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Old 18th September 2010, 01:54 PM   #561
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Hi Nigel
Thanks for your Help But I think I will build something else when it become a struggle and to confusing to get the correct parts this takes away the fun of this hobby for me I think I will build an amp where I can get all the parts without this hassle
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Old 18th September 2010, 02:25 PM   #562
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Hello
You have to make a plan about the amplifier you want to build .
You have to know the quality of the amp before you decide ' I want to build these or that" !
If you start something and after you change your mind you probably end up with amp later you won't like it .. Waste of money..
The Mostre is great amp if carefully built .
That amp has the reputation , quality !
To give up because you don't find a part one or two day just not worth it.
There are great new parts but you have to study and do some test , research.
I had the original Hiraga Class A transistors and I sold them because I find better sounding parts ! I did tested!
Even N Pass wrote it is possible to replace those old parts with a new one . But you have to test them !
JFet available on the Ebay , Even matched set for $10 2 pair . You can use 2SK170 &2SJ74 BL , Y , GR , V grade . You have to adjust the 1K resistor to set up the right bias.
For example buy 2PC 1K trim pot , when you know the right value replace it with resistors.
I think there is no reason to give up something specially if you have the most of the parts which cost more.
Like transformer , heat sink etc .
Which amp you want to build , the Class A or the Le Monstre??
You have to have the DIY spirit , do not give up.
Also use the Net to find out the transistor complementary parts .
Do not mix the up , not enough just one PNP and another NPN!
I wrote these to encourage you , not to criticise , I have over 21 years DIY experience . I know sometimes frustrating to get the right parts but to solve the problem do not change all the amp to something else!

Greetings

Last edited by gaborbela; 18th September 2010 at 02:28 PM.
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Old 18th September 2010, 02:49 PM   #563
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Location: Newtonhill Aberdeenshire
Quote:
Originally Posted by gaborbela View Post
Hello
You have to make a plan about the amplifier you want to build .
You have to know the quality of the amp before you decide ' I want to build these or that" !
If you start something and after you change your mind you probably end up with amp later you won't like it .. Waste of money..
The Mostre is great amp if carefully built .
That amp has the reputation , quality !
To give up because you don't find a part one or two day just not worth it.
There are great new parts but you have to study and do some test , research.
I had the original Hiraga Class A transistors and I sold them because I find better sounding parts ! I did tested!
Even N Pass wrote it is possible to replace those old parts with a new one . But you have to test them !
JFet available on the Ebay , Even matched set for $10 2 pair . You can use 2SK170 &2SJ74 BL , Y , GR , V grade . You have to adjust the 1K resistor to set up the right bias.
For example buy 2PC 1K trim pot , when you know the right value replace it with resistors.
I think there is no reason to give up something specially if you have the most of the parts which cost more.
Like transformer , heat sink etc .
Which amp you want to build , the Class A or the Le Monstre??
You have to have the DIY spirit , do not give up.
Also use the Net to find out the transistor complementary parts .
Do not mix the up , not enough just one PNP and another NPN!
I wrote these to encourage you , not to criticise , I have over 21 years DIY experience . I know sometimes frustrating to get the right parts but to solve the problem do not change all the amp to something else!

Greetings

Yep Sure I do understand what you say but troubled is I am a beginner at this and I see it as too much variation of transistor part numbers for this amp plus I donít want to search the word wide for a set of transistors just for one amp
I have built a couple of things but mostly Tube Phono stage and Tube Single ended Headphone Amps so I think I will consider a F3 maybe the F4 or the JLH from Geoffís the Class A amp website least I can get the transistors for it Easily without the confusion of different part numbers
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Old 18th September 2010, 04:06 PM   #564
njepitt is offline njepitt  United Kingdom
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Hi Colin,

I think you'll find what you need if you keep looking - the links gaborbela and I posted above will help, and I'm sure you can find other on the internet.

If you really think it's too much trouble then since you already have the pcb (right?) why not do the "modern equivalents" 8W version on the link I posted above? It uses BC550/560 and TIP2955/3055, which are available just about anywhere, and 2SK246/2SJ103, which you can get from
the Ambslab link above.

Cheers

Nigel
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Old 18th September 2010, 05:15 PM   #565
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Yep I have seen that version with the BC550/560 but thatís my point two many versions of the amp plus thereís a thread I have seen somewhere that saying using different transistors from the originals changes the Iimpedance of the amp from 4ohms I think It said to about 20 ohms not sure why but its drifting away from what the amp is about in my view Also the TIP2955/3055 sound a bit too dark for my taste the Quad 303 comes to mind with theses transistors you see thatís the problem that good amp can be ripped a part and cloned that there no longer the good amps you once knew
PS if I come across the correct transistors I will have a go at the amp but as I have said I do not want to surf the planet for parts that may not even work sorry but Diy Audio for me is about building not searching for obsolete parts that may not be matched or even work when to get them
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Old 18th September 2010, 07:11 PM   #566
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Hello
Kristijan tested both verision and he wrote he didn't heard any diference between the old and new type of transistors !
I don't know if it change the impedance , I dont think so!
JEAN HIRAGA - Le Monstre Amplifier PCB
Greetings
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Old 18th September 2010, 08:59 PM   #567
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Ok perhaps he tested it and got the different impedances
Just to say it may sound like I Am being ungratefully to some of your help please donít think this as this is not indented
So to Start Again
We need
2SC1775/2SK170
2SA872/2SJ74
2SB716/2SD756
Right I Have now source the 1775 so letís say I have the 2SC1775 for the moment so ok
We have
2SC1775/2SK170
2SA872
2SJ74 Replacement is a 2SJ103
2S716 Replacement for is a 2SB647

/2SD756 Replacement for is a 2SC2632

So letís say
Q1 2SC1775
Q3 2SK170
Q4 2SB647
Q5 2SA 872
Q7 2SJ103
Output
Q6 2SC5200
Q8 2SA1943
Please Note the replacements were recommended by my supplier
Attached Images
File Type: jpg ScreenShot002-1.jpg (50.1 KB, 596 views)
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Last edited by colin.hepburn2; 18th September 2010 at 09:10 PM.
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Old 18th September 2010, 10:19 PM   #568
njepitt is offline njepitt  United Kingdom
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Hi Colin,

Don't worry - I can remember having trouble finding parts for the Monstre, and believe me, it's a lot harder down here in Brazil than up in Scotland!

From your last post it seems you are planning on switching the 2SJ74 for a 2SJ103 while keeping the 2SK170. I don't think this will work well - there is nothing wrong with the 2SJ103, but if you use it then you should also change the 2SK170 for 2SK246. This is because 2SJ74/2SK170 are a complementary pair, as are 2SJ103/2SK246. This isn't a big problem - anywhere you can find 2SJ103 you will probably find 2SK246 also. (Ampslab, linked above, for example.) You can keep the 2SK170 to use in some other project - there are loads of schematics on the Pass Labs forum here that use them.

I used a non-complementary jfet pair on the first one I built (8W version) and I had to mess around with the circuit a good deal to get dc offset down to sensible levels, which was really a pain, and I'm sure there were plenty of other things wrong with it as a result. There's no point in saving a little work finding the right parts now only to create work after the amp is built...

Similar things probably apply to the other pairs.

Cheers

Nigel
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Old 18th September 2010, 11:01 PM   #569
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Hello

I say the same , when you have a transistor, fet or JFet please look up the complementary parts . You can't replace the 2SJ74BL with 2SJ103BL and leave the 2SK170BL . They will not work properly together...
At JFet you have to pay attention what grade BL ,GR ,V ,Y etc .
Even if they are complementary pairs and one is BL grade , the pair is GR not the best idea to use them !
You will end up with a big offset and that just a small problem.
These is the original Hiraga Le Monstre!
For example
2SJ74BL complementary pair 2SK170BL
2SA872E ------------------ 2SC177E
2SB716 -------------------2SD746
2SB754---------------------2SD844
If you change the NPN you have to find the complementary part PNP and change that to.
The transistors has different MHz (speed), pF(capacitance) , etc .Those are very important!
That is why you can not exchange them!
Other wise you end up with a mess.
I built these amp , I sold at least 80 kits with home made PC board no complain at all.
I wrote on the Ebay you can get matched (important that to) pair 2SJ74BL & 2SK170BL .
You have to buy them !In case if they aren't matched you end up one side sound different than another !
Seriously!
The black end white the original schematic! If you want the orig Le Monstre please use that!
Believe me better to get the right parts from the begening , atherwise you will spend much more .
I just want to help !
Greetings
Attached Images
File Type: png Hiraga-Monstre-Monster-Class-A-amplifier-schematic.png (31.2 KB, 577 views)
File Type: gif hir-cir.gif (8.2 KB, 568 views)
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Old 19th September 2010, 04:37 AM   #570
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Join Date: Jan 2003
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Quote:
Originally Posted by gaborbela View Post
Hello

I say the same , when you have a transistor, fet or JFet please look up the complementary parts . You can't replace the 2SJ74BL with 2SJ103BL and leave the 2SK170BL . They will not work properly together...
At JFet you have to pay attention what grade BL ,GR ,V ,Y etc .
Even if they are complementary pairs and one is BL grade , the pair is GR not the best idea to use them !
You will end up with a big offset and that just a small problem.
These is the original Hiraga Le Monstre!
For example
2SJ74BL complementary pair 2SK170BL
2SA872E ------------------ 2SC177E
2SB716 -------------------2SD746
2SB754---------------------2SD844
If you change the NPN you have to find the complementary part PNP and change that to.
The transistors has different MHz (speed), pF(capacitance) , etc .Those are very important!
That is why you can not exchange them!
Other wise you end up with a mess.
I built these amp , I sold at least 80 kits with home made PC board no complain at all.
I wrote on the Ebay you can get matched (important that to) pair 2SJ74BL & 2SK170BL .
You have to buy them !In case if they aren't matched you end up one side sound different than another !
Seriously!
The black end white the original schematic! If you want the orig Le Monstre please use that!
Believe me better to get the right parts from the begening , atherwise you will spend much more .
I just want to help !
Greetings
Hi
OK yes I know you are trying to help and thank you for that
please take a look at this list taken from my supplier now maybe you can see why I am confused as to which transistors i require the complement are the transistors that i have pleas take a look for your selfs at Cricklewood Electronics - CCTV. CCTV Equipment. CCTV Systems. Digital CCTV Cameras

Part No.: 2SA872A

PNP TO92 ECB 120V 50mA 200MHz Very Low Noise Audio. Complement to 2SC1775A
Part No.: 2SC1775A

NPN TO92 ECB 120V 50mA 200MHz Very Low Noise Audio. Complement to 2SA872A

Part No.: 2SJ74

PFET TO92 go to 2SJ103

Part No.: 2SB716

2SB716 PNP TO92 ECB Suggested Equivalent: 2SB647

Part No.: 2SD756

NPN TO92 ECB go to 2SC2632
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