Hello Salas
I need an advice from you. At first I like to buy the 2SK170 for matching. Should I buy the BL or V version ? I'm using the EMT TSD15 with the specification which I found:
the load should be 150 - 200 Ohm and output is 0,15mV. So I think I need about 60dB.
Thanks Kurt
PS: I did not found the answers in your excellent thread.
I need an advice from you. At first I like to buy the 2SK170 for matching. Should I buy the BL or V version ? I'm using the EMT TSD15 with the specification which I found:
the load should be 150 - 200 Ohm and output is 0,15mV. So I think I need about 60dB.
Thanks Kurt
PS: I did not found the answers in your excellent thread.
Hello
Maybe 0.21mV? EMT TSD 15
Interesting thread about loading it http://www.diyaudio.com/forums/analogue-source/63086-tsd-15-optimum-loading.html
There is only one Simplistic made with V grade 15mA IDSS, actually by a fellow countryman and hobbyist of yours. Franz, maybe you know him?
You can try make that circuit I suppose. http://www.diyaudio.com/forums/analogue-source/129126-simplistic-njfet-riaa-384.html
Maybe Franz can tell you more about practical stuff like how he laid it out since he has very sensitive speakers and got no hum as he reported.
Maybe 0.21mV? EMT TSD 15
Interesting thread about loading it http://www.diyaudio.com/forums/analogue-source/63086-tsd-15-optimum-loading.html
There is only one Simplistic made with V grade 15mA IDSS, actually by a fellow countryman and hobbyist of yours. Franz, maybe you know him?
You can try make that circuit I suppose. http://www.diyaudio.com/forums/analogue-source/129126-simplistic-njfet-riaa-384.html
Maybe Franz can tell you more about practical stuff like how he laid it out since he has very sensitive speakers and got no hum as he reported.
Salas,
They were 200B K72.
For the record a 100nF decoupling cap is a requirement in this confuguration. I wish I did a distortion plot vs. frequency before to compare. I will do it at some point.
The speakers have completely dissappeared and the soundstage blew open to put it mildly. High frequency high energy like cymbals have taken on a very real presentation.
They were 200B K72.
For the record a 100nF decoupling cap is a requirement in this confuguration. I wish I did a distortion plot vs. frequency before to compare. I will do it at some point.
The speakers have completely dissappeared and the soundstage blew open to put it mildly. High frequency high energy like cymbals have taken on a very real presentation.
Kurt could test my preamp in his home.
Thats why he wants to build one
Franz
Nice, he has sure chance of debugging success since he knows you then.
Hmm...
He will not need it, as he was working a long time for the swiss distributor of Quad. I think, he repaired a lot of the Quad devices.
Franz
Salas
Thanks for your information.
1. I get my EMT TSD15 specification from this (bad) copy of "EMT Technische Information" Pegel bei 1kHz (Spitzenschnelle = 1cm/s) = 0,15mV +/- 2dB : http://www.stefanopasini.it/EMT_TSD_15_Brochure-0.htm
2. So, then I will buy the V version
3. Yes I know Franz
Regards
Kurt
Thanks for your information.
1. I get my EMT TSD15 specification from this (bad) copy of "EMT Technische Information" Pegel bei 1kHz (Spitzenschnelle = 1cm/s) = 0,15mV +/- 2dB : http://www.stefanopasini.it/EMT_TSD_15_Brochure-0.htm
2. So, then I will buy the V version
3. Yes I know Franz
Regards
Kurt
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Salas
Thanks for your information, but it will take some time, because I'm a very slow DIY.
Now I have to wait at first to get the 2SK170V.
Regards
Kurt
Last edited:
Thanks for the words S Gregory.
Well, the Hamond is the first choque in a triple PI configuration for the WE417 B+ voltage, the others are 6! Lundahl choques that are positioned on the top of the chassis for extra filtering both 300B voltage and WE417.
The rest of the iron is Hashimoto interstages and outputs, in conjuction with Emission Labs valves, it sounds wonderfull on OB speakers using Lowther PM2 and Tone Tuby Bass.
Good luck with your projects.
cheers.
Well, the Hamond is the first choque in a triple PI configuration for the WE417 B+ voltage, the others are 6! Lundahl choques that are positioned on the top of the chassis for extra filtering both 300B voltage and WE417.
The rest of the iron is Hashimoto interstages and outputs, in conjuction with Emission Labs valves, it sounds wonderfull on OB speakers using Lowther PM2 and Tone Tuby Bass.
Good luck with your projects.
cheers.
GR's or BL's ?
Hello Salas,
I have mixed news but I still want to jump in with both feet. Today I received 250 2SK170GR’s from Bangkok Thailand. I thought that they were going to be BL’s. They are not.
This journey is about learning to use JFET’s and measurement software. I hope the GR’s will work. I thought I would ask before I start to sort by current.
My cart is a Ortofon OMB 10. My present RIAA preamplifier has about 40db of gain it feeds into a buffer line stage followed by a stepped attenuator and followed by 6BQ6GTB tubes with 5000 : 300 output transformers. This plays into Sennheiser HD600’s headphones. There is about 20db of headroom on the attenuator at a comfort listening level.
Should I keep shopping for BL’s? Or look for highish pairs from the GR’s?
Thanks
DT
All just for fun!
Hello Salas,
I have mixed news but I still want to jump in with both feet. Today I received 250 2SK170GR’s from Bangkok Thailand. I thought that they were going to be BL’s. They are not.
This journey is about learning to use JFET’s and measurement software. I hope the GR’s will work. I thought I would ask before I start to sort by current.
My cart is a Ortofon OMB 10. My present RIAA preamplifier has about 40db of gain it feeds into a buffer line stage followed by a stepped attenuator and followed by 6BQ6GTB tubes with 5000 : 300 output transformers. This plays into Sennheiser HD600’s headphones. There is about 20db of headroom on the attenuator at a comfort listening level.
Should I keep shopping for BL’s? Or look for highish pairs from the GR’s?
Thanks
DT
All just for fun!
If they are genuine items we can design for GR when not looking for top gain and MM lends for that. Try your hand on this one. Use an LM317 reg firstly just to see if the FETs behave as expected for gain & low noise. The 100k input load trimmer connected as a rheostat will let you calibrate tone, since the omnipresent 47k load for MM is a myth.
