DYNACO Stereo 80 Manuale del Proprietario

Stereo 80Vacuum Tube AmplifierOwner's ManualStereo 80 Vacuum Tube Power AmplifierOFFONBIAS DISPLAYTRIODEULTRALINEARPOWER ONPOWER OFFRSTEREO 80Vac

Burn-In Procedure for New Output TubesNote: This procedure applies only when you have installed new output tubes which have not yet beenburned-in.

Tube ReplacementCAUTION: Before replacing tubes on your Stereo 80 ensure the AC power cord is un- plugged fromits AC (wall) outlet (or that the AC p

Tube Replacement (cont.)Input and Driver TubesThe input and driver tubes in your Stereo 80 could provide 5,000 to 10,000 hours of use.

Alternate Tube TypesIt is true that vacuum tubes made by different manufactures can actually sound different. The amount andtype of sonic differences

Minimizing Noise in the SystemHum is caused by amplification of the 50 or 60 Hz AC power line signal that is transmitted via themag

WarrantyFor three years from the date of purchase (one year for tubes) Dynaco will repair, for the original owner,any defect in materials or workmansh

Stereo 80 SpecificationsPOWER OUTPUT 40W per channel into 2, 4, or 8 ohmsPOWER BANDWIDTH: 40W from 17Hz to 75kHz (-3dB points)THD < 1% @ full powe

C3C5BC2R19R9R4R12M.47uF.22uF2.0K100pF/400v1/2 12AT7498763211MV1630VR101239301LEFTINPUTR230100601P 1 3STEREO 80 AUDIO SECTION3 MAR 95 OFREV PAGE DWG#R

00601P 2 3STEREO 80 POWER SUPPLY SECTION3 MAR 95 OFREV PAGE DWG#270uF7A / 100VT1SW1100F1120 VAC X 250/60 Hz(100V TAP)BRNBRN/WHTWHTBLKBLK/WHT3.5A / 22

00601P 3 3STEREO 80 BIAS ADJUST & INDICATORS3 MAR 95 OFREV PAGE DWG#SW2ULTRALINEARTRIODED10LED5R751K 1KR76LED6P325K25KP4R71R7239K39KV3 BIAS ADJUS

ContentsIntroduction ... 3Vacuum Tube Warm Up ...

Stereo 80 PC Board Parts ListResistors39 ohm, 1/2W, metal film R22049 ohm, 1/2W, metal film R4, 104100 ohm, 1/2W, metal film R201A, 201B127 ohm, 1/2W,

Stereo 80 PC Board Parts List (cont.)Semiconductors2.5A, 1KV D1 through D111N5242B (12V, 1/2W Zener) ZD1, 4, 7, 101N 5388 (200V, 5W Zener) ZD2, 3, 5,

IntroductionCongratulations on your purchase of the Dynaco Stereo 80 Amplifier. This product wasdesigned to provide the highest combination of quality

Vacuum Tube Warm-UpAlthough a vacuum tube power amplifier begins to work in as little as 15 seconds after being switched on,it is important to allow a

Input Sensitivity SettingThe Input Sensitivity adjustment is located on the rear panel, to the right of the input RCA jacks. Thisfeature allows you t

Power On/Off Indicators and FuseThe Stereo 80 Power On/Off indicator is either the Ultralinear (red) lamp or the Triode (amber) lamp.The lamp which is

Triode/Ultralinear ModesThe Ultralinear mode is usually considered to be the “normal” mode of operation. The overall powerrating of the amplifier is

Bias Adjustments - generalThe Stereo 80 incorporates integrated circuits that monitor the actual quiescent (idle) current of eachoutput

Output Tube Bias Adjustment Procedure1) Warm up amplifier for 15 minutes (or more).2) Turn off any equipment connected to the amplifier inputs and e