background image

Input Stage

       

Input

Effects Loop Buffer

            

Effects Return

   

Send

Return

Line Out

Watts

Texture

Speaker

Pull Boost

Volume

Tone

Tone Stack

Depth

Send Level

Return Level

Voltage Amplifier

           

Cathode Follower

           

Phase Splitter

        

Output Tubes

Reverb Driver

Pull Deep

Reverb

Reverb Return

           

Spring

Tremolo

        

Fast/Slow

6V6

6V6

6V6

12AX7

12AX7

12AX7

12AX7

12AX7

12AX7

12AX7

12AX7

Speed

Tremolo

BLOCK DIAGRAM

-48

-6

-46

-44

-42

-40

-38

-36

-34

-32

-30

-28

-26

-24

-22

-20

-18

-16

-14

-12

-10

-8

d

20

20k

50

100

200

500

1k

2k

5k

10k

Hz

-48

-6

-46

-44

-42

-40

-38

-36

-34

-32

-30

-28

-26

-24

-22

-20

-18

-16

-14

-12

-10

-8

d

B

r

 

-48

-6

-46

-44

-42

-40

-38

-36

-34

-32

-30

-28

-26

-24

-22

-20

-18

-16

-14

-12

-10

-8

d

B

r

 

BOOST  — ON/OFF

14

13

Summary of Contents for Special 12

Page 1: ...12 20 Watt Hand Wired Vacuum Tube Guitar Amplifier User Manual VHT SPECIAL 12 20RT...

Page 2: ...plug this amplifier during lightning storms or when unused for long periods of time 13 Refer all servicing to qualified service personnel Servicing is required when the amplifier has been damaged in a...

Page 3: ...and tremolo while also fine tuning the output stage characteristics with the Depth and Texture controls To optimize the amp for a wide variety of output tubes the VHT Special 12 20RT offers two output...

Page 4: ...Reverb Tremolo footswitch 11 Pull Deep Pull this knob to add more low end depth to the reverb signal 12 Tone Control This control adjusts the balance of the high and low frequencies 13 Volume Control...

Page 5: ...d amplifier Several Special series amplifiers can be linked in this manner with the first amplifier s pre amp serving as the master preamp for all additional amplifiers 5 Impedance Selector This 3 pos...

Page 6: ...5 d B r 20 20k 50 100 200 500 1k 2k 5k 10k Hz 55 20 50 45 40 35 30 25 20 15 10 5 0 5 10 15 d B r TONE CONTROL PULL BOOST 55 20 50 45 40 35 30 25 20 15 10 5 0 5 10 15 d B r 20 20k 50 100 200 500 1k 2k...

Page 7: ...0 20k 50 100 200 500 1k 2k 5k 10k Hz 32 5 10 30 27 5 25 22 5 20 17 5 15 12 5 10 7 5 5 2 5 0 2 5 5 7 5 d B r TEXTURE SWITCH PREAMP INPUT NO BOOST 10 22 8 6 4 2 0 2 4 6 8 10 12 14 16 18 20 d B r 400 20k...

Page 8: ...2k 5k 10k Hz 10 22 8 6 4 2 0 2 4 6 8 10 12 14 16 18 20 d B r TEXTURE SWITCH EFFECTS RETURN INPUT 2 8 5 1 5 1 0 5 0 0 5 1 1 5 2 2 5 3 3 5 4 4 5 5 5 5 6 6 5 7 7 5 8 d B r 400 20k 500 600 700 800 900 1k...

Page 9: ...Reverb Driver Pull Deep Reverb Reverb Return Spring Tremolo Fast Slow 6V6 6V6 6V6 12AX7 12AX7 12AX7 12AX7 12AX7 12AX7 12AX7 12AX7 Speed Tremolo BLOCK DIAGRAM 48 6 46 44 42 40 38 36 34 32 30 28 26 24...

Page 10: ...A STB ON ON S3B S3C STBY TRIODE PENTODE 4 5 4 5 2 2 7 7 9 9 6 8V 12V C56 470u 16V T T NC JK1 9V DC OUT R73 100R R74 100R R72 220R D10 LED RED D5 1N4007 D6 1N4007 D8 1N4007 D7 1N4007 OUT G IN U1 7809 R...

Page 11: ...transferable by the Purchaser The warranty shall not apply to wearable parts these items include but are not limited to amplifier knobs feet and handles The warranty shall not apply if the product has...

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