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Universal Mono Preamplifiers

Panorama Premium Mono Preamplifer
Panorama Premium 1.0 Mono Preamplifier

Prior to 1954, when the RIAA curve was adopted by the recording industry as the de facto standard, there were dozens of equalization (EQ) curves in use. Some were standardized in-house by label, while others were improvised on the spot by the recording engineer. For the vintage LP and 78 collector, restoring the EQ curve that matches the original recording is critical to enjoying the music as it was intended to be heard. A few widely used settings were often included in hi-fi components from the 1950s, but deviations from the RIAA curve are rare in modern gear. The Panorama Universal Mono Preamplifiers change all of this by incorporating the most comprehensive choice of user friendly EQ settings available today.
EQ playback curves consist of two major parameters — the Bass "Turnover" frequency and the 10kHz Treble "Roll-Off" value. They define a bass boost curve with a 3dB cutoff or "corner" frequency at the Turnover point and a Roll-Off or "cut" curve which reduces the gain above a certain point, so that the gain at 10kHz equals a specified value. Note that some 78 EQ curves have a 10kHz Roll-Off of Zero dB, meaning that they are flat at the treble frequencies. In addition, in the world of 78s, there is also a low bass setting called "Shelf" which is fixed at 50Hz.
The audio circuit, designed by Dr. Arthur Loesch (pronounced "Lesh," like the Grateful Dead's Phil Lesh), is virtually identical to the now-discontinued Arthur Loesch 1.1 Control Preamplifier, which was rated "Class A" by Art Dudley in Stereophile and about which the Bound For Sound Audio Report devoted two extensive reviews. The primary difference is the addition of variable bass (Turnover) and treble (Roll-Off) filters, for which Dr. Loesch calculated the values, as well as a new low output circuit for high output cartridges. With 12 bass and 12 treble restoration points, a total of 144 different equalization curves (including RIAA) are possible. With the right combination dialed in, vocals and instruments are fully restored to their proper balance.
Bass Turnover Switch PositionBass Turnover Time Constant Treble
Roll-Off Switch Position
Roll-Off Attenuation @ 10kHz
  AAcoustic  1Acoustic
  B150Hz  2  -5dB
  C200Hz  3  -7dB
  D250Hz  4  -8dB
  E300Hz  5  -8.5dB
  F350Hz  6-10dB
  G400Hz  7-10.5dB
  H450Hz  8-11dB
  J500Hz  9-12dB

For your convenience, each switch has a corresponding letter or number code that makes it easy to annotate your records for a future listening session. For example, a record cut with the RIAA curve can be labeled "J 11," Okeh 78s can be labeled "D 4," early Blue Notes "J 7," and so on.
A comprehensive guide to 78 RPM EQ settings and disk speeds, as well as a guide to early LP EQ settings is periodically revised to suggest these settings. Of course, you can always make adjustments by ear.
The Sound
In voicing the phono circuit, unamplified music, recorded in a live environment without overdubs or electronic manipulation, was used as the primary reference, resulting in a natural, well-balanced sound. If the details are on the disk (or disc) and the rest of your audio system is on par, you will easily hear nuances that were previously hidden. These include those unique, low-level cues which distinguish individual recording spaces from one another, even on mono 78s.
Dr. Loesch's philosophy of mixing component brands throughout the circuit cancels out any brand or type's sonic signature and contributes to a listening experience that is notable for its natural bass, glare-free treble, and rich, detailed midrange. In addition, there is an uncanny degree of clarity and "air" which enables you to follow individual instruments and voices with ease. With associated equipment of equal quality, the hardware disappears, leaving you alone with the performance, itself.

The Circuit
The phono circuit amplifies the audio signal in three gain stages and is suitable for any cartridge with an output of 0.1mV (or lower) up thru 7.5mV, including both moving coils and moving magnets. Panorama models include 12 popular cartridge loading resistors that can be dialed in from the front panel, while the Monographs feature a 100 ohm or 47K ohm front panel switch. Both models allow the listener to install a custom cartridge loading resistor in a spring-loaded, plug-in socket that is located on the main board next to the phono inputs. This provides a way for the built-in phono load resistors to be superceded by a custom value.
Phono Load Detail
Custom Phono Load Socket

Moving Coil or Moving Magnet?
The original Loesch high-gain (+60dB) vacuum tube phono circuit was designed specifically for low-output moving coil cartridges, eliminating the need for a step-up transformer or pre-preamplifier. An additional low gain (+40dB) circuit for high output cartridges is also included, along with a tube-based (+14dB) active line stage.
While first developed for 78 RPM collectors, listeners with large collections of pre-1954, as well as modern mono LPs, will also enjoy the benefits of proper EQ. A pair of Panorama Mono Preamplifiers, with their separate, dedicated power supplies, will bring a lifetime of enjoyment from stereo recordings, too.
The Panorama Mono preamp is available in two versions, Premium and Silvermine. Functionally identical, they both include passive and active line stages, as well as additional features. They are both full function preamps, not "phono stages," but complete phono-based components. While you can use them with the passive or dummy input of a line stage or other preamplifier, they are designed to be stand-alone units that connect directly to your power amplifier(s). While not necessarily harmful, they will lose their carefully voiced characteristics when plugged into an active line stage.
What's New
The updated versions feature a redesigned circuit board that aligns the front panel controls in a way that reduces their signal paths and makes assembly more efficient. Plus, a second, dedicated 5687 dual triode has been added to form the basis of the high output (MM) circuit.
Panorama 2
Panorama Premium 2.0 Mono Preamplifier, Front Panel
Panorama Premium, Rear Panel
Panorama Premium 2.0 Mono Preamplifier, Rear Panel

Features: Panorama Premium and Panorama Silvermine Audio Stage
  • A 3-stage High Gain (+60dB) phono circuit, suitable for use with any moving coil phono cartridge (0.05mV-2.0mV output) without a step-up transformer
  • A 3-stage Low Gain (+40dB) phono circuit, suitable for most Moving Magnet or Moving Iron cartridges (2.0mV-7.5mV output)
  • One Tube Active Line input with 14dB of gain
  • Two Passive Line inputs (no gain circuit) connected directly to the volume control
  • A Plate Voltage Adjustment control, with a dedicated panel meter, for the first stage tube
  • Three selectable phono inputs (up to 6 phono inputs are possible)
  • Front panel selectable cartridge loading resistors in 12 popular values
  • Provision for a custom phono load resistor in any value
  • Variable cartridge capacitance loading from 50pF to 350pF in 50pF steps (custom values on request)
  • Premium copper foil audio capacitors by V-Cap, REL AudioCap, and Jupiter
  • Premium audio resistors including "Naked" Vishay TX2575, Audio Note Tantalum, Caddock, Huntington, Dale, and PRP
  • A ladder-type stepped attenuator built-up with Vishay-Dale axial resistors, based on a Swiss-made Elma switch
  • WBT NextGen Ag Pure Silver RCA sockets
  • The Arthur Loesch designed 1201B+ tube-rectified and tube-regulated power supply
  • Two Main Output sockets wired in series, so that mono signals can be played on a stereo system
  • A Record Out socket that bypasses the volume control for recording the output signal to another device
  • A hand-built, ladder type volume control with only two resistors in the circuit path in any position
  • Double-thick, 0.125" circuit boards with extra heavy traces for low internal resistance
  • Classic-style, full-size components throughout; no sub-miniature SMDs (Surface Mount Devices)
  • No electrolytic capacitors in the Audio Stage
  • Pure silver, Teflon-insulated audio signal wire
  • Teflon-insulated, silver-plated copper wire throughout the power supply
  • 120V/60Hz and 240V/50Hz switchable voltages for world-wide use
  • 15A Furutech Male IEC connector on the power supply for use with custom and worldwide power cords
  • All units are assembled by hand in our workshop near Saratoga Springs, NY, with 95% of the parts sourced from USA and European manufacturers

Specifications: Panorama Premium Audio Stage
Gain+60dB Moving Coil Phono
+40dB Moving Magnet Phono
+14dB Active Line
0dB Passive Lines
Tube Complement (Vintage NOS USA or UK tubes supplied)
1st Gain StageWestern Electric 417A
2nd Gain StageRCA 6GK5 / 6FQ5A
3rd Gain StageTung Sol 5687 x 2
3rd Gain StageTung Sol 5687 Active Line
Phono x 3 (up to 6 possible)
Passive Line x 2
Active Line
OutputsMain Out x 2 Connected in Series
Record Out x 1
EQ FiltersTreble (12-position "Roll-Off")
Bass (12-position "Turnover")
Deep Bass ("Shelf" fixed at 50Hz)
Frequency Response5Hz - 50KHz
Phono Input Impedance12 built-in selectable values, plus the option of a 12th custom value via an internal, spring-loaded socket.
Phono Output Impedance10K Ohms (typical)
Recommended Amplifier Input Impedance100K Ohms (typical)
Total Harmonic DistortionNo more than 0.1%
IM DistortionNo more than 0.1%
Signal-to-Noise RatioBetter than 87dB
External Ground ConnectorEarth Ground (AC Earth)
Signal GroundSwitchable via locking rear toggle:
  • Signal Grounded or
  • Floating
Dimensions17.48" Wide x 16.0" Deep x 6.5" High (including feet)
(444mm Wide x 406mm Deep x 165mm High)
Net Weight13 lbs. (5.9 kg)
Shipping Weight21 lbs. (9.5 kg)

Additional Features: Panorama Silvermine Audio Stage
The Silvermine upgrades the Premium with Jupiter and Audio Note Silver Foil coupling capacitors, three Duelund Silver Hybrid coupling capacitors, and critically placed Audio Note Silver/Tantalum resistors.

Specifications: 1201B+ Power Supply

1201B+ Power Supply

Tube Complement
(Vintage NOS USA or UK tubes supplied)
5V4 Rectifier
6FW5 Output
6AN8A Amplifier
12AT7 Amplifier
5651 Regulator
AC Mains Input
(Dual Voltage on a toggle switch)
120V / 60Hz
240V / 50Hz
Dimensions8.37" Wide x 16.0" Deep x 6.25" High (including feet)
(213mm Wide x 406mm Deep x 160mm High)
Net Weight23 lbs. (10.4 kg)
Shipping Weight31 lbs. (14 kg)

Prices in USD $, Plus shipping from Saratoga Springs, New York 12866, USA
Panorama Premium
including the separate 1201B+ Power Supply
Additional inputs or outputs based on WBT NextGen Ag Pure Silver sockets$100 each
Additional "Naked" Vishay TX2575 Custom Phono Load Resistors$25 each
Panorama Silvermine
including the separate 1201B+ Power Supply

Stereo PlaybackTwo complete mono units, including two mono power supplies, are required for stereo
Warranty10 years, transferable, on parts and labor. 90 days on vacuum tubes. Unauthorized parts substitution or modification(s) may void the warranty.
AvailabilityPlease inquire.

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Note: Conceptual illustrations, specifications, prices, and production dates are subject to change without notice.

Tempo Electric Custom Audio LLC
PO Box 770
Saratoga Springs, NY 12866-0770
+01 (518) 542-7004

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