All Hitachi Lateral Fet amplifier for DIY described by Paul Kemble - Page 38 - diyAudio
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Old 1st March 2013, 06:58 PM   #371
wahab is offline wahab  Algeria
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Join Date: Nov 2009
Location: algeria/france
Quote:
Originally Posted by naf View Post
Hi Wahab, how about 2sc3953/sc2911 on Q10?
Yes , they are both adequate , the 2SC3953 being the better.

Quote:
Originally Posted by gaborbela View Post
Hello
For Q5 & Q6 I have at home a lot of Hitachi 2SA872A E grade Hfe400-450...
I do not have almost any use of them since the complementary unavaleble.. I will used here.
Great, they are even better than the 2SA992...

Quote:
Originally Posted by gaborbela View Post
For the other BJT I did ordered 16 pair 2SA1360Y & 2SC3423Y Toshiba.
The 16 pair must be enough for these project.
I have some Toshiba 2SA1930 & 2SC5171 at hand, may be I can use (in case for cascode) Q3/Q4 if the 16 pair would be not enough because the matching..
Greetings Gabor
2SA1930/SC5171 are not adequate , they are excellent drivers
for use with usual bipolar power transistors though.
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Old 5th March 2013, 06:34 AM   #372
srian is offline srian  Sri Lanka
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Join Date: Jan 2011
hi Gabor,

we are waiting to hear from you about the sound of the amp.

Hi alex MM,

The vizzard of PCB design, have you anything to say about the comparrison of the sound of this circuit to the famous Goldmund Memasis you did some time back.

I am awaiting eagerly torn between the two amps to start building one of them.

I would value a lot, the feed back received from you people.

At the moment I listen to Hitachi LOD HMA 4500 and Sony TA 4650 both
Vfet amps but with only 50 watts of power.

Since Wahab cct and Goldmund circuit can give in excess of 100 watts of
Vfet power, I am power hungry and waiting to select one to build.

At this moment I should also mention here that the very simple
Old Maplin 2SJ49 /2SK134 which I built 15 years ago is also a very good
contender second to none of the two commercial amps mentioned above.

Let there be Vfet sound,

srian.
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Old 7th March 2013, 09:32 PM   #373
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Join Date: Sep 2005
Hello
I did some more work.
Now I have to visit the local store to get the missing 5PC resisters, diodes and trimmers.
I didn't mounted the heatsink on the VAS transistors until I'm not finished populating 100% the board.
Also very exited to power up the amp so I can give some feed back to those who interested on these project.
I ordered twice from Ebay the trimmers and never received them, almost I waited 3 months in vain...

Greetings Gabor
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Last edited by gaborbela; 7th March 2013 at 09:39 PM.
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Old 13th March 2013, 10:56 PM   #374
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Join Date: Sep 2005
Hello wahab

I have a question
Can I use 1.5nF for C12 with out running in to any problem.The Q20 was added on the end (my lay out was 99% ready) so I used a small place what I had.
I do have Philips 1nF foil cap but to tall and it will block to mount the heatsink on Q20.
I do have some Audio cap 1.5nF if I can use that...
I have to see what the have at the store, I do like to avoid ceramic layer capacitors (many people say those are to noisy)
Usually they carry those cheap stuff.
What would you advise?
Please let me know.
Thank you
Greetings Gabor
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Old 14th March 2013, 12:35 AM   #375
wahab is offline wahab  Algeria
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Join Date: Nov 2009
Location: algeria/france
Hi , Gabor

The exact value of this cap is not important provided it is more than 0.3nF ,
so your 1.5nF perfectly fits the purpose assuming that it can withold 65V DC
permanently , i guess that 200V is a cautious enough rating.

Whatever model can be used , but as you point it ceramics are to be discarded.

At the risk of repeating myself , i ll point that so called audiophile
components are not necessary , the essential is in the transistors ,
the rest must simply be of industrial quality , no need of expensive
passive parts.

What values are you using for the supply electrolytics in the PCB ?..

Nice work , anyway , that is a well done compact PCB.
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Old 14th March 2013, 03:05 AM   #376
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Join Date: Sep 2005
Hello Wahab

Thank you very much!
That so called audio capacitor already had those, min. 100V I can't see the first number, is a left over from other project.
The front end electrolytic are 220uF 100V Nichicon KG type, I had those
The high power caps are 470uF 63V orig (red) Elna Cerafine. I took those out from the Grand Mos PC boards.
I hope not to much the 470uF. The size Cerafine a bit to big but I just could feet those..Bigger than the regular 1000V caps or any exotic same size caps.
I do have some (10PC) STD type 65V 560uF Black Gate capacitors to but those are brand new and may be I'll sell those.
To expensive to use those and they are not as good people do think or write about..
I do try use what I got.. All those resisters , caps etc in the PC boards I already had them.
I just need some resistor 5 or 6 piece for each side and the diodes & LED.
Thank you one more time.

Greetings Gabor
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