Hi, I am hoping that someone out there can help me.
I am trying to find plans and gather info. on building a tube phono preamp with a gain control that will accomodate mm and mc cartridges .
I have a friend who will be able to build it for me, if, I can find plans and get some helpful tips and information.
I will be very grateful for any help in this matter.
Thank you, Tom
I am trying to find plans and gather info. on building a tube phono preamp with a gain control that will accomodate mm and mc cartridges .
I have a friend who will be able to build it for me, if, I can find plans and get some helpful tips and information.
I will be very grateful for any help in this matter.
Thank you, Tom
RIAA preamp
IMHO, I think that you would be better to make a RIAA preamp from transistors or IC's rather than tubes. The preamp would have to raise a signal of about 4mV up to 400mV, that's a huge gain for a tube, or cascaded tubes without increasing S/N ratio, distortion etc. There are stacks of designs available
Cheers.. Steve
IMHO, I think that you would be better to make a RIAA preamp from transistors or IC's rather than tubes. The preamp would have to raise a signal of about 4mV up to 400mV, that's a huge gain for a tube, or cascaded tubes without increasing S/N ratio, distortion etc. There are stacks of designs available
Cheers.. Steve
A tube preamp for MC without a transformer is hard to do as the input levels are so low. Another option is to use a transistor as the first gain stage.
However if you can pick up a copy of "HiFi Amplifier Circuits" by Rodenhuis (published by Philips in 1960) there are a couple of good circuits using EF86 and ECC83 in that plus much more info on valve stuff.
However if you can pick up a copy of "HiFi Amplifier Circuits" by Rodenhuis (published by Philips in 1960) there are a couple of good circuits using EF86 and ECC83 in that plus much more info on valve stuff.
Thank you guys for your help. I have been scouring the internet for as much info. as I can get my hands on and have been able to come up with a few ideas.
Does anyone have a good phono preamp design that is tried and true, they could share, along with a parts list and possibly some helpful tips or directions for building it?
Oh yes, and pics?
Tom
Does anyone have a good phono preamp design that is tried and true, they could share, along with a parts list and possibly some helpful tips or directions for building it?
Oh yes, and pics?
Tom
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