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Bluetone Melissa Preamp schematics. ½ 12AX7. ½ 12AX7. B3. 340V DC. 100 kohm. 820 pF. 220 kohm. 1 Mohm. 4,7 nF. Preamp out. 470ohm. 150 kohm. To PI/2. 1,0 uF. 47 pF. 10 nF. 150 kohm. Input. 330 kohm. 1M log. 220 nF. 2,2 nF. Level. 1,0 uF. Middle. 33 kohm. 100 nF. 1Mohm.

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bluetone melissa preamp schematics
Bluetone Melissa Preamp schematics

½ 12AX7

½ 12AX7

B3

340V DC

100 kohm

820 pF

220 kohm

1 Mohm

4,7 nF

Preamp out

470ohm

150 kohm

To PI/2

1,0 uF

47 pF

10 nF

150 kohm

Input

330 kohm

1M log

220 nF

2,2 nF

Level

1,0 uF

Middle

33 kohm

100 nF

1Mohm

22 uF

220nF

270 kohm

1 Mohm

1,5 kohm

4,7 nF

470 nF

150 kohm

Gain

2,2 nF

15 kohm

100 kohm

Bass

Bright

50 kohm

50 kohm

Harry Kneckt

8.2.2007

bluetone melissa power amp and power supply schematics
Bluetone MelissaPower amp and power supply schematics

12AX7

B2

Volume Dual-Gang

OT Hammond 1620

1 Mohm

22 kohm

100 kohm

100 kohm

330 ohm

Treble

220 kohm

47 nF

47 nF

1 Mohm

B1

B2

4,7 nF

1 Mohm

220 kohm

330 ohm

Power amp in

22 kohm

Power tubes 6V6GT

100 kohm

22 nF

250 ohm 5W

270 kohm

33 kohm

25 uF

PT 2x325V 150mA 6,3V 5A, 5V 3A

2x100 ohm

Heaters 6,3 V AC

380 V

360 v

340 V

B1

B2

B3

Stand by switch

5Y3/GZ34

230 V AC

100 ohm

4,7 kohm

10 kohm

2x325VAC

Harry Kneckt

8.2.2007

Fuse 1,2 A

20 uF

40 uF

20 uF

20 uF

5 V

bluetone melissa voltage chart
Bluetone MelissaVoltage chart

V1(12AX7)

1= 148 V

3= 1,1 V

7= 38,3 V

6= 206 V

8=

V2(12AX7)

1= 257 V

2= 70,7 V

3= 73,1 V

6= 250 V

7= 60,9 V

8= 73,1 v

V3(6V6GT)

3= 398 V

4= 365 V

8= 21,4 V

V4(6V6GT)

3= 398 V

4= 365 V

8= 21,4 V

Preamp 100 kohm trimmers are used

to adjust bias to V1/7 and V2/2

Harry Kneckt

8.2.2007