Hoffman Princeton Reverb Kurzanleitung

Intensity

250kl

Reverb

100kl

Bass

250ka

100k

Volume

1ma

12a

Treble

250ka

33k

V1-2

Ground Buss

Hoffman Amplifiers Princeton Reverb

2.7k

1n4007

DBA

www.hoffmanamps.com

V3 V5

1.5k

Speed

3mra

FeedBack Bias Range

Bias Tap

250p

.047

22/50v

1.5k

22/50v

1.5k

100k

.022

500p

3.3m

10p

22/50v

1.5k

.0033

22/50v

1.5k

100k

220k

100k/3w

1k/3w

100k

1 ohm

470/3w

1 ohm

22k

100k

V1-7

022921

Reverb send

To Tank Input 220k

Reverb Return to Tank Output and Foot switch jack

Vibrato Foot switch jack

RG174

Shielded

To Power

Transformer

Ground Lug

470k

2.2k/3w

22/50v

100k

.022

.01

.022

1m .022

220k

.1 56k

56k1k

6.8k

18k/3w

22/50v

3.3k

18k/3w

47/100v

10kl

OT OT

3.125" x 11.5"

FUSE

Lamp

6.3 vac

5 vac

Power Cord

White

Green

Black

To heaters

Speaker Jack

Power

Transformer

Output Transformer

1 Amp slo-blo

On/Off

Switch

Standby

Bias Tap

D BC

+ +

20uf 500v

+ +

40uf 500v

Pin 3

FeedBack

Power Transformer

Ground Lug

Board Connections

Optional

Clickable Links

EL34 World Tube amp Library page

Hoffman Amplifiers parts catalog

Hoffman Layout diagram hookup information www.hoffmanamps.com

Hoffman princeton Reverb

Board A

20uf 500v

R26

3.3M

C13

.022 C14

10p

V3-B

R27

100k C15

.022

R32

2.2K

C18

22uf

R31

C17

500p Reverb Tank

4AB3C1B

C20

22uf

R35

1.5k

R33

220k

R34

100k C19

.0033 REVERB

R36

100kL

R37

470k

REVERB

FOOTSWITCH

161

2 7

3 8

V3-A

V2-BV2-A

R28

1.5k C16

22uf

To PHASE

INVERTER

R20

250ka

250p

C10

.047

R19

100k

R18

1.5k

R17

100k

V1-A

22uf

R21

250ka

TREBLE R23

1ma

VOLUME

BASS

R24

100k

R25

1.5k C12

22uf

V1-B

PREAMP and REVERB

12AT7

REVERB

DRIVER

12AX7

REVERB

RECOVERY

68k

(1)

(2)

Dual Input Jacks

J1 –J2

33k

12AX7

022921

J7 J8

DD D

Hoffman Princeton Reverb

www.hoffmanamps.com

Reverb channel

SW4

Thanks to Sluckey on the Hoffmamps forum for creating the original schematic

R22

6.8k

R29

Feedback

+++

+ +

6.3 VAC

5 VAC

R69

18k / 3w R70

18k / 3w

R64

250kl

POWER AMP, TREMOLO

and POWER SUPPLY

C15

.022

R43

1m R41

C25

R50

1.5k

R48

220k

C24

R47

220k

R40

56k R49

1.5k

R51

2.7k

R52

1Ω

R53

1Ω

R54

470/3w

R55

470/3w

SPEAKERS

V4-B

From

PREAMP

5U4G

R56

3mra D1

1N4007

R65

10kl

R66

22k R67

100k/3 watt

C32

47uf

V4-A

BIAS SUPPLY

C30

C31

.022

R63

R58

220k

R59

R61

3.3k C29

22uf

R60

C28

.01

C27

.01

C26

.022

R57

100k

TREMOLO

FOOT

SWITCH

12AX7

TREMOLO

OSCILLATOR

12AX7

PHASE

INVERTER

POWER

AMPLIFIER

ABD

SPEED INTENSITY BIAS

BIAS RANGE

R71

100

R72

100

Lamp

LED

NEUTRAL

LINE

GROUND

1 amp

SLO BLO SW1

SW2

SW5

Heaters

C34

40uf C35

20uf C36

20uf C37

20uf

www.hoffmanamps.com

J10

Thanks to Sluckey on the Hoffmamps forum for creating the original schematic

Feedback

R42

56k

Hoffman Princeton Reverb

Optional

Standby

switch

R68

1k / 3w

++ + +

Multi Section Filter Cap

40x20x20x20 / 475v

DBA

10kl

Hoffman Amplifiers Princeton Reverb www.hoffmanamps.com

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