Hammond AO-39 conversion to modified Vox AC-15 LiteDrawn By Steve Luckey 09/25/2012

D

4Ω SPEAKER

A

.01uF

150/5W

470K

.01uF

470K

100K8.2K

2

2

3

7

9

3

2

7

9

B

1

3 50uF

8.2K

V212AX7

V3EL84

V4EL84

C

140/5W

C

7

8

6

82047K470K

470K

.01uF

.022uF

100K

303

288

10

305

202

203

40

41

59

0

0

Hammond AO-23281-0

2 X 32µF 2 X 32µF

6.3 VACfilaments

2.2K / 5W 8.2K / 2W

A309 VDC

B288 VDC

C270 VDC

315 VAC

315 VAC 48

6

Voltages measured with Fluke 87V DMM. All controls max CCW. Line = 120VAC.

V5V4V2V1

4 5 5

449

5

V55Y3

2

5 VAC

V3

4

9

5

LINE VOLTAGE = 120VAC

2 AMPSLO BLO

D268 VDC

250 / 10W 1K / 2W

Hammond AO-23279-1

1M

2.2K

220K

25µF

3

47K

V1EF86

8

9

.1µF

6

1

Pins 2 and 7 are grounded

1M

360pF

5.1M

5.1M

5.1M

5.1M

5.1M

500pF

.0015µF

.0022µF

.0047µF

.01µF

VOL 500KA

180pF

Cut250KA

.005uF

5

4

1 2 3 4 5 6 7 8 9V1 86 0 2.1 htr htr 73 0 2.1 0V2 202 40 59 htr htr 203 41 59 htrV3 nu 0 10 htr htr nu 303 nu 288V4 nu 0 10 htr htr nu 305 nu 288

TUBE VOLTAGE CHART

73

86

2.1

5.1M resistors not needed if using a make-before-break switch

2 X 32µF 2 X 32µF

4Ω SPEAKER

6.3 VACfilaments

2.2K / 5W 8.2K / 2W

A309 VDC

B288 VDC

C270 VDC

315 VAC

315 VAC 48

6

Voltages measured with Fluke 87V DMM. All controls max CCW. Line = 121VAC.

Hammond AO-39 conversion to MARSHALL 18 WATT LiteDrawn By Steve Luckey 02/27/2011

V5V4V2V1

4 4 5 5

4499

5 5

V65Y3

2

5 VAC

V3

4

9

5

LINE VOLTAGE = 121VAC

2 AMPSLO BLO

3

2

1

820 50uF

100K

V112AX7

D

1M

33K

6

7

8

A

.01uF

150/5W

470K

.01uF

470K

100K8.2K

2

2

3

7

9

3

2

7

9

B

1

350-500uF

8.2K

V312AX7

V4EL84

V5EL84

C

140/5W

C

7

8

6

.005uF

470pF

Volume500K-A

Tone500K-A

.005uF 82047K

470K

470K

.01uF

.022uF

100K

D268 VDC

250 / 10W 1K / 2W

303

288

10

305

202

203

40

41

59

137

1.0

00

0

Hammond AO-23281-0

Hammond AO-23279-1