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Old 9th January 2010, 10:19 PM   #1
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Default Need Info. and Plans

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
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Old 9th January 2010, 10:34 PM   #2
audi0 is offline audi0  Australia
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Default 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
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Old 9th January 2010, 11:00 PM   #3
rjb is offline rjb  New Zealand
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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.
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Old 10th January 2010, 12:25 AM   #4
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The 1st half of this?

Click the image to open in full size.

The FET can be replaced with another 6922 section. Needs a VERY good power supply reg.

dave
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Old 10th January 2010, 02:08 PM   #5
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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
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Old 11th January 2010, 04:20 AM   #6
audi0 is offline audi0  Australia
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Smile RIAA preamp

Hi Tom,

try this: ESP Projects Pages - DIY Audio and Electronics - Preamplifiers

cheers.. Steve
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