Tube Preamplifier
Tube Preamplifier
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 Dynaco PAS 2 Stereo Tube Preamp NR  US $168.50
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 Tube Preamplifier Board With Volume Bass Treble Balance Adjust with Schematic US $68.50
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 CARBON RESISTOR TUBE AMP 51 680 82 150 33K 330 620 100 560 OHM 1 4W 39K 47K F156 US $49.99
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 Tube 6N3 Buffer Audio Preamplifier Pre AMP Kit For DIY US $9.99
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 MOTOROLA SK52 W TUNER TUBE PREAMP HS 823D 9AA60 STEREOPHONIC RECIEVER FIDELITY US $49.99
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 Tube pre amp Audio Line output transformer not Triad Utc US $35.00
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 Tube 6N3 SRPP Preamplifier Kit Buffer Pre AMP For DIY US $24.99
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 Dynakit Model PAS 2 tube preamplifier Dynaco vintage FM tube tuner US $152.50
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 2 Vintage Ampex 350 UTC Peerless Tube Microphone Preamplifier Matched Pair 2 PS US $1,009.99
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 NOS GENALEX GOLD MONARCH B759 12AX7 AUDIO PREAMPLIFIER TUBE 1967 BLACKBURN US $237.50
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 Vintage EICO Tube Pre Amp Amplifier HF 61 High Fidelity Master Control NR US $15.50
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 Mcintosh stereo system C22CE MR77 MC2100 SCR3 all in great working condition US $3,000.00
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 NOS MULLARD 12AU7 ECC82 LONG PLATE AUDIO PREAMPLIFIER TUBE f FISHER SCOTT US $21.05
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 Musical Fidelity X 10D tube line level preamplifier US $61.00
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 Eico HF 85 Tube Preamp Original Nice US $600.00
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 Pilot Model 240 Stereo Preamplifier Amplifier 6BQ5 12AX7 5AR4 Tubes US $308.30
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 KENYON T 2 INPUT TRANSFORMER LANGEVIN ALTEC WESTERN TUBE PRE AMP PROJECTS US $80.00
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 RARE KENYON P202 INPUT TRANSFORMER LANGEVIN ALTEC WESTERN TUBE PRE AMP PROJECTS US $100.00
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 KENYON INTERSTAGE INPUT TRANSFORMER LANGEVIN ALTEC WESTERN TUBE PRE AMP PROJECT US $40.00
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 VINTAGE SYLVANIA STEREO TUBE CONSOLE MODEL SC37F LOCAL PICKUP ONLY US $125.00
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 Collins 356A 1 Tube Microphone Preamplifier Mic Preamp US $315.00
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 jc VTG The Fisher 400cx Tube PREAMPLIFIER Nice US $610.00
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 ampex tube preamp from reel to reel recorder A 122 US $25.00
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 12AU7A Vacuum Tube Vintage Tube No Reserve One Cent US $.01
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 2 EACH NOS CDE TWISTLOCK CAN CAPACITOR 60uF 150V US $9.99
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 6AU4 RCA Vacuum Tube Vintage Tube No Reserve One Cent US $.01
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 6AG5 Vacuum Tube Vintage Tube No Reserve One Cent US $.01
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 6AV6 Vacuum Tube Vintage Tube No Reserve One Cent US $.01
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 WESTERN ELECTRIC D 163144 TUBE PREAMP OUTPUT TRANSFORMERS 185A 197A AMPLIFIER US $1,000.00
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 Amperex 7308 E188CC USN CEP PQ Matched Pair Gold Pin Test NOS 6DJ8 6922 US $54.00
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 Amperex PQ 6922 E88CC Gold Pin Matched NOS 6DJ8 6922 Guaranteed US $37.00
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 Carver C 19 vacuum tube preamplifier preamp – pristine US $775.00
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 One piece Tube pre amp Audio Line output transformer not Triad Utc US $.99
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 VINTAGE TUBE GE PREAMPLIFIER FOR VARIABLE RELUCTANCE CARTRIDGE US $10.99
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 Heathkit Stereo Tube Pre Amplifier Amp US $275.00
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 Harman Kardon Citation I tube preamplifier US $985.00
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 Very rare Harman Kardon citation III X tube tuner US $100.00
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 Vintage matched set 4 quad GE Kinsman branded ECC83 12AX7A tubes 1962 12ax7 US $2.25
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 Vintage matched set 4 quad RCA block logo ECC83 12AX7A tubes 1970s 12ax7 EN US $22.49
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 Shindo Giscours Monoblock Tube Preamps with Phono Stage US $4,150.00
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 Manley Labs Neo Classic 300B Stereo Tube Preamplifier Headphone Amplifier Rare US $3,499.00
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 Fisher 80 T Tube Tuner Preamplifier 3 US $9.99
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 Luxman CL35 MK III Tube Preamplifier Rare Mint Condition US $1,123.00
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 2 NOS Freed 23113 Output Transformers 30mA 4000Ω600Ω For Tube Preamp Pre Amp US $82.99
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 2 Filter Chokes by Stancor Chicago Transformer for Tube Amp Amplifier US $49.99
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 BOGEN PR 2 TUBE PREAMP US $5.50
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 Antique 3M Wollensak Magnetic Tape Recorder 1550 SS US $19.99
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 Tube Phono Line Pre amplifier fully complete kit incl enclosure and tubes US $199.00
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 FISHER X 100C GE 7868 AUDIO OUTPUT 12AX7 TUBE SCOTT STEREO PREAMP AMPLIFIER AMP US $222.50
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 7x General Electric RCA 12AU7 vacuum electron radio tubes old new stock US $.01
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 1x General Electric 12AX7 vacuum electron radio tubes old new stock US $.01
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 RARE VINTAGE LOMO KINAP YP 27 UP 27 УП 27 TUBE PREAMPLIFIER 2 INPUTS US $107.50
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 1x Zenith 1LB4 vacuum electron radio tubes old new stock US $.01
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 1x Dumont 12AB5 vacuum electron radio tubes old new stock US $.01
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 1x 35Z5 GT G Tung Sol with box vacuum electron radio tubes old new stock US $.01
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 1x General Electric 5U4 GA vacuum electron radio tubes old new stock US $.01
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 LOT of 2 Sylvania 6A7 vacuum electron radio tubes US $.01
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 2x RCA 6550 vacuum electron radio tubes old new stock US $.01
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 2 Chicago Transformer Filter Chokes 4 H 50 mA Tube Amp Amplifier Power Supply US $34.99
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 1x Ken Rad 1 V vacuum electron radio tubes old new stock US $.01
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 1x RCA CRC 5U4 G vacuum electron radio tubes old new stock US $.01
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 Marantz 7c Only Two Owners US $3,900.00
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 Rubycon Electrolytic Photo Flash caps Lot of 4 US $19.95
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 Soundcraftsmen MA5002 Power Amp Amplifier over 250 watts per channel US $152.50
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 LUXMAN LUXKIT A505 TUBE PREAMP SUPER RARE US $660.00
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 MILITARY RADIO ELECTRONICS MANUALS MORE 330 BOOKS DVD US $9.99
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 Vintage matched set 12AX7A 4 quad GE Kinsman branded ECC83 tubes 1961 12ax7 US $1.29
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 VINTAGE OUTPUT TRANSFORMER FROM A MAIHAK TUBE MIC PRE AMP TELEFUNKEN V 76 EF 12K US $40.00
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 McIntosh C28 Stereo Preamplifier FULLY Tested GREAT Condition NO RESERVE US $162.49
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 THREE NOS RCA 27 Black Plate Triode Vacuum Tubes US $9.99
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Edward Christopher Wente and the Condenser Microphone
Edward Christopher Wente, or E.C. Wente, was hired by Western Electric to improve the quality of telephone audio. By the end of his life, E.C. Wente was known for his work with the condenser microphone. Wente's work was instrumental in the history of the telephone, telecommunications and the development of the answering service industry.
Wente's research on the microphone was used specifically in sound studies. He was hired to try and relieve the background noise that was coming up on telephone receivers. Wente used the old electrostatic transmitter to change it into the first flat frequency response microphone, or condenser transmitter. This condenser transmitter consisted of one hundred times greater sensitivity than the sensitive transmitter. This sensitivity made the device practical, minus the fact that the device needed to be connected to a Vacuum Tube preamplifier to work to the best of its ability. The vacuum tube acted as an amplifier of the low single output. As years passed, Wente condensed the designs allowing electrical recording process and motion picture sound. This allowed the device to have different models such as being used on tabletop, floor standing, or able to be hung.
Besides working with the condenser microphone, E.C. Wente and his team were assigned to develop a Sound System to be used in films and cinema theaters. This invention came to be known as the "light valve." The light valve used the previous vacuum tube and converted audio voltage levels of light to expose movie film. It produced variable density sound patterns on film. This was the basis for the "sound-on film" process in later years.
Wente also aided in the invention of the compression driver, the dynamic mic, and acoustical wall materials. With all of the innovations he has made, E.C. Wente definitely stands out in the sound and production business and is an instrumental figure in the history and technology of the modern day telephone answering service.
About the Author
Specialty Answering Service is a nationwide live answering service and business answering service provider. We answer for each client 24 hours a day and follow their instructions to handle each inbound or outbound communication perfectly.