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Old 3rd January 2010, 03:18 PM   #341
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People at Revox (i know the design team very well) told me about the BF682. They got great results so you are in good company. As far as i can see from the data sheet they have between 25 and 40mS so some sorting may be needed. Idss varies a lot too, between 10 and 25mA.
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Old 22nd May 2010, 07:28 PM   #342
kamis is offline kamis  Serbia
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Syn08, how close parallel transistors (N to N and P to P ) should be matched in HPS-4.0 ? I wish to use Sanyo 2SC3601 and 2sa1407 of which I have many pairs, all E gain groups.
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Old 22nd May 2010, 10:05 PM   #343
syn08 is offline syn08  Canada
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Quote:
Originally Posted by kamis View Post
Syn08, how close parallel transistors (N to N and P to P ) should be matched in HPS-4.0 ? I wish to use Sanyo 2SC3601 and 2sa1407 of which I have many pairs, all E gain groups.
Same beta class is more than enough. Just make sure you trim the pot to cancel the input current. It can be done down to 20nA.
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Old 23rd May 2010, 08:28 AM   #344
kamis is offline kamis  Serbia
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Quote:
Originally Posted by syn08 View Post
Same beta class is more than enough. Just make sure you trim the pot to cancel the input current. It can be done down to 20nA.
Thank you. I think that HPS-4.0 pcb PT holes are not wide enaugh for TO-126 transistor leads.
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Old 23rd May 2010, 02:16 PM   #345
syn08 is offline syn08  Canada
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Quote:
Originally Posted by kamis View Post
Thank you. I think that HPS-4.0 pcb PT holes are not wide enaugh for TO-126 transistor leads.
Right, they are not.
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Old 10th March 2013, 07:59 PM   #346
kamis is offline kamis  Serbia
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Quote:
Originally Posted by syn08 View Post
I have decided to do a PCB for the raw power supply (rather than using perf board and wiring). See the attached pictures.

.

Click the image to open in full size.
Click the image to open in full size.
Does anybody know the types, distributor and catalogue number of the smaller PCB heatsinks used in HPS 4,0 and 4.2 phono preamps?
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Old 18th October 2013, 09:52 AM   #347
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Please give me an advice!
I don't have enough knoledges about transistor but I have about 70 pcs of 2sa1038s pink marked-I suppose for lowest noise , beta= 520-all of them and I need advice for building a folded cascode with massive paralleled transistors on input and a d3a tube on the output.

Is there a good reason to make the input stage an emiter follower or even a two cascaded emitter followers as tektronix active probes for high frequency if I couple on collector resitance with the tube as in the James D variant?
audio-talk :: View topic - j-FET / Triode Phono front-end
I don't understand if miller effect is as lower as in a normal folded cascode with a npn input and the output on emitter.
If I make a sziklay compound transistor with multiple 2sa1038 and some mje340 so that I could couple on emitter and have huge gm too is that ok in terms of miller effect or phase recovery?
Instead of using 2sa1038 at lower currents I could use mje350 which I have a bunch as manufactured by ASI gold plated pins which I understood that stand pretty good on noie specs.
If inverting topology and using something like hiraga input on emitter and loading the cascode on collector will be better for mc lo cartridges?I read almost the entire topic and I couldn't found a true solid position.
I don't have another good option for lowest noise but these pnp transitors I own and I would like to find a good use for them .I made a 14 tubes preamp for phono and for mc cartridges tubes are not enough.I can't get the money for expensive input transformers so I want to walk solid state only for mc.For mm I will use the tube entry in pentode conection which is fine enough.

Last edited by dreamth; 18th October 2013 at 10:00 AM.
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Old 3rd November 2013, 02:44 PM   #348
rsavas is offline rsavas  Canada
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Try to ltspice your design?
Another MC option, Why not try using Doug Self's MC phono stage. It uses LN PNP bjt's such as Hitachi 2SA1038-84-85. They used it again in the the Elektor 2012 pre-amp. It is a simple ckt to make.
Preamp 2012 (110650-2) - ELEKTOR.com | Electronics: Microcontrollers Embedded Audio Digital Analogue Test Measurement
I have my eye on making a modified HPS 5.1 as Andrew has started doing in simulation.
http://hifisonix.com/wordpress/wp-co...-Part-One1.pdf
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