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#1
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Passive Preamp with Transformer Volume Control
Hi, guys.
Does anyone have experience with passive line stages that use a transformer for volume control? I'm considering one to drive my Pass Labs XA100.5 (1.41 volts required for full output) from the K-03 DAC (2.45 volt output at 0 dB with optional +6 dB gain available). What I like about these transformer volume control-based line stages is that no power is lost as volume is attenuated and actually the output impedance drops as the gain decreases so the sound does not deteriorate at low levels. Here is what I found in a Stereophile review about this: Quote:
Last edited by cma29; 05-10-2014 at 12:39 AM. |
#2
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Bump
Any thoughts, anyone, before I pull the trigger on this design? Thanks. |
#3
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Today is your lucky day Carlos. I was able to find the transformer you need and it is being delivered to my house this afternoon.
As soon as I'm able to add the passive circuitry, I'll ship it to you in Missouri. Cost was a little more than I anticipated, but I don't think that will bother a man of your means. Best wishes, Julian
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.... I have a record player and a cd player and some other stuff that sounds pretty good. MAIN SYSTEM: . . . Audio Physic Caldera III Loudspeakers, Spectral DMC 30SL Preamp, Spectral DMA 250 Amp, Spectral/MIT interconnects and speaker cable, Basis Debut V Vacuum turntable, Walker Precision Speed Controller, Graham tonearm, [B]Koetsu Rosewood or Grado Statement 1 Cartridges, PASS - X-ono Phono Stage, Esoteric K03 CD/SACD Player, Lexicon RT-20 Universal Player, Exact Power EP-15A & SP-15A power regeneration and conditioning devices. Symposium Acoustics Svelte pads & RollerBlock Jr's under speakers. ASC Tube Traps, Arcici Suspense Rack System, OPPO and Cambridge Streaming Devices. DOWNSTAIRS SYSTEM: . . . Sonus Faber Guarneri Memento Speakers, JL Audio F112 Sub, McIntosh MA7000 Integrated Amp, McIntosh MVP871 Universal Disc Player, OPPO BDP-105 Blu-Ray Player, VPI Scoutmaster with periphery ring clamp, VPI SDS Motor Drive, Koetsu Pro IV, or Clearaudio Discovery Cartridges, Mark Levinson No. 25s phono stage, Wadia 170i Transport with a Meridian Bitstream 203 DAC, VPI HW-17 Pro Record Cleaning Machine, Five Richard Gray RGPC 400 devices scattered around the two systems, Arcici Suspense Rack System, Discovery Essence and Essential Cables, 14,000 ± LPs . |
#4
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Quote:
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#5
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Hi Carlos,
How are you liking the Bent Audio Line Stage? Best, Ken |
#6
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Quote:
John Chapman, the guy behind Bent Audio is building the preamp for me right now. To keep it as simple as possible, mine will have one XLR input and 2 XLR outputs. What I like about this unit is its simplicity and its ability to increase current delivery to the amps as voltage (gain) is turned down, so the lower the gain the lower its output impedance. It makes sense to me, but the final verdict will have to wait until I actually install the unit into my system! Here is a link to a review for one of these units: Bent Audio AVC-1 Modular Remote Control Autoformer Preamplifier Oodles of resolution, excellent imaging and spatial effects! Review By Clive Meakins My version is a little more involved because of the XLR balanced operation. Last edited by cma29; 05-12-2014 at 10:45 PM. |
#7
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Brings new meaning to "Get Bent"
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Ivan FLORIDA MX136, MC1.2KW(10) MC2KW(2), MCD1100, MS750(2) MVP881, C1000C/P/T, MPC1500, HT-2 SUBS(2) HT3F(2) WS350(2) XRT2K, XCS2K, XR27(2) XCS350(2) JL GOTHAM v2 SUBS(2) SILENZIO MUSIC SERVER, LUMAGEN RADIANCE SCALER, SONY VPH-G90U 4K PROJECTOR, STEWART 120" MOTORIZED SCREEN, CINEMA-TECH SEATING, WW PLATINUM CABLES Reference System: ACCUPHASE A300 AMPS, C3900 PRE-AMP, DP1000 CD/SACD TRANSPORT, DC1000 DIGITAL PROCESSOR, DG-68 DIGITAL EQUALIZER, T1200 FM STEREO TUNER, PS1230 POWER SUPPLY, HRS-SXR CUSTOM RACK w/ M3X SHELVES, TAD REFERENCE ONE MK2 LOUDSPEAKERS, WW PLATINUM CABLES CAPE COD MX150, MC501(2) MC1.2KW(10) MC2301(2) MR88, MVP881, MCD1100, MDA1000, C1000C/P/T, MPC1500, ESOTERIC K-01X 30th ANNIVERSARY (BLACK) SACD/CD PLAYER, G02-X CLOCK, HT3F(2) XRT2K, XCS2K, XR27(2) JL GOTHAM v2 SUBS(2) JL FATHOM F113v2 SUBS(4) SOUND ANCHOR STANDS(2) KALEIDESCAPE STRATO & TERRA SERVERS 80-TB, LUMAGEN RADIANCE SCALER, SONY VPH-G90U 4K PROJECTOR, STEWART 120" SCREEN, SONUS FABER STRADIVARI, SILENZIO MUSIC SERVER, FORTRESS SEATING, WW PLATINUM CABLES Analog Rig: CLEARAUDIO INNOVATION WOOD, UNIVERSAL ARM w/ Da VINCI' CART, 2nd UNIVERSAL ARM w/ GOLDFINGER STATEMENT CART, HRS-MXR REFERENCE RACK-GLOSS BLACK w/ M3X SHELVES, AESTHETIX RHEA SIG PHONO-PRE, BRYSTON BHA-1 HEADPHONE AMP, WW PLATINUM CABLES Reference System: BURMESTER 911MK3 AMP(3), 088 PRE-AMP, 089 CD PLAYER, 100 PHONO PRE-AMP, 948 POWER CONDITIONER, ACCUPHASE DG-68 VOICING EQUALIZER, AVID ACUTUS REFERENCE SP TT, GRAHAM PHANTOM II SUPREME ARM, BENZ MICRO LP-S CART, GRANDIOSO P1X/D1X STACK, G1X RUBIDIUM MASTER CLOCK, N05 NETWORK PLAYER, SILENZIO MUSIC SERVER, HRS-SXR CUSTOM RACK w/ M3X SHELVES, SONUS FABER AIDA SPEAKERS, JL FATHOM F113v2 SUBS(2) SOUND ANCHOR STANDS(2) WW PLATINUM CABLES Library System: GRANDIOSO M1 MONOBLOCK AMPS, C1 LINESTAGE PRE-AMP, K1X CD/SACD PLAYER, G1 MASTER RUBIDIUM CLOCK, E02 PHONO-PRE, SILENZIO MUSIC SERVER, AERIAL ACOUSTICS 20T V2, AERIAL SW12 SUBS(2), CANTON REF K1’s, VPI HRX TT w/ SDS POWER SUPPLY, ORTOFON CADENZA BLACK CART, KLAUDIO RCM, SHUNYATA DENALI 6000/S v2, SHUNYATA OMEGA QR’s, WW PLATINUM CABLES Esoteric/Bryston System: ESOTERIC C02-X PRE-AMP, P-02X TRANSPORT, D02-X DAC, G02-X CLOCK, BRYSTON 28B3 CUBED MONOBLOCK AMPS(4), BRYSTON BHA-1 HEADPHONE AMP, SHUNYATA DENALI 6000/S v2(2) EVEREST 8000 POWER CONDITIONER(2) ALTAIRA CG & SG HUBS, AMR-DP777-SE DAC, SILENZIO MUSIC SERVER, TAD REFERENCE ONE MK2 LOUDSPEAKERS, QUADRASPIRE RACK, WW PLATINUM CABLES Accuphase/Canton System: ACCUPHASE E800 INTEGRATED, DP570 CD/SACD PLAYER, T1200 FM STEREO TUNER, DG-68 VOICING EQUALIZER, PS530 POWER SUPPLY, CANTON REF K3’s, CANTON REF K5’s, SILENZIO MUSIC SERVER, HRS MXR REFERENCE MAHOGHANY RACK w/ M3X2 SHELVES, WW GOLD CABLES |
#8
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Yeah. It's not the best brand name in the world.
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#9
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Quote:
That was an interesting read. I can see the potential advantages of this design. I wish you a lot of luck with it. Please let us know how you like it once you take delivery. Best, Ken |
#10
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My transformer volume control preamp has been built and tested and is on its way to Columbia.
I should have it this week. Can't wait to plug it into my system. |
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