisfied with the result.


Regards to you all
lineup
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Old 5th January 2007, 11:07 AM   #7
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ok ok ok..... i understood thath the p101 is a very good amp...but what do you think abuot the ft15k??? it is also using the same fets and the mpsas in the driver stage...
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Old 5th January 2007, 11:57 AM   #8
lineup is offline lineup  Sweden
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Quote:
Originally posted by Flavio88
ok ok ok..... i understood thath the p101 is a very good amp
...but what do you think about the ft15k???
it is also using the same fets and the mpsas in the driver stage...
See my attached schematic of FT15.

Yes, it uses same output 2SK1058 / 2SJ162.
The difference is have current mirror in Second stage.
And uses not a more robust TO126 like MJE350 for voltage amplification / driver of output stage.

But FT15 uses TO92:
MPSA42 and MPSA92 .. in both input and VAS stage and for drivers!
This means probably LESS Current in second stage for drive MOSFET.
Also another difference is only Resistors R13+R14 to control bias in output.
Of course we could easy change a bit, to use diodes or Transistor for this.
Like done in ESP P101.

I think FT15 is also a very good amplifier.
But if I had to chose, I would take Elliott Project101.
Because I like to have MORE Current (=TO126) in Second driver stage.
This is from a quick look at those both amplifiers.

I say like this.
It is more up to you.
I think you would be happy with both amplifiers.
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File Type: png ft15-2sk1058-2sj162.png (12.4 KB, 2047 views)
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Old 5th January 2007, 08:37 PM   #9
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hi Flavio88,

If you would like more information, the FT15 is very similar to Randy Slone's "Design 1. Basic MOSFET Design" from his High-power Audio Amplifier Construction Manual. Randy describes it as "One of the simplest power amplifier designs possible that will provide reasonably good performance".

You would probably get more help and feedback from this group if you built the P101 though. Also, you probably know Rod is only a email away and he has his own forums for his ESP designs.

regards
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Old 5th January 2007, 09:27 PM   #10
lineup is offline lineup  Sweden
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Quote:
Originally posted by Greg Erskine
hi Flavio88,

If you would like more information, the FT15 is very similar to Randy Slone's "Design 1. Basic MOSFET Design" from his High-power Audio Amplifier Construction Manual.
Randy describes it as "One of the simplest power amplifier designs possible that will provide reasonably good performance".

You would probably get more help and feedback from this group if you built the P101 though. Also, you probably know Rod is only a email away and he has his own forums for his ESP designs.
Yes, it is maybe little known, but as Greg tells,
Rod Elliott has got his own Support DIY forum.
He may not always answer himself,
but there are a couple of other good guys over there
that would know most of howto, regarding ESP projects circuits.
FORUM - ESP Projects and Articles
Dedicated to ESP Projects and Discussions


===========================================


It is also true what Greg Erskine says,
that FT15 is using the most basic circuit
that still can drive Lateral MOSFET in a good way.
With good results.

It was very often used way back when these Lateral MOSFETs were news of the day.

See my attachment
This circuit is from a book published 1991.
26 years ago.
It is VERY much alike FT15.
Have a look, and you will see!


This was a way to design that many used
because:
- it was simple
- very few transistors
- gave very good results
- compared to other amplifiers around at this time



Regards
lineup
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File Type: jpg lateralmosfet1991.jpg (76.2 KB, 2001 views)
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