Contents Preface Illustrations Safety Notice Installation Vacuum Tubes In your System Connections Rear Panel Connections AC Power Connection Operation Power-up Procedure Direct Power Amp Mode Procedure General Notes about Usage Front Panel Control Function Remote Control Function Maintenance Test for Quiescent Current of Power Tube Bias Adjustment Setting Servicing Cleaning...
Before use we encourage you to please read this manual thoroughly to properly acquaint yourself with its features. We hope you enjoy listen- ing to Aeron product as much as we have had the pride that we have taken in manufacturing this fine receiver for your listening pleasure.
Illustrations Front Panel Power ON/OFF Switch Input selector: Line in 1-3, Balanced, Phono VU Meters Volume Control 3.5mm Input Direct Power Amp Mode Bias Setting for Power Tubes Plate Current Meter ⑧ Power Tube Selector ③ ① ⑥ ② ④ ⑤...
NEVER wet the inside of this component with any liquid. If a liquid substance does enter your unit, immediately disconnect it from the AC mains and take it to your Aeron Dealer for inspection. NEVER spill or pour liquids directly onto this component.
“key” the tube pins to the socket holes. Retain the foam blocks with other packing materials for possible future use. If you are using the optional tube cover, be sure the AP990C is first turned off. Remove the top cover screws, and install the cover on top of the top plate. Insert...
If the unit is to be operated in an enclosed equipment cabinet, an exhaust fan is desirable so as not to operate the AP990C in overheated ambient air. The “ambient” operating temperature should never exceed 120...
Connect the black or “-” speaker terminal to the wire that connects to the “0” terminal on the AP990C. Connect the red or “+” speaker terminal to the wire that connects to the “4” or “8” terminal on the AP990C, and tighten the speaker terminals securely to ensure best sonic results.
If electronic crossovers or other AC powered equipment are used with the AP990C it may be necessary to use “ground lifter” adapters on the power plugs of that equipment to minimize system hum. Generally, the lowest hum is achieved when the only direct connection between audio common “ground”...
Operation Power-up Procedure Make sure you have read and complied with the Installation and Connection in- structions prior to attempting operation. Power-On 1. Adjust volume control to minimum setting 2. Press the “Power” button to turn unit ON 3. Choose the Audio Source, the source LED indicator is sparkling, wait 30secs to 1mins, till the LED is ON 4.
4. Turn on your preamplifier, turn on your AP990C. General Notes about Usage If you turn off the AP990C wait at least five minutes before turning it on again. This brief cool down period will reduce stress on the output tubes and potential damage to them.
INPUT: Allows selection of any of three single-ended input sources 1, 2, 3. Switch the input selector button through each input as indicated on the panel. POWER: Toggles power on and off from AC wall outlet to AP990C. Remote Control Functions 1.
3. After adjustment, all power tube’s switch need set to “OPERATE”, can play music now. *All power tube current adjustment as same. **For the best results, operate and adjust the AP990C at 220V AC. Adjustment must be made under zero-signal conditions after least 15-20 minutes of uninter- rupted stabilization time.
Maintenance Servicing CAUTION: Your AP990C contains sufficient levels of voltage and current to be lethal. Do not tamper with a component or parts inside the unit. Refer any need- ed service to your authorized Aeron dealer or other qualified technician. Should service be necessary, please contact your Aeron dealer, or Aeron Customer Service Email: info@lhe.com.hk or postmaster@stereoland.info.
The authorized importing retailer or distributor has accepted the responsi- bility for warranty of Aeron products sold by them. The specific terms and remedies for fulfillment of the Limited Warranty may vary from country to country.
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