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Vintronics Classic 25, User Manual, Page: 10 / 10

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Vintronics Classic 25 User Manual Download Page 10

 
 
 
 

 

VOLTAGE MEASUREMENTS ON THE CLASSIC 25 

 

1 

Voltage Tolerances should be /- 15% of those stated below. 

2 

All voltages are DC with respect to Ground unless otherwise stated. 

 
 

TEST 

POINT 

 

VOLTS 

DC VOLTAGES FOR 25 VOLTS PK-PK AT 8 OHM AT 
1KHZ SINE WAVE  

TP1 

220 

3.5V PK - PK 

TP2 

1.8 

 

TP3 

3.5 

 

TP4 

120 

3.5V PK - PK 

TP5 

4.4 

 

TP6 

4.4 

 

TP7 

108 

35V PK - PK 

TP8 

108 

35V PK - PK 

TP9 

22 

15Mv ripple at 100Hz  ( no signal) 

TP10 

22 

15Mv ripple at 100Hz  ( no signal) 

TP11 

337 

350V PK – PK 

TP12 

337 

350V PK – PK 

TP13 

338 

150V PK - PK 

TP14 

338 

150V PK - PK 

TP15 

283 

Negligible ripple 

TP16 

308 

10mV Ripple @ 100Hz 

TP17 

339 

800mV Ripple @ 100Hz 

TP18 

9.45 

 

TP19 

3.2 

AC VOLTAGE 

TP20 

3.2 

AC VOLTAGE 

TP21 

3.2 

AC VOLTAGE 

TP22 

3.2 

AC VOLTAGE 

TP23 

350 

 

 

 

 

 

 

 

 

 

Summary of Contents for Classic 25

Page 1: ...n and build standard Heavy rubber feet act as sound absorbers to protect against microphony of the valves Local companies have been used to provide the parts for this amplifier The power amplifier is based around two pairs of EL34 6CA7 tetrode output valves operating in a pure Class A push pull output configuration The output transformers have been specially designed and wound to our specification...

Page 2: ... Signals from this stage are then fed into the EL34 push pull output stage Full power supply voltage is applied to these valves to maximise output power Conversion of the high voltage signal is then done in the output transformers They convert the high impedance high voltage into low impedance high current drive to the loudspeakers The input phase splitter and driver valves are separately heated f...

Page 3: ...etter than 80dB Frequency Response 25 Hz to 25 KHz 0 9dB 0 8dB Power consumption 180 Watts Loudspeaker Loads 4 Ohm 8 Ohm Valves 2 x ECC82 3 x ECC83 4 x EL34 6CA7 Input Sensitivity 0 7V RMS Connections Inputs 4 x RCA Phono Outputs 2 x 4mm Terminal Posts Power IEC Mains inlet Weight 10 3 Kilos Dimensions 420 x 290 x 150 mm High TYPICAL VALUES MEASURED WITH LINDOS LA101 2 TEST SET ...

Page 4: ... 3dB 3dB 0 10 20 30 40 50 60 70 80 90 100 200 500 1K 10K 11 12 13 14 15 16 17 18 19 20K FREQUENCY RESPONSE ...

Page 5: ...two output Impedances 4 ohm and 8 ohm Choose the output connection which best suits your speakers Normally speakers are marked with their impedance and this can be measured with an Ohm meter So the loudspeaker would connect to the Black negative terminal and either the yellow 4Ω or red 8Ω terminal Use generous guage cable to the loudspeakers This will aid with losses between the amplifier output a...

Page 6: ...se try and use the highest quality manufacturer of the valves Limited One Year Warranty This product is warranted to be free from defects in materials or workmanship for a period of one year from the date of purchase by the original owner To ensure a high level of performance and reliability for which this equipment has been designed and manufactured read the user guide before operating In the eve...

Page 7: ...d moisture To reduce the risk of fire or electric shock do not expose the amplifier to rain or moisture or use it in damp or wet conditions Do not place containers of liquids on it which might spill into any openings Ventilation Do not obstruct the ventilation slots or position the amplifier where the air flow required for ventilation is impeded If the amplifier is to be operated in a rack unit or...

Page 8: ...TED RESPONSE MEASURED AT OUTPUT TERMINALS AT 10 WATTS RMS OUTPUT INTO 8 OHM LOAD 30Hz 100Hz 400Hz 1KHz 6KHz 10KHz 15KHz 20KHz DISTORTION MEASURED AT 10 WATTS OUTPUT INTO 8 OHM LOAD 1KHz 100Hz CROSSTALK MEASURED AT 10 WATTS OUTPUT INTO 8 OHM LOAD 1KHz 10KHz ...

Page 9: ...ngage with the pip is acceptable The valve is then pushed home into the socket carefully FOR EXPERIENCED QUALIFIED PERSONS ONLY If you have the necessary test equipment then remove the top plate from the Amplifier to expose the circuitry EXTREME CAUTION is required as there are FATAL VOLTAGES within the Amplifier unit Adjust the trimmer resistor R with a trimmer tool to obtain true linearity of a ...

Page 10: ...E TP1 220 3 5V PK PK TP2 1 8 TP3 3 5 TP4 120 3 5V PK PK TP5 4 4 TP6 4 4 TP7 108 35V PK PK TP8 108 35V PK PK TP9 22 15Mv ripple at 100Hz no signal TP10 22 15Mv ripple at 100Hz no signal TP11 337 350V PK PK TP12 337 350V PK PK TP13 338 150V PK PK TP14 338 150V PK PK TP15 283 Negligible ripple TP16 308 10mV Ripple 100Hz TP17 339 800mV Ripple 100Hz TP18 9 45 TP19 3 2 AC VOLTAGE TP20 3 2 AC VOLTAGE TP2...

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