Hybrid Amp Rev A - The Blue Guitar

1M .01uF. 10k. 270pF. 4M7. B+5. 47pF. 100k (opt). 12AX7. OD1. 68k. B+4. 100kA. Drive. 100k. 12AX7. OD2. Rp(OD2). 180k. B+4. 100kA. 3k3. 5.0uF. 5.0uF.
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B+5 500pF

S1

12AX7

.001uF (500pF)

250kB Treble

500pF (.001uF)

270pF

S3 4M7

S2

1.716v

150k

.047uF ccw

.01uF

100kB Middle

1.0uF or 5uF

100k or 220k

10k

100kB OD Trim

4k7

V4

3

1.0uF

1.0uF or 5uF

200k

0.1uF

3k3 or 5k1

V5

4

Standby Switch Power Black Switch 345v-0-345v

3 120vac Power

B+1

100kA OD Level

Rk(OD2) Rk(OD2) 1k8 2k2

8

6L6

390R

Rk(OD1) 2k7 3k3

330k (or 150k)

350pF

2.03v

B+2 ~454vdc

B+1 475vdc

5

229v

180k

100kA Drive

White

110uF 350v 110uF 350v

2.0A SB Fuse (50W)

100R

To filaments & pilot lamp

22k/2W or 27k/2W

2k2/2W

20uF 500v

20uF 500v

10kB Bias Adj

1.2k/1W 100R

B+4 ~306vdc

B+3 ~436vdc

Choke

270k/1W

2kB Presence

8

.005uF (or .01uF)

OD2

Rk(OD1)

10k Trim

317v

V3B

4

5

350pF

Rp(OD2)

12AX7

100k

270k/1W

.1uF

3k3 or 5k1

227.5v 2.03v

Speaker

1K/5W

60.9v

820R

100k

1M

1M

0.1uF 200k

.022uF

303v 100k

V3A

.01uF or .02uF

OD1

1K/5W

Bias

B+3

Rp(OD2) 120k 150k 180k

B+4

Rp(OD1)

12AX7 68k

To Output Section

Rp(OD1) 180k 220k

5.0uF

B+2

12AX7

24k

B+4

2k2

Values in Red are alternate choices

Power Amp In

12AX7 1M

6L6

Preamp Out

1MA Master Volume

CL2

270k

Values in Sky Blue are suggested mods

100k (opt)

1.788v

S5

.001uF (opt) 10k

.005uF

220k

270k

500kA Bass

.1uF

Revised 03-15-00

47pF

.047uF 206.0v

Volume 1MA

cw

3k3

150k

.047uF

32M or 44M

390pF

100k

5.0uF

From Preamp

1977 Architecture with... 1997 values and switches

Local feedback loop

S4

cw

209.6v

1.0M

Hybrid Amp Rev A

B+5

S5: Deep Sw (opt)

220k

CL1 22k

S3: Boost Sw S4: Bright Sw

S1: Mid Boost S2: Rock/Jazz

100uF 100v

Bias 15k

B+5 ~303vdc

1k/2W or 2k2/2W

20uF 500v

20uF 500v