to see if this scheme is the correct one, warm greetings.
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ACD said:
The Phase Linear 400-II are notorius known for their weak output circuit.......
I have personally repaired/replaced output devices on app. 20 different PL400's over the year, even though the PL400 never was very popular in little Denmark and I have never worked at an official PL workshop
Not having touched one before, was the heatsinking adequate? Didnt Bob carver use a 125v mains cap with 130v supply in one design?
Heatsinking was ok I think ...
However I never actually measure the temperature
Bob Carver did made some strange choices in his desig, however so did many others....
Remember the Onkyo M504 ?? Output caps did go
all the time, even though it was a good amp
Just because it was a commercial amp, doesn't make the circuit right.... That's why we make DIY
However I never actually measure the temperature
Bob Carver did made some strange choices in his desig, however so did many others....
Remember the Onkyo M504 ?? Output caps did go
all the time, even though it was a good amp Just because it was a commercial amp, doesn't make the circuit right.... That's why we make DIY
fjromero said:
fjromero
Yes, look very good schematic circuit!
No problems use MJ15003 / MJ15004 with TO3 package. Very good!
MJ15003-4 has been used many, many times before.
In good hifi power amplifiers by good professional audio designers.
....but
lineup, me personal, thinks
MJ15024 and MJ15025 .... a little bit better ....
Regards
lineup
..................................................................................................................
I post schematic#1 with MJ15024.
I post schematic#1 with MJ15024. Person#1 say: Why not use MJL3281
I post schematic#2 with MJL3281. Person#2 say: Why not use MJ21194
I post schematic#3 with MJ21194. Person#3 say: Why not use MJ21196
I post schematic#4 with MJ21196. Person#4 say: Why not use MJ15004
I post schematic#5 with MJ15004. Person#5 say: Why not use MJ15024
I post schematic#1 with MJ15024, again.
..................................................................................................................
Garden Party
But it's all right now
I learned my lesson well
You see
ya can't please everyone
so ya got to please yourself
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RickyNelson.com
.
Lineup, whats your pref with going with 15024/25 over the MJ21193/4/5/6?I have used the 15024/25 and did not like the sound in a couple of designs/ The 15003/4 sounded better in the same circuit.
Krell used (I think) the 15024/25 in the KSA-250 and I found the same edgy steely sound in that too... Dan D then had MOT design newer TO-3's which then spawned the MJ21193/4/5/6. That sound better.
regards,
K-amps said:
I have used the 15024/25 and did not like the sound in a couple of designs/ The 15003/4 sounded better in the same circuit.
Krell used (I think) the 15024/25 in the KSA-250 and I found the same edgy steely sound in that too...
Dan D then had MOT design newer TO-3's which then spawned the MJ21193/4/5/6. That sound better.
I did say I prefer MJ15024 / MJ15025 over MJ15003 / MJ15004.
I did NOT include MJ21194/3 in this compare.
I said this with the following reason in mind:
No question it is more easy in most part of world, even very remote countries,
to get either of MJ15003/4 or MJ15024/5
.... than is to find a distributor in your home country
that sells either one or both of the complementary MJ21194 + MJ21193.
If somebody can find MJ15003-4, it is a fair chance they also can get MJ15024-5.
This is the choice most people of the world have, if even there is such a choice.
These topics are read by many many more diyaudio home builders, than actually do post or even are registered.
I do not want to put pressure and maybe make people sad
if they actually can't easily buy a better transistor.
( Not to speak of the exotic, never heard of recommendations you see here sometimes.)
Not when there are more common devices, that will work well enough.
Even if I live NOT REMOTE, I had to search very long,
before I found a distributor in my country that had MJ21194 in his lists.
If he actually has got them in supply, I don't know ...
Let's hope ...
If I decide I want to but some of these GREAT DEVICES!
Nelson Pass is very good and considerate in this way:
-- He cares for audio builders to not have too difficult find those MOSFET.
-- They belong to the mainstream and can be bought most everywhere
-- And if not, he can give a good replacement suggestion.
Mister Pass, if anyone, would surely know the most exotic devices, that would be superior.
Such devices made maybe in some 100 exemplars totally,
to find at only one distributor probably in the world.
But why make people feel distressed and frustrated, when there is no need or point in doing so.
==========================================
I say like this now:
For those minorities of www.diyaudio.com members who can get
MJ21194 / MJ21193:
Have a listen to K-amps and lineup and get your exemplars as soon as you can!
.... ( don't bother with MJ21196 / MJ21195, they are no better for most audio amps! )
For all others, the great silent majority of any big forum:
Your amps will work just great with
1.) MJ15024 / MJ15025 or with
2.) MJ15004 / MJ15003.
Any difference will hardly be noticeable at all normal use of an audio amplifier!
Regards
lineup
clears this issue up==============================================
PS.
lineup has designed this
15-20 Watt N-Channel True Class A Power Follower Amplifier
using ........ that's right! .... Two MJ21194, with very good simulated data.
There are 2 smaller driver transistors, making this a simple 4 Transistors amp.
Easy to build.
Data, analysis and full schematic can be found here, if anybody missed it:
Jerluwoo MJ21194 Output Stage - by Lineup Audio Lab
Please, Read the following posts, too.
Because I posted final circuit schematic later in that topic
One would like to think that it would be good to give people all the information and let them decide what to use based on availability/price etc.
I (respectfully), strongly disagree with this "policing" attitude of keeping information from others in hopes of allying any false fears.
The MJ2119x's are not blood Diamonds... they can be had if one wanted...
If I needed patronizing of that kind, I'd go to my mother-in-law for advice.
I (respectfully), strongly disagree with this "policing" attitude of keeping information from others in hopes of allying any false fears.
The MJ2119x's are not blood Diamonds... they can be had if one wanted...
If I needed patronizing of that kind, I'd go to my mother-in-law for advice.
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