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Old 25th May 2002, 04:21 AM   #1
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Talking balanced stereo tube preamp for a recording studio

Hello folks
I would like to build a high quality stereo tube preamp with balanced ins and outs for my recording studio. Please note that I am a newbie in diy audio. Does anyone has any suggestions? Thanks in advance!
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Old 25th May 2002, 04:51 AM   #2
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Default Re: balanced stereo tube preamp for a recording studio

Quote:
Originally posted by zdpinet
I would like to build a high quality stereo tube preamp with balanced ins and outs for my recording studio. Please note that I am a newbie in diy audio. Does anyone has any suggestions? Thanks in advance!
You could look at the mic pre version of Allen Wright's RTP available as a kit, or described in detail in his PreAmp Cookbook.

dave
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Old 26th May 2002, 04:20 AM   #3
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thanks, Planet 10. I will check that out.
Did you have a chance to browse at lenght trough the preamp-cookbook? Is there any other books that you could recommend? I am also interested in parametric EQs and compressors.
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Old 26th May 2002, 04:35 AM   #4
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Quote:
Originally posted by zdpinet
Did you have a chance to browse at lenght trough the preamp-cookbook?
Read thru completely twice and keep going back & reading certain bits.

dave
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Old 26th May 2002, 04:50 AM   #5
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zdpinet

I'd made a note to reply to your original post and mention the vacuumstate RTP's, but Dave posted whilst I was off making dinner. I second the motion.

If you get a chance to read the TPCB, do. It's got a lot of valuable information in it, and it's damn funny in places to boot.

As for the RTP sonics, I'll let you know in a few weeks when mine's finished.
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Old 31st May 2002, 04:26 AM   #6
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Hi there!
Thanks so much for the info. I will order the preamp cookbook asap! !
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Old 3rd June 2002, 06:55 PM   #7
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Default Tube Mic preamp

See also AudioXpress Feb/Mar 2002 for a design by Paul J. Stamler. It certainly seems thorough, and it's not cheap. Good discussions of the design decisions.

They also published a 2-channel tube compressor design in July, 2001.

www.audioxpress.com
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Old 24th June 2002, 07:28 AM   #8
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Default RTP

I am also building RTP 5 rev 1 as well.

http://www.vacuumstate.com/images/RTP5_rev_1.GIF

http://www.vacuumstate.com/images/RTP5_rev_1.GIF

I wonder what is the value of R2.
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Old 24th June 2002, 08:58 AM   #9
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<b>WT

I am also building RTP 5 rev 1 as well.</b>

Cool. It's about time other people started to build these too. I was beginning to feel lonely.

<b>I wonder what is the value of R2.</b>

I have 1200 ohms for it.

I ordered the last parts for mine today, so knowing how slow I am, I'd anticipate 4-6 weeks after they get here, and I'll have an RTP3C/5 and a pair of PP1Cs.
Let me know how you go.

Cheers
Brett
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Old 25th June 2002, 04:31 AM   #10
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Default RTP

I have 1K for R2 at the moment. Will change to 1.2K to see how change. I will need to adjust the B+ and negative supply since it gain is really low at the moment.

What do you use for current source? Mosfet? I am using LM317 since I am lazy.

WT
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