Bellari PA555 Manual

Bellari Modtager PA555

Læs gratis den danske manual til Bellari PA555 (4 sider) i kategorien Modtager. Denne vejledning er vurderet som hjælpsom af 24 personer og har en gennemsnitlig bedømmelse på 4.7 stjerner ud af 12.5 anmeldelser. Har du et spørgsmål om Bellari PA555, eller vil du spørge andre brugere om produktet?

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Side 1/4

PA555 Preamplier

SPECIFICATIONS

Input Impedance: 10K ohms

Max Output Gain: 11.1 dB

THD: 0.1%

S/N Ratio: 103 db, unweighted

Indicator: 1 Power LED

Frequency Response: 5 Hz - 198 KHz +/- 3 db

Crosstalk: -75 dB

Output impedance: 100 Ohms

Output Connector: RCA Stereo

Input Connectors: 1: 1/8" TRS Stereo jack

3: RCA Stereo jacks

PWR: 15 VDC 500mA

Size: 6"w x 2.5"h x 5.4"d

Weight: 2 lb.

OUT

PA555

MADE IN USA

IN 1

15 VDC

Power

Preamplifier

PA555

Preamplifier

Connection guide

Salt Lake City, UT

4/19

What's in the box?

1 - Made in USA PA555

1 - 15V power supply PN PS27s

1 - This owners manual

1 - Love for great audio

Thank you for purchasing the PA555. We hope you enjoy

using the PA555, and that it makes listening to your music

collection rewarding. We sincerely appreciate the opportunity

to build a product for you and participate in your love of qual-

ity music and sound. We love what we do and we’re happy

to help. All Bellari products are hand built in Salt Lake City,

Utah by people who care about high quality music.

TUBE TEMP:

The tube will get up to around 140 degrees fahrenheit, it will

be warm to the touch. The top chassis will also get warm

from the tube's heat. This will not be an issue as the chassis

will only get 20 degrees warmer than room temp. The entire

top of the chassis will seem hot after the PA555 has been on

for a few hours, this is normal and nothing to be concerned

about. Some tubes do run hotter than others. In our testing

the hottest tube we have seen was a NOS RCA 5751 made

in Canada it ran at 147 degrees, and did make the top of the

PA555 very warm to the touch after being on for a few hours.

This is normal and is not a cause for concern.

CONNECTION:

1 - Connect your sources to the PA555's “in” RCA

jacks on the back or 1/8" stereo jack on the front.

2 - Connect the supplied PS27s adapter to the

jack labeled “15VDC”. Do not use any other

adapter, or the unit might be unhappy, and you would need

some repair work done.

3 - Connect your amplier to the "OUTPUT" RCA jacks, se-

lect the channel you want.

4 - Enjoy your music.

The PA555 uses one 12AX7 tube running at 150 volts. The

input signal is connected directly to the grid of the tube and

all of the gain of the PA555 is from the 12AX7 tube. The out-

put section is a pair of emitter followers to drive the output.

The PA555 has a no feedback circuit or integrated circuits in

the audio path, it is all analog.

Q: Do di󰀨erent tubes have di󰀨erent gain?

A: Yes, but it is not a big enough di󰀨erence to worry about.

With a 12AX7 the PA555 has 11.1 dB of gain. With a 5751

the PA555 has 10.7 dB of gain. Even though the 12AX7 has

a gain factor of 100 and the 5751 (12AXWA) has a gain fac-

tor of 70 the slight decrease in max gain will not be notice-

able as the PA555 has more gain than most preamps. Even

di󰀨erent brands of tubes will have a slightly di󰀨erent gain, but

it is so small you will not hear a di󰀨erence.

Q: Do di󰀨erent tube brands have di󰀨erent specs?

A: Yes, some tubes have better specs than others. The best

tube we tested for specs in the PA555 was a N.O.S. 1960's

Mullard long plate made in Great Britain 12AX7. The THD

was improved quite a lot in our testing. The crosstalk also im-

proved. With most all tubes the frequency response and sig-

nal to noise ratio will be about the same. The bad news about

the Mullard tube is it is about a $180 tube if purchased from

a reputable tube seller. The included 12AX7 is a wonderful

sounding tube with very smooth response. Changing tubes

can be fun, but by no means necessary. The specs given for

the PA555 are with the included 12AX7.

Produkt Specifikationer

Mærke:	Bellari
Kategori:	Modtager
Model:	PA555

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