Bellari BA525 Manual

Bellari Ikke kategoriseret BA525

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Side 1/4

BA525 Tube Bu󰀨er

SPECIFICATIONS

Tubes: 12AX7

Input Impedance: 470K ohms

THD: 0.09%

S/N Ratio: 102 db, unweighted

Indicator: 1 Power LED

Frequency Response: 7 Hz - 129 KHz +0 db / -.3 db

Crosstalk: -91 dB

Output impedance: 10K Ohms

Output Connector: RCA Stereo jack

Input Connectors: RCA Stereo jack

PWR: 15 VDC 500mA

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

Weight: 2 lb.

Active Power

Input Output

Power

BA525

Tube Buffer

Connection guide

Salt Lake City, UT

7/25

What's in the box?

1 - Made in USA BA525

1 - 15V power supply PN PS27s

1 - This owners manual

1 - Love for great audio

Thank you for purchasing the BA525. We hope it enhances

your enjoyment of your music collection and delivers a truly

rewarding listening experience. We're honored to have the

opportunity to craft this product for you and to be part of your

passion for high-quality music and sound. At Bellari, we love

what we do and are always here to help. Every Bellari prod-

uct is hand-built with care in Salt Lake City, Utah by people

who are dedicated to exceptional sound.

CONNECTION INSTRUCTIONS:

Connect your audio source or preamplier to the BA525 us-

ing the RCA input jack stereo input.

Plug the included PS27s power adapter into the jack labeled

“power” Do not use any other power supply, as doing so may

damage the unit and require repair.

Connect your amplier or preamplier to the BA525’s RCA

output jack.

Sit back and enjoy your music.

The BA525 features two 12AX7 tubes operating at 150

volts—one for the left channel and one for the right. The

input signal is fed directly to the grid of each tube, with

all amplication provided exclusively by the 12AX7s. The

BA525 uses a pure analog design with no feedback circuitry

or integrated circuits in the audio path, ensuring a clean and

natural sound.

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

A: Yes, di󰀨erent tubes can produce di󰀨erent gain levels. If you

replace the 12AX7 tubes in the BA525 with other 12AX7 variants,

you may notice a change in output level. For instance, using a

5751 (also known as 12AX7WA), which has a gain factor of 70

compared to the 12AX7's gain factor of 100, will result in notice-

ably lower gain. Even among di󰀨erent brands of 12AX7 tubes,

slight variations in gain can occur, and you may hear subtle di󰀨er-

ences in sound.

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

A: Yes, some tube brands perform better than others in certain

areas. In our testing with the BA525, the best results came from

a N.O.S. 1960s Mullard long plate 12AX7 made in Great Britain.

It signicantly improved total harmonic distortion (THD), though

crosstalk remained unchanged due to the BA525’s use of indepen-

dent tubes for each channel. For most tubes, frequency response

and signal-to-noise ratio are very similar.

The downside of the Mullard is its cost—around $220 when pur-

chased from a reputable source. That said, the included 12AX7 is

a great-sounding tube with a smooth, rich bass response. Swap-

ping tubes can be fun for experimentation, but it’s denitely not

required. All published specs for the BA525 are based on the stock

12AX7.

TUBE TEMPERATURE:

The tubes in the BA525 typically reaches around 140°F, making it

warm to the touch. As a result, the top of the chassis will also warm

up—usually about 25°F above room temperature. After a few hours

of use, the chassis may feel hot, but this is completely normal and

not a cause for concern.

Some tubes naturally run hotter than others. In our testing, the

warmest tube was a NOS RCA 5751 made in Canada, which

reached about 147°F. It caused the top of the BA525 to feel notice-

ably warmer after extended use, but again, this is expected and

poses no issue.

Produkt Specifikationer

Mærke:	Bellari
Kategori:	Ikke kategoriseret
Model:	BA525

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