Here is one used pair of the famous Stevens & Billington (S & B) Model EQ600 600 Ohm LCR RIAA Phono Equalizer Modules. I purchased these two Model EQ600s from S & B in 2012, and I used them with great success for many years in an LCR phono preamp of my own design. They are in perfect operating condition, and were never abused. The EQ600 is based electrically upon the classic and well-known Tango EQ-600P 600 ohm LCR Phono RIAA equalizer module, and S & B EQ600s are now rare and very difficult to find, as most users keep them and do not offer them for sale. They are in the same perfect cosmetic and physical condition as the day I had received them from S & B. The large clamps used for mounting these modules are included, as is the original S & B instruction manual (see photos) that was shipped with them. The S & B EQ600s are packaged in a Mu-metal shielded can that measures 60.25mm (2-3/8”) in diameter, and 72mm (2-13/16”) in height. The EQ600 was used in the famous Thorsten Loesch LCR Phono Preamplifier that many high-end audio enthusiasts around the world had built with great success. Most thought it was the finest sounding phono preamplifier they had ever heard. You are purchasing one pair of these S & B EQ600 LCR modules for one price. As with all electronic equipment of this vintage, this item is sold as-is and with no warranty. Please look at the accompanying photos carefully; what you see is what you will receive, and feel free to e-mail me with any questions you may have! Be sure to see the many buyer positive feedback comments I have received as a seller here on e-Bay. Bid with complete confidence, as I have 100% perfect positive feedback, and I have been a member of e-Bay since 1999! This sale is for one used pair of the Stevens & Billington (S & B) Model EQ600 600 Ohm LCR RIAA Phono Equalizer Modules, as described above and pictured herein. They will be very carefully double-boxed and packed for shipment; I have an extremely good reputation for safe and careful packing of delicate electronic equipment. Be sure to see my feedback for many buyer positive comments about my packing quality. Shipping costs are always quoted at the actual cost, and there is no handling charge or any charge for the packing materials. A word about shipping costs: I always endeavor to ship items offered for sale here on eBay by the most economical means, consistent with good packing practices, while considering the size, weight, and value of the item. Good packing practice means I will not pack a delicate item in an undersized box and with insufficient packing/filler material so the item may ship the most inexpensive way, such as via USPS Flat Rate Small Box Priority Mail. We both want your item to arrive safely, and with minimal chance of damage in shipment. I have no control over the shipping cost to you via the USPS or any other carrier. I never make a profit on the shipping cost, and there is never a charge for any packing materials, which usually includes brand-new bubble-wrap. If you are of the opinion the shipping cost quoted by the eBay shipping calculator may be too high, please contact me before you place your order, so we can discuss a possible alternate means of shipment that may be less costly. Positive feedback is left automatically, once the buyer leaves positive feedback for this transaction.