Jadis 845SE Triode Monoblock Tube Amplifier Pair - Open Box W/New Caps

Free Shipping on *ALL* Electronics (Excluding Speakers, Contiguous 48 US States Only)

Super rare find from an avid Jadis collector who was in the process of putting together a huge Jadis system that was unfortunately never finished.

These are their 845SE tube based monoblocks amplifiers.

This model is also no longer in production.

Retail price in 1992 was $20,000 equaling more than $38,000 in today's dollars.

These are also 110V which are even harder to find.

We actually have another set of these amplifiers (currently available) that are barely used/mint, so we hooked them up to our Wilson X-1 Grand SLAAM speakers for testing. We were treated to the best dynamics and ease we've ever heard from them by FAR. 

These will ship for $450 flat rate freight anywhere within the lower 48 US States strapped to a pallet due to its weight and for safe travels. We strongly recommend 2-3 friends to help you unbox safely on arrival. Free local pickup from our shop is also welcome.

*Please note due to size and weight this item is not covered under our free shipping promos that we offer from time to time.

SkyFi Notes:
• Original Jadis factory boxes are included with your purchase, but the boxes do not show the serial numbers that match each unit.
• Both amps have new main filter caps (blue). Very low hour units, maybe 8 hours total for testing.
• The only sign of wear is on the brass transformer cover. One unit seems to have a slightly bent chassis where one bottom foot is slightly higher. Does not affect performance in any way.
•We are super conservative with things like this which is why we mention. Most would never see.
• The manual for this set is a photocopy with no serial numbers indicated.
• In testing we found that cheater plugs are needed to keep these amps from displaying a low level hum.

Specifications:
Type:
Triode single ended monoblock

Bias:
Autobias

Power - EACH:
20W class-A

Bandwidth:
20 Hz to 22 kHz

Sensitivity:
500mV

Tubes Complement:
2 x 845
2 x 6NS7
2 x ECC83

Dimensions - EACH:
26" x 12" x 9-1/2"
(65 x 30 x 24 cm)

Weight: - EACH:
77 lbs.
(35 kg)

Power Consumption:
200W per unit

Click below to add our recommended matching cables from Kimber Kable, all brand new as SkyFi is an official Kimber dealer.

Kimber Kable - RCA Interconnects - Better

Kimber Kable - RCA Interconnects - Best 

Kimber Kable - Speaker Cables - Better

Kimber Summit Series Monocle XL Speaker Cables (PAIR) - Best

Kimber Summit Series BiFocal XL Bi-Wire Speaker Cables (PAIR) - Best If Applicable 

Kimber Kable - Base 14 Gauge Power Cord - Good

Kimber Kable - Base 10 Gauge Power Cord - Good

Kimber Kable - Ascent 14 Gauge Power Cord - Better

Kimber Kable - Ascent 10 Gauge Power Cord - Better

Kimber Kable - Palladian 14 Gauge Power Cord - Best

Kimber Kable - Palladian 10 Gauge Power Cord - Best

The SkyFi Testing Process for Tube Amplifiers:

We start with a visual inspection of all internal components to make sure that there are no signs of heat stress or damage. Capacitors are checked for telltale signs of predictive failure including bulging, shrunken wrappers, or physical leakage. We also inspect resistors and other passive components for signs of overheating. If tube arcing has occurred in the past we can usually spot discoloration on the output tube sockets. On vintage units we often spot check select capacitors for value and ESR.

If the amplifier passes visual inspection, we move on to a full test of all of the tubes. We use an Amplitrex AT-1000 Tube Tester which is capable of testing both emission and Gm with a high degree of accuracy. We document the results of each tube and replace any weak or suspect tubes before proceeding. When we power on tube amplifiers for the first time we usually use a variac and current limited AC supply and slowly raise the voltage up to nominal mains level while monitoring plate, screen, filament, and negative bias supply voltages where applicable. If everything is in order we feed a low level test signal into the amplifier’s input and monitor its output on an oscilloscope across an 8 ohm dummy load. At this point we are just looking to verify basic function and confirm that the output transformers are not damaged. Once we have verified that the amplifier is safe to operate, we connected it to full mains power. For fixed bias amps we set the bias to manufacturer spec. For cathode biased amps we monitor the plate to cathode voltage to determine if the output tubes are operating in a safe range. Once the output section is verified we move onto bench evaluation.

We start by feeding the input of the amplifier with a low level 1KHz test signal, slowly increase its amplitude while monitoring the amplifier’s output on an oscilloscope for signs of noise, clipping, distortion, or improper channel balance. We continue increasing the signal level until the amplifier reaches clipping. At this point we take an output power measurement and compare it to the spec sheet of the amplifier to verify proper performance. We finish off the bench evaluation with a 1KHz square wave check and a 20Hz to 20KHz sine sweep to assess the amplifier’s frequency response characteristics. This battery of tests will usually reveal if the amplifier has any issues that need further attention.

Before the device leaves the bench, we perform a listening test with actual music using a variety of preferred test tracks. Our benches are outfitted with familiar monitor speakers which help us identify inconsistencies that will not always show up on our test gear. The main things that we are listening for are hum or noise with no signal present, proper center image, clicks, pops, or any other obvious undesirable audio characteristics.

If the unit passes all of these tests it is moved to our long term testing rig where we simulate real word operating conditions for 6-8 hours. For tube amps we like to run this test at least twice. This allows us to monitor the unit for signs of thermal runaway or intermittent issues that only crop up when it has fully come up to temperature. We find this step to be essential, especially for vintage units.