This is my first post an I'm hoping my query will not be futile. I'm searching for someone that can create a schematic for a phono stage that I might hand off to a friend that has considerable build experience. (I have none but hope to remedy this soon).
The details are as follows:
*Two gain stages (both based on Siemens C3g)
*LCR networks based in double T filter
(2123Hz pole formed by air core inductor at the first gain stage)
(50-500Hz poles are formed in high signal level directly at the output of the second gain stage)
*somehow the first gain stage is decoupled from the 2123 pole coils
*Passive LCR RIAA
*Power supply rectified by EZ81 and a choke filter
*Tube heaters are DC passive regulated (?) for the first stage and AC in the second stage
I make no apologies that this is an attempt at copying a phono stage that costs thousands of dollars. I don't make a habit of theft but I see no way of obtaining this audio goal unless I can DIY. Please help if you can.
Many thanks in advance for your kindness and generosity.
I believe many can benefit from the shared advice.
I also welcome any advice and guidance anyone can give.
2 stage C3g LCR RIAA build...schematics please
2 stage C3g LCR RIAA build...schematics please
Last edited by rob3rt5 on Mon Feb 22, 2016 7:44 pm, edited 1 time in total.
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Hey,
I'm not sure futile is the right word but what you ask is not a small task and would require a lot of work which would require some form of compensation for a person to undertake.
My plate is full at this point but maybe someone else will jump in.
dave
I'm not sure futile is the right word but what you ask is not a small task and would require a lot of work which would require some form of compensation for a person to undertake.
My plate is full at this point but maybe someone else will jump in.
dave
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There are some design points in there that seem a bit strange and/or limiting, like the EZ81 rectifier. By "choke filter" you mean a choke input filter? At least I hope so.
Why do you want to heat the input stage with DC and the output with AC?
I recommend you contact Thomas Mayer (www.vinylsavor.com) and get one of his LCR RIAA kits. There's a good change you will get something better than what you are trying to copy.
Why do you want to heat the input stage with DC and the output with AC?
I recommend you contact Thomas Mayer (www.vinylsavor.com) and get one of his LCR RIAA kits. There's a good change you will get something better than what you are trying to copy.