Decware SE84UFO Owner'S Manual Download

Page: 14 / 18

OWNERS MANUAL for Model SE84UFO PAGE 14

Troubleshoo>ng

SYMPTOM

CAUSES

REMEDIES

Amp won’t turn on

Blown Fuse

Replace fuse

Power cord is not
pushed in all the
way or intermittent

Check power cord,
replace if necessary.

Tubes light up but
no sound

Rectifier tube is bad
even though it still
lights up

Replace rectifier tube.

Volume control is all
the way down.

Increase volume control
level

The source switch is
set to the wrong
source

Adjust the switch to the
other position.

Your source is not
playing

Start source

Interconnect cables
are unhooked

Reinstall interconnect
cables.

Incorrect tubes are
installed

Install correct tube types

tubes are installed
in the wrong
locations

Reinstall tube in the
correct locations.

Sound is real weak

Source switch set to
wrong source

Reduce volume and
Adjust source switch.

Sound is getting
weak

Tubes are past
rated life of 3000
hours

Replace tubes.

Sound drops out on
both channels and
comes back on

Power cord is loose

Check power cord,
replace if necessary.

Summary of Contents for SE84UFO

Page 1: ...Owner s Manual Model S E 8 4 U F O Stereo Power Amplifier ...

Page 2: ...utlet that is up to present day electrical code 6 Always maintain quick access to the power cord outlet so that the unit can be unplugged for emergency power disconnect 7 Always replace fuses with the same type and ra ng speciﬁed on the product s cker Defea ng the fuse or installing a fuse that is too large will void the life me warranty 8 Only install or replace tubes when the unit is oﬀ and the ...

Page 3: ...cement tubes such as those that shipped with the product are available from Decware Replace tubes every 3000 hours TUBE LOCATIONS RECTIFIER OUTPUT TUBE Right Chanel OUTPUT TUBE LeX Channel INPUT TUBE L R Channel Tubes should be carefully installed prior to hooking up your product Tube sockets can seem unusually ght when the product is new be sure to get the tubes worked down fully so that the base...

Page 4: ...re shorted together There is a HI LO switch next to each pair of speaker jacks on the ampliﬁer This is used to match the ampliﬁer to a given loudspeaker load It is operated while music is playing and selected by ear for the best sound The ampliﬁer will work ﬁne with the HI LO switch in either posi on regardless of speaker load however each sehng will make your speaker sound diﬀerent or perform diﬀ...

Page 5: ...e ampliﬁer s volume control somewhere between 1 2 way up and full Use the volume control on your preamp to adjust listening volumes This ampliﬁer requires 2 volts to come to full power 2 Volts is the average output signal level found in line level devices such as CD players and DACs This means that you will have to turn the volume control nearly all the way up to make the ampliﬁer clip run out of ...

Page 6: ... the air which is then re absorbed by the glass tubes causing worse sound than if no condi oner was used Excep ons are Isola on transformers such as the Triplite brand model ISO 500 or a power re generator Always try to avoid power strips or extension cords whenever possible as they can cause ground loops between your components resul ng in hum We recommend the ISO 500 when power condi oning is de...

Page 7: ...this ampliﬁer the 6N1P input tube and compa ble alternate such as 6922 6DJ8 7DJ8 6N23P 6H1N can all be operated at more than one bias point resul ng in diﬀerent sounds from each There is no right or wrong sehng for any of the above men oned tubes Simply listen to the amp with both sehngs and select the best one to your ears NOTE When opera ng the bias switch while the ampliﬁer is on you will hear ...

Page 8: ...R4 Output Tube Alternates EL84 6BQ5 1 Turn the volume control on the ampliﬁer all the way down 2 Turn on the upstream components ﬁrst such as your source and preamp if you re using one 3 Turn on the power ampliﬁer and wait 60 seconds for it to warm up and then slowly raise the volume control Tube Rolling Sequence of Opera on ON 1 Turn the volume control on the ampliﬁer all the way down 2 Turn oﬀ t...

Page 9: ...ee if the ampliﬁer sounds any beHer or stronger For example the two 6P15P EB output tubes can be replaced with a new set and then the ampliﬁer can be listened to If no substan al improvements are heard the new tubes can be returned to their boxes and the test can be repeated again in 6 months or whenever there is doubt The same can be done for the INPUT tube and the RECTIFIER tube Always have a fr...

Page 10: ...rts are capacitors and resistors which are all too easy to replace In the event that your ampliﬁer does need service please contact Decware so we can help you troubleshoot the amp by phone or make arrangements for the products return to Decware for inspec on and repair The life me warranty covers defects in materials and workmanship under normal use and opera ng condi ons Tubes have a separate 90 ...

Page 11: ...ts Power Consump on 65 WaHs Circuit Design Single Ended Triode Nega ve Feedback None THD 2 24 1 waH 20 20kHz 0 14 2nd H SNR 79dB HUM 64dB Tube Rec ﬁer 1 5U4 Output Tubes 2 EL84 or 6P15P EV Input Tube 1 6922 or 6N1P or 6DJ8 or 7DJ8 or 6H1N Size Dimensions 8 0 H x 6 125 W x 12 0 D Weight 17 lbs Fused 5 x 20 mm 3 AMP 120V or 1 6 AMP 240V Norm Temperature Transformer 139 F 80 F ambient room Speciﬁca o...

Page 12: ... used Re route cable away from power supplies and power cords or replace with shielded cable Digital Light Dimmer s on same circuit Turn off digital dimmers WIFI bridge or router nearby Locate farther away from audio components Hum from amp itself Chattering rectifier tube Tap on tube to see if chattering stops and if so replace rectifier tube Power transformer Poor voltage or over voltage at the ...

Page 13: ...el stops working No signal to that channel Take the cable from the channel that works and put it into the channel that stopped working If it starts working the amp is fine but you have either a bad cable or problem with your preamp or source component Speaker cable came unhooked Reinstall speaker cable Output tube failed Replace output tube Channel imbalance Output tubes no longer match Replace ou...

Page 14: ...e switch is set to the wrong source Adjust the switch to the other position Your source is not playing Start source Interconnect cables are unhooked Reinstall interconnect cables Incorrect tubes are installed Install correct tube types tubes are installed in the wrong locations Reinstall tube in the correct locations Sound is real weak Source switch set to wrong source Reduce volume and Adjust sou...

Page 15: ...ended transformers are used to ensure no transparency is lost in the output transformer itself Addi onally a triode circuit is used which is linear under a wide range of speaker loads so that it requires no ﬁdelity robbing nega ve feedback To ensure 2 waHs can drive diﬃcult speaker loads the primary impedance ra o for the output stage is much higher than normal so that when a speaker s impedance s...

Page 16: ... vast majority of us are unaware of true poten al of holographic imaging Even those of us lucky enough to witness really perfect rooms didn t hear it for the handicap of the mass produced retailed audio gear used for the demos Please invest some me in hun ng down the weak links in your audio chain as you enjoy the wonderful sound of this amp As you do you ll hear your amp again for the ﬁrst me and...

Page 17: ...an hook up a 4 ohm speaker or 8 or even 16 ohm speakers to a bridged amp To wire the ampliﬁer for mono two things have to happen 1 A signal must be fed into both input jacks usually accomplished with a Y Cable 2 The speaker jacks must be connected in series with a single piece of wire 10 to 12 inches long It connects between the leX posi ve and the right nega ve speaker jack on the ampliﬁer The tw...

Page 18: ...OWNERS MANUAL for Model SE84UFO PAGE 18 DATE INSTALLED TUBE TYPE TUBE replacement LOG ...

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