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DB - Two-Channel Tube Mic Preamp with DI - Hand-Built
Old 16th October 2017
  #1
DB Vacuum Tube Microphone Preamplifier - Two-channels with DI - $1999.99 Introductory


An entire year of research and design led to the product you see here.
It would have been selfish to build just one for myself, so I am offering a limited run of this two-channel tube preamp. It is available to anyone who wants a classic transformer balanced tube preamp, with high quality components and useful features, at an affordable price.

The DB Vacuum Tube Microphone Preamplifier is a classic transformer balanced tube microphone preamp with instrument DI. Features 63 dB of selectable gain, +48V Phantom Power, -20 dB PAD, phase reverse, and two custom switchable low shelf filters. The circuit includes special components such as Jensen transformers, paper-in-oil coupling capacitors, stepped gain attenuators, and NOS General Electric and Telefunken tubes from the 1960s.



The preamp’s key components are not easily found in modern production models. I tested numerous combinations of transformers, tubes, and coupling capacitors before deciding on the final tonal characteristics that sounded best to me.


Matched pairs of 1960s new-old-stock General Electric and Telefunken tubes meet or exceed published specifications of transconductance. The GE 5-Star 6072a is legendary for its larger-than-life 3D quality, while the Telefunken contributes its hi-fi soundstage, tight bass, and neutral highs.


Jensen has led in transformer research for decades. Their JT115k input transformer is designed for the highest practical 1:10 step-up ratio within their company’s design tolerances. This is a perfect transformer for a tube preamp.


Glass-sealed Russian paper-in-oil and Teflon bypass capacitors are used for coupling following tube gain stages. Polypropylene film and electrolytic caps are used elsewhere in the audio and PSU circuits.


High quality stepped-gain rotary switches are used instead of potentiometers for repeatable gain selection and to help maintain signal integrity.

Features
• 63 dB Gain
• XLR Inputs/Outputs
• 1/4" Instrument Input
• -20 dB PAD
• +48V Phantom Power
• Ø Polarity Switch
• Low Shelving Filters
• Rear Panel Grounding Lug
• 120 VAC IEC Fused Power

Carefully-Selected Components
• Jensen Input Transformers
• Edcor Output Transformers
• NOS General Electric 6072a
• NOS Telefunken ECC82
• Paper-in-Oil Coupling Capacitors
• Teflon Bypass Capacitors
• Stepped Attenuators
• DC Heater Supply
• Toroidal Power Transformer
• Turret Board Construction

Specifications
• 20Hz-20kHz (+/- 0.2 dB)
• Noise EIN: -120dB (+/- 4 dB)
• Input Impedance 1.5k ohms
• Output Balanced 600 ohms
• Low Shelf POS 1: Flat
• Low Shelf POS 2: -3dB at 75Hz
• Low Shelf POS 3: -3dB at 275Hz
• Dim (3U): 19" W x 5.25" H x 11" D
• Weight: 18.2 lb


This unit is being offered at an introductory price of only $1,999.99 USD.

[SPECIAL OFFER] Make a $1,000 DOWN PAYMENT today, and pay the remaining balance in a few weeks prior to shipping.


Visit https://dansmusiconline.com/pro-audio for more info and to place an order. Allow 4-6 weeks for build and delivery.


Last edited by BluegrassDan; 19th October 2017 at 02:55 AM..
Old 16th October 2017
  #2
WOW niiiiiice!!!
Old 16th October 2017
  #3
Lives for gear
 
elambo's Avatar
Looks nice!
Old 18th October 2017
  #4
Audio Samples

Here is an audio sample of this preamp used on all sources. This original song will be released this holiday season.

One amazing thing about this preamp is how smooth the high end is. You can easily add sparkle up top without ever sounding grainy or harsh.

Enjoy this old-time, four-part vocal bluegrass Christmas number!

Old 18th October 2017
  #5
Lives for gear
 
gutr2's Avatar
 

The track sounds amazing! I wish I had $2k - congratulations on the release
Old 19th October 2017
  #6
Anyone who doesn't have the full amount on them may opt for the TWO PAYMENTS option. A down payment of $1,000 is all that is required to ensure your place in line!

You can pay off the rest in a few weeks after you save the $$$.

Check out the website for more details. https://dansmusiconline.com/pro-audio
Old 22nd October 2017
  #7
Lives for gear
 
the fxs's Avatar
 

Quote:
Originally Posted by BluegrassDan View Post
Here is an audio sample of this preamp used on all sources.
damn!
that sounds sweet.

congratulations, looks like you've got a solid product right there.
Old 23rd October 2017
  #8
Lives for gear
 
brucerothwell's Avatar
 

Quote:
Originally Posted by BluegrassDan View Post
Here is an audio sample of this preamp used on all sources. This original song will be released this holiday season.

One amazing thing about this preamp is how smooth the high end is. You can easily add sparkle up top without ever sounding grainy or harsh.

Enjoy this old-time, four-part vocal bluegrass Christmas number!

That is impressive.

I am especially curious what you did to get the bass vocal sounding so great!
Old 25th October 2017
  #9
It's a bass singer through Flea 47, my preamp, La2a, and that's it.

He's a good singer!
Old 25th October 2017
  #10
Gear Addict
 
Jess Jackson's Avatar
nice clean point to point work bro
Old 27th November 2017
  #11
Lives for gear
 
razorboy's Avatar
 

"This unit is being offered at an introductory price of only $1,999.99 USD. "

"$1,999.99" ???????????

Wouldn't it be rather easier to type '$2,000'?"
Old 28th November 2017
  #12
Old 10th December 2017
  #13
Lives for gear
Any chance of a mono channel.
Old 12th December 2017
  #14
Quote:
Originally Posted by miscend View Post
Any chance of a mono channel.
I've been thinking about it.
Old 25th December 2017
  #15
Hey gear heads!

Here is the latest promo video we just shot this week. All tracks were recorded and mixed with no eq or compression. Everything is running through my preamps.

Here is the Pro Tools 12 session for anyone who would like to hear the original files and play around with mixing it: Driving Nails in My Coffin

Enjoy!

Old 24th April 2018
  #16
Here for the gear
 

Old 31st July 2019
  #17
Gear Addict
 

How did you end up with the Edcor output transformers versus Jensen or similar?
Old 6th August 2019
  #18
Quote:
Originally Posted by ivanc View Post
How did you end up with the Edcor output transformers versus Jensen or similar?

The Jensen output transformers are far better than the Edcors in every way. That's what I've settled on.
Old 4 weeks ago
  #19
Lives for gear
 
deuc647's Avatar
Am I gonna be the first gearslutz with this preamp?!!!
Old 4 weeks ago
  #20
You might be!

Finished your turret boards about an hour ago.
Attached Thumbnails
DB - Two-Channel Tube Mic Preamp with DI - Hand-Built-photo-aug-14-6-36-26-pm.jpg  
Old 4 weeks ago
  #21
Lives for gear
 
deuc647's Avatar
Quote:
Originally Posted by BluegrassDan View Post
You might be!

Finished your turret boards about an hour ago.
Really excited about this Dan!
Old 4 weeks ago
  #22
Glad you’re excited!

Here are the finished stepped gain attenuators.
Attached Thumbnails
DB - Two-Channel Tube Mic Preamp with DI - Hand-Built-ac6641f5-7de5-4ff6-a242-a9fc675fafbc.jpg  
Old 4 weeks ago
  #23
Lives for gear
 
deuc647's Avatar
Quote:
Originally Posted by BluegrassDan View Post
Glad you’re excited!

Here are the finished stepped gain attenuators.
If this is as good as I think, I might have to grab a 4 channel version in the near future Dan, thanks a million.
Old 4 weeks ago
  #24
A lonely trim pot waiting for his friends to arrive.
Attached Thumbnails
DB - Two-Channel Tube Mic Preamp with DI - Hand-Built-caa5c748-4f51-4e6b-b26f-8c4b9f7e3d83.jpg  
Old 4 weeks ago
  #25
Lives for gear
 
deuc647's Avatar
Quote:
Originally Posted by BluegrassDan View Post
A lonely trim pot waiting for his friends to arrive.
Old 4 weeks ago
  #26
PSU completed.
Attached Thumbnails
DB - Two-Channel Tube Mic Preamp with DI - Hand-Built-beaf7567-a766-40ee-86b5-60fccef0312c.jpg  
Old 3 weeks ago
  #27
Lives for gear
 
deuc647's Avatar
Quote:
Originally Posted by BluegrassDan View Post
PSU completed.
I wish i had ur point to point skills.
Old 3 weeks ago
  #28
Lives for gear
Very nice. Good luck with it. About two years too late for me.

I went with this:
https://www.locomotiveaudio.com/286a

If I was shopping 3 months ago, I would have gone with this:
2x COIL AUDIO CA-70S
and 2X ZOD DI
Old 3 weeks ago
  #29
I met Eric of Locomotive at NAMM last month. His work is beautiful!
Old 3 weeks ago
  #30
Lives for gear
 
deuc647's Avatar
Quote:
Originally Posted by elegentdrum View Post
Very nice. Good luck with it. About two years too late for me.

I went with this:
https://www.locomotiveaudio.com/286a

If I was shopping 3 months ago, I would have gone with this:
2x COIL AUDIO CA-70S
and 2X ZOD DI
Thats 4800. Plus im always the person to go with the not so known choice. Reason i have the first Qes Labs converter and the BLA modded HD I/O. This preamp fits everything im about
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