0% up to 48 Months on over 110 Brands!

New & Current Vintage King Card Holders

Shop Our Summer Sale

0% financing up to 48 Months on over 110 Brands!

When you shop now with your Vintage King Credit Card.

On Sale!
$ 1,840 .00
You Save: $559.00
Regular: $ 2,399 .00
No interest if paid in full within 6 months Learn more
In Stock
Item is in stock and will ship the next business day. To inquire if this item is available to ship sooner or is in one of our stores, please call 888.653.1184.



Crucial Audio Studio-Nugget Vacuum Tube Prime Number Analog Delay

Rack-mount vacuum tube prime number BBD analog delay with dual analog clocks @1ms resolution range from 61 – 614 milliseconds

MFR# Studio Nugget

Product Description

Upgrade your sound system with The Crucial Audio Studio-Nugget Vacuum Tube Analog Delay. Amazing tape-like pure analog tonality, and a feature set that will blow your mind. Enter Crucial Audio’s world famous analog delay (BBD) circuitry driven by transformer-coupled Class A vacuum tube preamp stages. Prime Number and Tempo Indicators and an analog VU meter guide you towards the ultimate echoes and sonic excellence for your mix! Hand-built to order by Crucial Audio.

Prime Numbers and Delay Times

Legendary producer and recording industry icon Rob Fraboni was a huge part of the inspiration to develop the Studio-Nugget’s Prime Number Identification algorithm. Professional producers and recording engineers have known that delay times/echoes set to prime numbers deliver a sonic difference in overall echo clarity and level in the mix. It can be an effective technique at any song tempo.

A prime number can only be divided by 1 and itself. Thus less likely to create phase cancellation of the fundamental frequencies during audible intermodulation events. One example is a multi-tone of 250 Hz + 1 kHz Dry and Delayed Sine Waves (summed with delay range of 80 – 120ms) @0 dBv and -10 dBv. Measurements on the Stanford Research Systems SR-760 FFT spectrum analyzer illustrate that a change of 1ms from a prime number can yield as much as -8 dBv in delay gain at the 1 kHz carrier during the 250 Hz intermodulation. Hence the audible difference of reported echo clarity and level within the frequency feast of the mix.


  • LED delay time display with prime number indicators
  • Analog VU meter with selectable input and output monitors
  • Transformer balanced inputs and outputs on XLR connectors (+4 dBu)
  • Low noise high voltage Class A vacuum tube preamps
  • BBD analog delay with dual analog clocks @1ms resolution range from 61 – 614 milliseconds
  • Coarse and fine delay time controls
  • Tempo LED for optical rhythm synchronization
  • Modulation Depth and Rate controls plus Modulation Rate LED
  • Dry Level, Repeats, Delay Level and Tone controls
  • Gold anodized rugged 19" 1U rack-mount enclosure
  • 115/230 Vac 50/60 Hz world wide power input featuring medical-grade power supplies
  • 1-year limited warranty

Product Specifications

Condition New
Tube or Solid State Tube
Channels Single-Channel
Chassis 19-inch Rack-mount
Rack Spaces 1U
Input Connectors Analog XLR
Output Connectors Analog XLR

Product Reviews

No one has written a review yet. Be the first!

* Required Fields

Share Your Opinion

The best gear advice always comes from those who use it the most. That's where you come in! Let the pro audio world hear your voice with a review of the Crucial Audio Studio-Nugget Vacuum Tube Prime Number Analog Delay . Once you submit your review, please check your email and verify your address to have it posted.

How do you rate this product?
I would like to thank VK for the wonderful sales assistance, service and prices. This was my first purchase with you and it won't be my last. I only wish I'd discovered you years ago!
Matthew R.
I had two Grammy wins this year - Ray LaMontagne & Carolina Chocolate Drops. Both made with help from Vintage King!
Ryan F.
In almost 20 years in Pro audio buying, never did I receive a unit so well packed and exactly as described. Works flawlessly. The whole process has been so smooth. I will never hesitate to do business with you guys in the future and will recommend you to everyone I know.
Martin C.
This was my first experience buying something from Vintage King (although I surf the "used" categories on the website frequently!), and, despite being on the other side of the world, I had absolutely no trouble and everything went very smoothly.
Phil T.
The speed of delivery exceeded my expectations! I was VERY pleased that my shipment arrived in time for a scheduled vocal tracking session. The packing insured that my order arrived safely. And the sales staff responded quickly to questions regarding the product.
James P.
Thank you so much! Vintage King has been so fair and easy to work with. I can't thank you enough. It feels good to trust such a hefty purchase to folks who are so helpful and knowledgeable. Vintage King is a sound designers dream store.
Noa L.
You guys have excellent customer service and I am excited about the next upgrade I complete on my fifth recording facility. I've been in the studio business for forty plus years. The salesman I worked with at Vintage King was the best of the best. You all rock!
Robby T.
I would recommend Vintage King to any one looking for top-class gear, unbeatable customer service and the best prices on the map!
Jake D.
My experience with Vintage King was excellent. The order was here fast considering it was out of stock. The sales person had SKB send it to me directly and I couldn't have been more pleased.
Michael D.
From the minute I placed my order I was kept well-informed through each step in your process. Even though I was buying a comparatively modest piece of gear, your attention to detail made me feel like I was purchasing a six-figure mixing desk.
Thomas W.
I am a new customer of yours. You guys provided me the absolute best deals in ordering all the equipment to power my brand new recording studio. Your customer service is amazing and i will always deal with you from here on out.
Rob M.
Thanks for your great service and getting this out today. You guys really are the Kings!
Alan B.
Better than expected! Truly impeccable service. Your team was professional, knowledgeable, provided speedy delivery above and beyond standard. Vintage King Audio is definitely my go to for all of my audio and information needs.
James O.