DIY VACUUM TUBE PREAMPLIFIER


CAUTION! HIGH VOLTAGE!
Observe safety precautions when working with high voltage!


"Golden Middle" reserves the right to make changes in products
not affecting the basic technical characteristics.





NEW!


Hi-Fi VACUUM TUBE PREAMPLIFIER "PRETON"

James tone correction
Bass 100 Hz
Treble 10 000 Hz.
All potentiometers on PCB board of preanm can be replace
to the types of all sizes (5) such as RK 16...27 (ALPS Blue Velvet).
This preamp can be used as a componet of any audio system.



DIY VACUUM TUBE PREAMPLIFIER PRETON DIY VACUUM TUBE PREAMPLIFIER PRETON

"PRETON" curcuit diagrampreamp curcuit diagram



DIY "PRETON 1":

TECHNICAL SPECIFICATIONS :

Vacuum tubes: 6N5P 2 pcs; 6N23P 1 pcs
Amplification factor (1 KHz): 12,5 db (4,2 times)
Normal input voltage: 775 mV
Output voltage @ 1 KHz: 3,25 V
Normal input resistance: 50 KOhm
Min output resistance: 600 Ohm
Nominal load: 5 KOhm
S/N ratio not more -74 db
Tone control response
100 Hz (min max) -12 - 0 - + 10 db
10 KHz (min max) -12 - 0 - + 10 db
Max differ of the line frequency response in the tone control position 0: 1,5 db
THD @ 2,5 V out 6 KOhm load:
tone control ON not more 0,08%
tone control OFF not more 0,03%
Max input voltage: 3,5 V
Max output voltage @ THD 0,5 %: 14,7 V

DIY Hi-Fi vacuum tube preamplifier PRETON

 power supply STABILIGHT

DIY "PRETON 1" :

Vacuum tubes: 6N5P 2 pcs; 6N23P 1 pcs;
2 pcs of collected and adjusted PCBs from a fiberglass (thickness 2 mm) :
PCB of preamp 280 mm 90 mm and PCB of power supply "STABILIGHT" 85 mm 90 mm;
ALPS potentiometrs;
Signal polypropylene and polystirol (K71-7) capacitors;
Jamicon electrolytic capacitors;
CD with instructions;
Input and output sockets.

The PCBs are fully adjusted and tested.
The independent assembling consists in fixing of PCBs on a screening surface / in a case
and connecting of sockets.



DIY "PRETON 2"

TECHNICAL SPECIFICATIONS :

Vacuum tubes: 6N1P 2 pcs; 6N23P 1 pcs
Amplification factor (1 KHz): 17 db (7 times)
Normal input voltage: 775 mV
Output voltage @ 1 KHz: 3,25 V
Normal input resistance: 50 KOhm
Min output resistance: 600 Ohm
Nominal load: 5 KOhm
S/N ratio not more -74 db
Tone control response
100 Hz (min max) -12 - 0 - + 10 db
10 KHz (min max) -12 - 0 - + 10 db
Max differ of the line frequency response in the tone control position 0: 1,5 db
THD @ 2,5 V out 6 KOhm load:
tone control ON not more 0,08%
tone control OFF not more 0,03%
Max input voltage: 5,4 V
Max output voltage @ THD 0,7 %: 24,5 V

DIY Hi-Fi vacuum tube preamplifier PRETON

 power supply STABILIGHT

DIY "PRETON 2":

Vacuum tubes: 6N1P 2 pcs; 6N23P 1 pcs;
2 pcs of collected and adjusted PCBs from a fiberglass (thickness 2 mm) :
PCB of preamp 280 mm 90 mm and PCB of power supply "STABILIGHT" 85 mm 90 mm;
ALPS potentiometrs;
Signal polypropylene and polystirol (K71-7) capacitors;
Jamicon electrolytic capacitors;
CD with instructions;
Input and output sockets .

The PCBs are fully adjusted and tested.
The independent assembling consists in fixing of PCBs on a screening surface / in a case
and connecting of sockets.



DIY "PRETON 3"

TECHNICAL SPECIFICATIONS :

Vacuum tubes: ECC82 2 pcs; ECC88 1 pcs;
Amplification factor (1 KHz): 11 db (3,5 times)
Normal input voltage: 775 mV
Output voltage @ 1 KHz: 2,7 V
Normal input resistance: 50 KOhm
Min output resistance: 600 Ohm
Nominal load: 5 KOhm
S/N ratio not more -74 db
Tone control response
100 Hz (min max) -12 - 0 - + 10 db
10 KHz (min max) -12 - 0 - + 10 db
Max differ of the line frequency response in the tone control position 0: 1,5 db
THD @ 2,5 V out 6 KOhm load:
tone control ON not more 0,1%
tone control OFF not more 0,06%
Max input voltage: 3,5 V
Max output voltage @ THD 0,5 %: 12,25 V

DIY Hi-Fi vacuum tube preamplifier PRETON DIY Hi-Fi vacuum tube preamplifier PRETON

DIY "PRETON 3":

Vacuum tubes: ECC82 2 pcs; ECC88 1 pcs;
2 pcs of collected and adjusted PCBS from a fiberglass (thickness 2 mm) :
PCB of preamp 280 mm 90 mm and PCB of power supply "STABILIGHT" 85 mm 90 mm;
ALPS potentiometrs;
Signal polypropylene and polystirol (WIMA) capacitors;
Jamicon electrolytic capacitors;
CD with instructions;
Input and output sockets .

The PCBs are fully adjusted and tested.
The independent assembling consists in fixing of PCBs on a screening surface / in a case
and connecting of sockets.


DIY "PRETON 4"

TECHNICAL SPECIFICATIONS :

Vacuum tubes: 6N1P 2 pcs; 6N23P 1 pcs
Amplification factor (1 KHz): 17 db (7 times)
Normal input voltage: 775 mV
Output voltage @ 1 KHz: 3,25 V
Normal input resistance: 50 KOhm
Min output resistance: 600 Ohm
Nominal load: 5 KOhm
S/N ratio not more -74 db
Tone control response
100 Hz (min max) -12 - 0 - + 10 db
10 KHz (min max) -12 - 0 - + 10 db
Max differ of the line frequency response in the tone control position 0: 1,5 db
THD @ 2,5 V out 6 KOhm load:
tone control ON not more 0,08%
tone control OFF not more 0,03%
Max input voltage: 5,4 V
Max output voltage @ THD 0,7 %: 24,5 V

DIY Hi-Fi vacuum tube preamplifier

DIY "PRETON 4":

Vacuum tubes: 6N1P 2 pcs; 6N23P 1 pcs;
2 pcs of collected and adjusted PCBs from a fiberglass (thickness 2 mm) :
PCB of preamp 280 mm 90 mm and PCB of power supply "STABILIGHT" 85 mm 90 mm;
ALPS potentiometrs;
Signal polypropylene and polystirol (WIMA) capacitors;
Jamicon electrolytic capacitors;
CD with instructions;
Input and output sockets .

The PCBs are fully adjusted and tested.
The independent assembling consists in fixing of PCBs on a screening surface / in a case
and connecting of sockets.




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