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Simplistic NJFET RIAA
Simplistic NJFET RIAA
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Old 7th January 2011, 06:11 PM   #5731
Salas is offline Salas  Greece
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Simplistic NJFET RIAA
Quote:
Originally Posted by SGregory View Post
Salas,
It has been more than a few days, but I finally remembered that I had the cartridge in my briefacse to weigh.

Stock Mounting hardware = 0.6741g
Denon 103R = 8.7520g

measured on a NIST traceable Mettler Lab Scale.
8.5g their advertised net weight spec. At least this one is close. Thanks a lot. Mass figures noted.
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Old 7th January 2011, 06:50 PM   #5732
merlin el mago is offline merlin el mago
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Quote:
Originally Posted by SGregory View Post
Salas,
It has been more than a few days, but I finally remembered that I had the cartridge in my briefacse to weigh.

Stock Mounting hardware = 0.6741g
Denon 103R = 8.7520g

measured on a NIST traceable Mettler Lab Scale.
Usefull information for Denon DL103R owners, thank you
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Old 8th January 2011, 11:55 AM   #5733
RCruz is offline RCruz  Switzerland
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Thank you Sgregory

Very good info.
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Old 11th January 2011, 07:25 AM   #5734
smpkje is offline smpkje  Greece
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I have used the published drawing on PDF for MC (56db).
I made only one channel for the moment and it works perfectly, but I need 3-4 db more gain. How can I get it with less change on it, without lose of quality?
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Old 11th January 2011, 07:38 AM   #5735
Salas is offline Salas  Greece
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Simplistic NJFET RIAA
Thats a bit tricky. Which one is your cart? You talk the DEC10 2010 PDF?
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Old 11th January 2011, 07:54 AM   #5736
smpkje is offline smpkje  Greece
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I am talking about 10.12.F0. My cart is Shelter 501 (0.4 mV out).
Anyway I’ll make one more channel to listen and if is not enough, will come back
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Old 11th January 2011, 07:59 AM   #5737
Salas is offline Salas  Greece
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I think that 56dB has chance to fill out well with that cart when stereo. Let us know.
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Old 18th January 2011, 11:42 AM   #5738
mhouston is offline mhouston  Australia
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Default Boozhoundlabs - Le Pacific

I built this because I though the JAN6418 and OPAMP based phono preamps I was using were not giving me the best. This is a huge improvement over the other two.

Constructed on vero-brd. (strip brd.) with all polypropelene capacitors and metal film Rs. Low ESR storage caps (snubbed) and a 10,000uf cap (also snubbed) across the PS fed from a 1ohm 5W R.

Silver solder and wirewrap wire for hookup wire with ferrite beads on all input wires and PS leads. Housed in an embossed gold chocolate box with bitumanised Al foil lining. Currently powered from 3 X 9V lithiums. And sounds absoluty excellent.

This is the boozhoundlabs version of Le Pacific. I like the way he de-couples the PS V+ rail with 10ohm Rs and (in my build) 220uf low ESR caps (snubbed) at each end of the de-coupled rail.
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File Type: jpg jFETPhonopreampss.jpg (149.6 KB, 305 views)
File Type: jpg jFETPhonopreamp2ss.jpg (121.5 KB, 291 views)
File Type: jpg jFETPhonopreamp4ss.jpg (101.9 KB, 294 views)

Last edited by mhouston; 18th January 2011 at 11:45 AM.
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Old 18th January 2011, 12:19 PM   #5739
Salas is offline Salas  Greece
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Congratulations. That's closer to a Mad's than to the Simplistic though. Rg first stage makes it noisier than a Mad's too.
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Old 18th January 2011, 12:59 PM   #5740
RCruz is offline RCruz  Switzerland
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Hi Salas

should I add a varistor in the input mains just for protection ?

Does the varistor remove switch on thump ?

I have some 10w 420v VDR that I believe could be used in parallel with the input mains.

Hi mhouston.... Would you post the boozhoundlabs schematic ?
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