Ribbon Microphone MOD - LL2913 & Foil

Lundahl LL2913 + PC board and either one sheet of 1.8µ or 2.5µ aluminum foil.

Kit Contents

  • Lundahl LL2913 with PC board.
  • 1 sheet of either 1.8µ or 2.5µ aluminum foil.
IF YOU DO NOT SPECIFY THE THICKNESS OF FOIL YOU REQUIRE, WE WILL SHIP 2.5µ.

Specifications For Lundahl LL2913

  • Turns ratio: 1 + 1 + 1 + 1 : 37

Specifications For 1.8 micron Aluminum Foil Sheet

  • Thickness: 1.8µ (.00018 cm, .0018 mm, .000072 inches)
  • Width: 7 cm (70 mm, 2.755910 inches) ***
  • Length: 10.5 cm (105 mm, 4.133858 inches) ***
  • Area (squared): 73.5 cm^2 (7350 mm^2, 11.392540 inches^2)
  • Material: 99.1% Aluminum

Specifications For 2.5 micron Aluminum Foil Sheet

  • Thickness: 2.5µ (.00025 cm, .0025 mm, .000098 inches)
  • Width: 6.25 cm (62.5 mm, 2.46063 inches) ***
  • Length: 12.5 cm (125 mm, 4.92126 inches) ***
  • Area (squared): 78.125 cm^2 (7812.5 mm^2, 12.10939 inches^2)
  • Material: 99.1% Aluminum

***Tolerances: +/- 2 mm

HANDLE WITH CARE. We are not responsible for the foil once you start handling it. The smallest burst of air can flip the foil over, bend it, or tear it. If you fold the material on accident you can smooth it out easily by putting it back in the tracing paper and running your fingers over the tracing paper until it is flat again

Tips

  • Use a cutting mat not a cutting board. You can find on amazon or a local hobby store.
  • Make sure to clean the mat of debris to keep your cut nice and straight.
  • Use a very sharp cutting tool (exacto).
  • Cut slow and steady. Avoid starting and stopping.
  • We like to keep the foil between the two sheets of tracing paper when cutting it to the desired width. This will help to avoid tear out on the edges. Buy some extra tracing paper to store the foil because every time you make a cut you will also cut the tracing paper and eventually run out of the supplied tracing paper.
  • Use a flat ruler as a guide and apply enough pressure so the material doesn't move on you. 
  • Cut the ribbon to an over sized length. We like to cut a piece the entire length (longest dimension) of the raw material to make sure we can handle and install the ribbon properly.
  • Have patience. It takes some practice. Try practicing on regular foil first to see how the material responds to cutting. You can also buy some 0.3µ-0.6µ imitation silver leaf to practice on. If you can cut this you will have NO PROBLEM cutting a thicker foil.

Packaging 
We package the material between two pieces of acid free tracing paper. The material and tracing paper is then sandwiched between two pieces of thick poster board.
Domestic Shipping 
The kit will ship USPS priority mail. 
International Shipping 
The kit will ship USPS international priority mail.
Returns 
Returns are accepted within 14 days after you receive the kit.
International Buyers – Please Note: 
Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyer's responsibility. Please check with your country's customs office to determine what these additional costs will be prior to bidding or buying.