The discrete opamps are mounted on a daughterboard with its own power supply filtering running at +-18V. The unit has just been gone through and given a thorough cleaning and all the Lorlin switches and pots have been cleaned and re-lubed. Not to be confused with the PA-2, this is a very different preamp with input transformers and both12AX7 and EF86 stages running full plate voltage. The EF86's in the unit are a matched pair of Svetlana's(Winged C's) and the 12AX7's are a matched pair of Yugoslavian Ei(orginal, not re-issue) tubes branded as Edicrol. This preamp sounds better to my ears then my Demeter VTMP tube preamp and is very much in the league of Avalon, DW Fern, A Designs, and the aforementioned Summit Audio.
The item "TL Audio PA-1 Dual Pentode Tube Stereo Microphone Preamp Modded API 2520 Opamps" is in sale since Friday, August 6, 2021. This item is in the category "Musical Instruments & Gear\Pro Audio Equipment\Preamps & Channel Strips". The seller is "pitch-bend" and is located in Meridian, Idaho. This item can be shipped to United States, Canada, United Kingdom, China, Mexico, Germany, Japan, France, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Greece, Portugal, Cyprus, Slovenia, Sweden, South Korea, Indonesia, Taiwan, Thailand, Belgium, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Austria, Israel, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Bangladesh, Bermuda, Brunei darussalam, Guernsey, Gibraltar, Iceland, Jersey, Jordan, Cambodia, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Maldives, Oman, Pakistan.