Let us know your progress, cheers.
Salas,
That is a good evolution for me, because I can build the pre-pre first and test it against my current phono pre, then move on to the MC pre.
Thanks,
Vince
That is a good evolution for me, because I can build the pre-pre first and test it against my current phono pre, then move on to the MC pre.
Thanks,
Vince
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I'll be measuring and matching them as my meter can measure capacitance. I intend to match the 5% Teflons up using low-value polystyrenes. Hopefully the Teflons will be here in the next couple of days so I can get on with the build.
I have just read the pdf on the HiMM (great info by the way) and need to check with you about matching the fets.
In the range 8 to 8.5mA:
I have 4 at 8.4mA. So these could be Q1 and Q2 (two for each channel).
I also have 2 at 8.3mA. So these could be Q3.
Finally I have 2 at 8.2mA. These could be Q5.
Have I understood correctly?
In the range 8 to 8.5mA:
I have 4 at 8.4mA. So these could be Q1 and Q2 (two for each channel).
I also have 2 at 8.3mA. So these could be Q3.
Finally I have 2 at 8.2mA. These could be Q5.
Have I understood correctly?
Not a bad plan. Although the complete Simplistic is the business in the end of the day, you can go step by step at your leisure. There is a pre-pre thread also where you can get ideas, as some members had built it on its own too.
http://www.diyaudio.com/forums/analogue-source/188730-2sk170-bl-mc-step-up-amp.html
Listening fun! And... any more gain?
Just a note to say thanks again Salas. I've been listening, listening and listening. Got me hunting for vinyl now!😀 Must have picked up 50 LP's in the past 2 months. I can really hear the dynamics of some recordings now. Just listening to Earth Wind and Fire- Praise. It really came alive! Donald Fagen's recordings are also quite lively. Others sound a bit dead by comparison.
One day, I'll get the Salas RIAA in a box!
One question- Is there any way to get a few more db out of the circuit, apart from adding source bypass caps? I built the MC RIAA 8-8.5 idss from your Document version 11.02.F0.
I do have some more matched jfets in the 8.5-10mA idss range. Though I gather the RIAA values would need to recalculated.
If hard to do, I'll leave as-is. I just like running straight w/o a line amp, but could go that route if needed.
Anyway, big thanks again from Berkeley, CA! You got me back into vinyl! 😀
-Kent
Just a note to say thanks again Salas. I've been listening, listening and listening. Got me hunting for vinyl now!😀 Must have picked up 50 LP's in the past 2 months. I can really hear the dynamics of some recordings now. Just listening to Earth Wind and Fire- Praise. It really came alive! Donald Fagen's recordings are also quite lively. Others sound a bit dead by comparison.
One day, I'll get the Salas RIAA in a box!
One question- Is there any way to get a few more db out of the circuit, apart from adding source bypass caps? I built the MC RIAA 8-8.5 idss from your Document version 11.02.F0.
I do have some more matched jfets in the 8.5-10mA idss range. Though I gather the RIAA values would need to recalculated.
If hard to do, I'll leave as-is. I just like running straight w/o a line amp, but could go that route if needed.
Anyway, big thanks again from Berkeley, CA! You got me back into vinyl! 😀
-Kent
Cheers Kent. With the parts quality you used and fine p2p workmanship its a pity to mod it. Use Sowter 9395 autoformer attenuator and utilize its +6 dB gain tap. Two birds with one stone. Best than any resistive pot and your gain there. Has a +12dB gain tap even.
I want to increase the gain +6 dBs, I'm using this schematic without C10 so instead 63dBs I have 57dBs, wich one will be a better solution:
-Partridge 977 1:6 15dBs step up, what I have to do about load resistor? I have to take of 150R from Simplistic & adding a resistor at the ouput of the step up, I don't know how calculate?
-Salas active pre-pre 1:10 20dBs, I don't know hows but I think it need to be modified because will be connected to MC instead a MM and also is the load resistor, I don't know how calculate?
-Make a new active pre-pre for only +6 dBs?
-Using Sowter 9395 autoformer attenuator and utilize its +6 dB gain tap as suggested to Kent?
-Partridge 977 1:6 15dBs step up, what I have to do about load resistor? I have to take of 150R from Simplistic & adding a resistor at the ouput of the step up, I don't know how calculate?
-Salas active pre-pre 1:10 20dBs, I don't know hows but I think it need to be modified because will be connected to MC instead a MM and also is the load resistor, I don't know how calculate?
-Make a new active pre-pre for only +6 dBs?
-Using Sowter 9395 autoformer attenuator and utilize its +6 dB gain tap as suggested to Kent?
Attachments
What I suggested to Kent was for output volume control straight to his amp along with gain at output. Useless at input side.
For 63dB you make the pre-pre and himc chained together. No individual circuit or pre-pre to 57dB matches. Unless you can compromise to a capacitor bypass on the one you already got.
For 63dB you make the pre-pre and himc chained together. No individual circuit or pre-pre to 57dB matches. Unless you can compromise to a capacitor bypass on the one you already got.
Can you measure their real secondary value on 230V mains? Want to know for another project. Thanks.
Thanks Salas and Merlin for the info.
At £134.33 each for the Sowter 9395, it's a bit rich for my frugal budget. It would be a nice all-in-one solution though.
I was going to use the Lightspeed LDR attenuator, as I already have built it.
I will try the 1000u source bypass cap across R2 on Q1 and see how it changes the sound.. I'll need to get a Simlic or Muse at that value.
Cheers- Kent
At £134.33 each for the Sowter 9395, it's a bit rich for my frugal budget. It would be a nice all-in-one solution though.
I was going to use the Lightspeed LDR attenuator, as I already have built it.
I will try the 1000u source bypass cap across R2 on Q1 and see how it changes the sound.. I'll need to get a Simlic or Muse at that value.
Cheers- Kent