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 NOS Western electric tube preamplifier 147B US $199.99 
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 Peaco interstage input transformer for high-end DIY tube preamplifier project*** US $50.00
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 Four (X4) Japan-made Raytheon ( Hitachi) 12AU7A ecc82 12AU7 preamp driver tube** US $25.00
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 Dynaco PAS-2 Stereo Tube Preamp_NR US $168.50
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 TUBE AMP/PREAMP DAMPERS FOR 12AX7/12AU7/12AT7/ECC83/EL84/6922/EL84/5751/5687 US $8.99
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 BOOK COLLECTION TUBE PHONO PREAMP ELECTRONICS ON CD US $14.95
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 Vintage HYTRON 12AX7 Tall Black Plate Preamp Tube US $14.50
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 PREAMP TUBE SHIELD HOLDER COVER 12AX7 12AT7 12AU7 US $1.00
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 MOTOROLA SK52 W TUNER TUBE PREAMP HS 823D 9AA60 STEREOPHONIC RECIEVER FIDELITY US $49.99
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 Tube PreAmp Bare PCB with Upgrade design for C.J. PV-12 US $9.90
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 Tube pre amp Audio Line output transformer ( not Triad Utc ) US $35.00
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 ZENITH SONY TUBE AMP PREAMP TUNER RECEIVER SILVER KNOBS US $13.99
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 HP API NEVE ALTEC TUBE GUITAR AMP PREAMP TEST GEAR KNOB US $19.99
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 MARANTZ 1 MEG OHM DUAL TUBE AMP PREAMP LINEAR VOLUME BALANCE TAPER POT US $77.99
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 Tube Preamplifier Board With Volume /Bass /Treble /Balance Adjust with Schematic US $68.50
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 Tube Amp Chassis DIY 14.2x10x2 Aluminum Project Box Enclosure Stereo Amp Preamp US $82.00
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 Meixing Mingda MC-2A3 Vacuum Tube Pre-Amplifier 20th Anniversary Brand New US $1,899.00
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 R-Core Power Transformer for DIY tube DAC, preamp, etc. US $35.00
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 Vintage Regulated Tube Power Supply for Preamp Marantz Etc US $259.00
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 Tube PreAmp Finish PCB - Upgraded design for Cary SLP90 US $76.00
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 VARIAC REGULATOR 4 VINTAGE WESTERN ELECTRIC TUBE AUDIO POWER PREAMP AMPLIFIER US $249.00
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 Fisher 80c tube preamp MINTY! US $650.00
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 MCINTOSH MC-275 240 C-22 MI-3 TUBE AUDIO POWER AMPLIFIER TUNER PREAMP CATALOG US $24.99
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 Telefunken ECC82 / ECC 82 / 12AU7 Audio Preamp Tube, Diamond Base US $69.00
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 12AT7 / ECC81 NOS Preamp Vacuum Tube (New Old Stock) AMERICAN / Western European US $10.90
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 12AU7 / ECC82 NOS Preamp Vacuum Tube (New Old Stock) AMERICAN / Western European US $18.25
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 Vintage 1953 Ampex 3761 Tube Mic Preamp Mixer + 5 UTC HA-100X Transformers MX-10 US $1,055.00
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 Dynakit Model PAS-2 tube preamplifier Dynaco vintage FM tube tuner US $152.50
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 Vintage EICO Tube Pre Amp Amplifier HF-61 High Fidelity Master Control NR US $15.50
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 Vintage Tung-Sol 12AX7 Tall Plate Foil Getter Preamp Tube US $12.50
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 Vintage 1974 RCA 12AX7A ECC83 Preamp Tube US $9.49
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 GENERAL RADIO 0-140V@ 0-10A DUAL METERED VARIAC FOR TUBE GUITAR AUDIO AMP PREAMP US $489.00
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 Tube PreAmp Finish PCB- Upgraded design to Mcintosh C22 US $76.00
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 ALLEN BRADLEY 280K TUBE AMPLIFIER PREAMP LIN TAPER POT US $69.00
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 Vintage Dumont 12AZ7 Stereo Tube Pre Amp New In Box US $12.99
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 McIntosh MC-60 Tube Amplifier, C-8 Preamp, Articles, Info, NEAR MINT Original! US $29.75
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 Pilot 248b Tube Preamp Review, 1963, 3 pgs, Full Test, Very Rare! US $7.99
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 Heathkit Stereo Tube Pre Amplifier Amp US $275.00
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 RAPHAELITE Sinovt 6C16 Vacuum Tube PreAmplifier XLR New US $599.00
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 NEW METERED VARIAC 4 MARANTZ 9 1OB 7 8B TUBE AUDIO POWER AMPLIFIER TUNER PREAMP US $289.00
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 Eico HF-85 Tube Preamp. Original Nice US $600.00
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 Valve Class A Tube Headphone Earphone Preamp Mini Amplifier Bravo Audio Ocean US $129.99
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 RARE VINTAGE BELL RT-65 REEL TO REEL TUBE TAPE RECORDER AMP PREAMP US $150.00
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 Vintage RCA 5965 12AV7 Tall Black Plate Triple Mica Preamp Tube US $.99
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 Vintage Raytheon USA 12AX7A Tall Black Plate Baldwin Preamp Tube US $6.05
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 Vintage RCA 12AX7 Tall Black Plate Preamp Tube US $6.05
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 Vintage Mullard IEC 12AX7 ECC83 Great Britain Preamp Tube US $11.50
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 KENYON T 2 INPUT TRANSFORMER LANGEVIN ALTEC WESTERN TUBE PRE AMP PROJECTS US $80.00
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 Mullard 12AX7 ECC83 Preamp Vacuum Tube TESTS NEW US $3.25
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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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 TUBE AMP PREAMP/DRIVER SOCKETS SECTION 12AT7 6X4 5651 US $12.95
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 Vintage GE 6ES8 ECC189 Mullard Preamp Stereo Tube US $9.99
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 218 213 185 156 136 125 VOLT 500 MA TUBE AMP PREAMP POWER TRANSFORMER TEKTRONIX US $249.00
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 Shindo Giscours Monoblock Tube Preamps with Phono Stage US $4,150.00
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 5 OHM 2 WATT DALE GUITAR TUBE AMPLIFIER PREAMP POWER RESISTORS US $9.99
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 HICKOK 6.3 150 210 VOLT TUBE PRE AMP POWER TRANSFORMER US $59.49
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 Meixing MingDa MC-7R Vacuum Tube Pre-Amplifier MC7R New US $499.00
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 Leak Point-One, Stereo 60 Tube Amp, Preamp Review, 3pgs US $7.99
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 TUBE SOCKET CONVERTER from ECC83 / 12AX7 into RUSSIAN Preamp tube 6N2P or -EV US $15.99
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 Quad 22 Preamp,Quad II Tube Amplifier Review,1960,3 pgs US $7.99
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 6X4 6N1 6H1N Vacuum Tube Preamp Pre Amplifier W/ Adjustable Bass Treble Balance US $42.00
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 Vintage Raytheon 12AX7A Preamp Tube US $.99
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 TUBE AMPLIFIER PREAMP REGULATOR MOSFET TO-3 HEATSINK US $39.99
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 HIFI stereo audio amplifier 6N3 Tube PRE-AMP Buffer US $59.99
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 Telefunken Smooth Plate 12AX7 Preamp Tube Germany - TV-7D/U Tested *DB* US $39.99
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 ampex tube preamp from reel to reel recorder A-122 US $25.00
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 TUBE PHONO PREAMP ELECTRONICS BOOK LOT ON CD US $14.95
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 BOOKS TUBE AMP PREAMP ELECTRONICS COLLECTION ON CD US $14.95
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 PREAMP AND AMPLIFIER TUBE ELECTRONICS BOOK LOT ON CD ROM US $14.95
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 BUILD YOU OWN TUBE PREAMP ELECTRONICS BOOK LOT ON CD US $14.95
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 BOOKS TUBE PHONO PREAMP ELECTRONICS COLLECTION ON CD US $14.95
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 TUBE PREAMP & AMPLIFIER ELECTRONICS BOOK LOT ON CD ROM US $14.95
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 6DJ8 US Made Audio Preamp Tube Free Ship US 48 US $9.95
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 jc) VTG The Fisher 400cx Tube PREAMPLIFIER - Nice - US $610.00
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 Telefunken 7025 12AX7 ECC83 Tube audio amplifier preamp phono line Guitar US $155.00
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 Sylvania 12ax7/ecc83 Grey Plate O Getter JAN WA Preamp Tube 110 + test US $24.99
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 Single GE 12ax7/ecc83 1957 CBS Brand D-Getter Preamp Tube 90+ test US $19.99
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 Single Mullard 12ax7/ecc83 Preamp Tube 100 + test US $44.99
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 Single Amperex 12ax7a/ecc83 Preamp Tube 95-100 test US $29.99
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 Single GE 12ax7a/ecc83 Blue Halo D-Getter Preamp Tube 95+ test US $19.99
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 Single Raytheon12ax7a/ecc83 O-Getter 105 + test... Preamp Tube US $24.99
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 Single RCA 12ax7/ecc83 Grey plate D-Getter Preamp Tube 115+ test US $24.99
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 Single RCA 12ax7/ecc83 Black plate D-Getter 95+ test Preamp Tube US $24.99
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Tube Preamp
ART Pro MPA II Studio 2-Channel Tube Preamp
Mesa Boogie Mark Series
The 'Mesa Boogie Mark Series is a series of guitar amplifier drafted by Mesa Engineering. It was Mesa's flagship yield until the introduction of the Rectifier series, and the amplifiers are very collectable.
The very first Mark I was drafted in 1969, past Smith, as a jest, corrected Barry Melton's (Country Joe and the Fish) Fender Princeton amplifier. He extracted the yardstick 10 inch speaker and corrected the chassis to fit the enlarged transformers that were was deficient by the 4-10 tweed Fender Bassman, the circuit that he had supplemental into the 12 watt Princeton. Finally, mounting a 12 inch JBL D-120, a republican speaker of the time, Smith had written what would be the first Boogie. Randall Smith took the "hot-rodded" Princeton into the front store.
Coincidentally, Carlos Santana was prevailing and "wailed through that tiny amp until population were blocking the sidewalk." Impressed, Santana articulated Smith, "Man, that tiny amp truly boogies!", consequently delivering the existing call for the amplifier and the company. "Mark I" is the moniker given to the first Boogies ever drafted, even so they were not summoned "Mark I" until the Mark II came along. They were 100 or 60 watts combo amps with a 12-inch speaker, at the start Altec-Lansing 417-8H Series II.
The Mark I had couple channels: one bathe (voiced quite interchangeable to the original Fender) summoned "Input 2," and one "high gain," summoned "Input 1," which effected the overdriven "Boogie lead" utterances adapted bulk notably by Carlos Santana on the "Abraxas" album, and later by The Rolling Stones, with Keith Richards and Ron Wood including the amps survive from 1977 until 1993 and in the studio on classic albums as Some Girls and Tattoo You.
This amp in its original variety is very collectable, but does not have footswitching capabilities--one plugs into one or the other input for the couple tones. Reverb was optional, and not prevailing on more early Boogies. Later, Mark I models were available with reverb and/or graphic EQ. Early models have "slave out" and "reverb" labeled on the behind with Dymo stick; they do not have any "pull lead" competency on the volume controls. Later models had "Pull Bright" and "Pull Boost" on the volume controls.
The front panel controls were Volume 1, Volume 2, Treble, Middle, Bass, and Master. These early models are rightly differing, since more of them were "custom" models, alone fitted out for various buyers. Mesa/Boogie has stated the original and the reissue have a "looser" lead utterances since the first couple preamp points in time eventuates in the past the tone controls. In the various later Mark II and III models, there is simply one gain point in time in the past the tone controls. This indication chain is an subject of numerous contest among Boogie owners. The Mark II introduced channel footswitching, and wasn't referred to as the "Mark IIA" until the Mark IIB was issued.
It was also available as a chief, which could be hooked higher to a diagram of dissimilar speaker combinations, even so a 1x12 cabinet was typical. However, the reverb circuit is considered noisy and the Waxed Cotton Cordspy voice recorder footswitching drafted a popping utterances past used; both of these attributes were later transformed on the Mark IIC. The preamp gain on the Mark IIs eventuates later the tone controls and so, according to Mesa/Boogie, the IIA has a "tighter, more fled accent on sound" than the Mark I.
The IIA and IIB, and numerous late-model Mark I amps, adapted a silicon implement summoned "fetron" in place of one of the 12AX7 preamp tubes, and included a switch for configuring the amp for either fetron or 12AX7 operation. The intent for including a fetron was to appraise numerous of the difficulties joined with microphonic 12AX7 tubes in a high-gain situation; its exercise was later discontinued. The Mark III was launched by Mesa/Boogie in 1985.
It introduced a third channel, a "crunch" rhythm utterances right in between the rhythm and lead channels. This amp has a many footswitch system: one footswitch replacements between the existing rhythm mode and the lead mode, and the other decides either the bathe rhythm mode or the crunch rhythm mode. The couple rhythm modes detail all of their controls, where the lead mode simply allocations the rhythm modes' tone heap, featuring independent gain and master volume controls. The Mark III suspended demonstration in 1989.
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