Full Music 2A3 tube (sold)

 Full Music 2A3 tubes. SOLD

 

 

Sophia Electric 300B tube (sold)

 Sophia Electric 300B/n tubes. SOLD

 

Ultron 5V4G/GZ32 Rectifier tube (sold)

Ultron 5V4G/GZ32 Rectifier tube. NOS New in original box.

Tested very strong as new tube. 8 tubes available

 Selling for : SOLD

Interested please contact Alan 016-5576846

 

Mullard GZ32 Rectifier tube (sold)

 Mullard GZ32 rectifier tube. NOS in original box.

Tested very strong as new tube. Unused in opened box.

Made in Great Britain.

Selling for SOLD 

Interested please contact Alan 016-5576846

HOLFI BATTRIAA BATTERY POWER PHONO MM/MC PRE AMP

BATTERY driven RIAA.

As indicated by the name BATTRIAA is a RIAA amplifier with battery power

supply. BATTRIAA contains two 12 Volt/2.9 Ampere hours sealed and

maintenance free batteries. The use of battery operation secure the lowest

possible level of noise. In practise 20 dß lower than solutions based on

active regulation. Just noise is a parameter, which is extremely important

for an amplifier that has to maintain the low and extremely vulnerable

signal from a cartridge. That the battery power supply is not surpassed by

any conventional power supply can be seen by the fact that the quite small

batteries inside BATTRIAA can deliver more than 50 Ampere for several

seconds. The automatic charger makes sure the batteries are always on top,

which secures a battery life span of minimum 5 years. When the batteries

turn old, they gradually loose their good abilities. Consequently HOLFI

recommends a battery change every 5 - 8 years. A change of batteries will

cost less than one/tenth of the price of the BATTRIAA.

 

The RIAA amplifier from Pre NB1.

The components in BATTRIAA are identical to those used in HOLFI's State of

The Art preamplifier Pre NB1. These components have been chosen purely from

sound quality point of view. The circuitry design, the battery operation and

the WBT phono sockets are the same as used in Pre NB1. The MC stage

amplifies the current signal from the cartridge instead of (as normally

seen) the voltage signal. MC cartridges deliver a very low voltage signal,

but as a current producer they deliver as much as MM cartridges. Considering

the fact that bipolar transistors are current producing components, it seems

obvious to utilize the current amplification along with MC cartridges. This

will give the lowest possible distortion and noise. The amplification in the

MC stage can be varied in 4 steps, which means that BATTRIAA practically can

be used optimally with any cartridge. Like all HOLFI amplifiers BATTRIAA is

totally without global feedback to secure a homogenous and easy flowing

musical reproduction. The implemented RIAA correction is featuring chosen

and measured coal resistors as well as copper foil capacitors to ensure the

highest possible precision as well as the optimum sound quality.

 

State of The Art.

The sound quality from BATTRIAA must be experienced. Besides not being

behind any other RIAA amplifiers as to openness, richness in details and

dynamics, BATTRIAA sets new limits to authentic sound and quietness in the

sound stage.

 

Technical data:

Size - weight : 45,0 x 33,0 x 8,0 - 16 lbs.

 

Current consumption : 6W, 240 VAC

 

Inputs: MC : 0,05 mV / 10W p.u. , MM : 2,5 mV / 47kW // 200 pF

 

THD : <0,2% / 1 Vrms

 

Max output : 4 Vrms (1% THD)

 

Frequency range : 8 Hz - 1,3 MHz +0 / -3 dB

"The gain in the Battriaa is very much dependent on the individual cartridge

because of the current amplification. As such two cartridges with very

different output in mV can have opposite gain when handled by the Battriaa.

 

If you compare the clearaudio with 0.7 mV with an Ortofon Rohmann with only

0.25 mV outut, then the final output from the Ortofon cartridge is much much

higher as the internal impedance of the Ortofon is only 5 Ohms versus 50

Ohms for the Clearaudio.

 

Clearaudio: 0.7 mV / 50 Ohms = 14 uA

Ortofon: 0.25mV / 5 Ohms = 50 uA

 

As such output from the Ortofon is 10 dB higher than the Clearaudio!

 

When you play the Ortofon Rohmann, then you should set the gain in the

Battriaa at minus 10dB and the Clearaudio at max gain.

 

In general the Battriaa supports cartridges with low internal impedance the

best.

 

Low internal impedance equals low moving mass on the coil and as such you

can have higher sound quality with low impedance cartridges.

 

Audio Note Cartridges offers only 0.05 mV output, but also only 1 Ohm

internal impedance. As such output current is 50 uA, which again is 10 dB

higher than the Clearaudio cartridge!

 

By traditional amplification of voltage the Clearaudio is 23 dB higher

output than Audio Note.

 

Then why is the Battriaa operating with current amplification? The small

signal bipolar transistor by nature operates as a current amplification

device and as such you have the most linear and noise free amplification

ever possible - and of course the best sound quality ever possible.

 

The Battriaa gain:

 

MC ( 5 Ohms cartridge impedance) : 74 dB gain

MC (10 Ohms .....) : 68 dB gain

MC (20 Ohms .....) : 62 dB gain

MC (40 Ohms .....) : 56 dB gain

 

Most cartridges likes to operate with current amplification no matter the

internal impedance. As such high output moving coil cartridges having i.e. 2

mV output and 150 Ohms internal impedance sounds better when they are

handled by the MC stage rather than the MM stage of the Battriaa.

 

Only cartridges with very low output combined with high internal impedance

can cause a mismatch with the Battriaa ( i.e. old Denon cartridges like the

DL 1000 having only 0.1 mV and 40 Omhs internal impedance)."

 

ASKING FOR RM3700.00

WHATSAPP KT 0195941098