Burns Orbit A.jpg

Burns Orbit Amplifiers

A few of these turning up these days but not a lot of service information. They're some of the earliest mainstream transistor guitar amps and Orbit Twos and Threes can still be had for a few hundred pounds.

If anyone's got an orbit of any sort with original parts (doesn't have to be working) I'd be interested in buying or borrowing it to document.

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Burns Orbit Two

Available initially as a 2 x 10" and later as a 1 x 12"

16"h x 121/2"w x 91/2"d

Advertised output 40watts (British)

880. Orbit Two

Burns Orbit Two Front Panel.jpg

Burns Orbit Three

881 and 882: 'Orbit Three'  3 x 10"

885 and 886: 'Orbit Three Double 12'  2 x 12".

21"h x 25"w x 10"d     Weight approx 37Ib

Advertised output power 60watts (British)

Visio-Double 12 Logo.jpg

Worth noting that the 'Orbit Three Double 12' is not the same as an 'Orbit Double 12' (see below).

881 / 885. Orbit Three Standard

Burns Orbit Three Front Panel Standard.j

882 / 886. Orbit Three Reverb "with extra dimensional control" if you're into that sort of thing.

Burns Orbit Three Front Panel Reverb.jpg

Burns Orbit Three Schematic

Burns Orbit 3 Schematic.jpg

The next drawing is a bit of a mystery at the moment. Thank you to Jon Free at Black Guitars in Australia for posting photos of some back panels with factory schematic stickers. They're described as a 6303 Amplifier but we don't know which model they came from.

Some of the values are unclear, but the circuit for Channel One in particular is a lot different to the BE 009 03 version. Jon's site's got some very interesting Burns archives. Well worth a look.

BLACK GUITARS

347 BELGRAVE-GEMBROOK ROAD, EMERALD, VICTORIA 3782, AUSTRALIA

www.blackguitars.com

Burns Orbit 6303 Schematic.jpg

Burns Orbit Double 12

Note the rotary Bass control instead of a tone selector switch.

Orbit Double 12 Reverb

Burns Orbit Double 12 Front Panel Reverb

Burns Orbit Six

Available as a 6 x 10" or 3 x 12"

23"h x 331/4"w x 12"d   Weight (insert large number)

Advertised output power 100watts (British)

Popeye.jpg

883. Orbit Six Standard

Burns Orbit Six Front Panel Standard.jpg

884. Orbit Six Reverb

Burns Orbit Six Front Panel Reverb.jpg

Baldwin - Burns Orbit 75

Advertised output power 75watts

2x12" speakers now on the same face as the control panel.

Baldwin Burns Orbit 75 Front Panel.jpg

Semiconductor Details

1B40K20

If:   4A

Vbr:   200V

Silicon Bridge rectifier

1B40K20.jpg

NKT213

Vcb max:   32V

Vce max:   18V

Veb max:   10V

Ic:   250mA

Ptot:   200mW

Hfe:   50

PNP Germanium

TO1 Case.jpg

NKT217

Vcb max:   60V

Vce max:   40V

Veb max:   10V

Ic:   500mA

Ptot:   200mW

Hfe:   50

PNP Germanium

TO1 Case.jpg

NKT304

Vcb max:   30V

Vce max:   20V

Veb max:   15V

Ic:   2500mA

Ptot:   750mW

Hfe:   50

PNP Germanium

TO8 Case.jpg

PNP Germanium

NKT403

Vcb max:   80V

Vce max:   32V

Veb max:   40V

Ic:   10A

Ptot:   50W

Hfe:   50/150

PNP Germanium

TO3 Case.jpg

NKT404

Vcb max:   60V

Vce max:   32V

Veb max:   20V

Ic:   10A

Ptot:   50W

Hfe:   50/150

PNP Germanium

TO3 Case.jpg

NKT452

Vcb max:   36V

Vce max:   32V

Veb max:   10V

PNP Germanium

TO3 Case.jpg

Ic:   3A

Ptot:   43W

Hfe:   30/90

PNP Germanium

OC25

Vcb max:   40V

Vce max:   40V

Veb max:   10V

Ic:   4A

Ptot:   23W

Hfe:   15

TO3 Case.jpg

OC35

PNP Germanium

Vcb max:   60V

Vce max:   32V

Veb max:   20V

Ic:   8A

Ptot:   30W

Hfe:   25

TO3 Case.jpg

OC706

PNP Silicon (The only silicon transistors in the circuits, used as channel input devices)

No other data available

OC706 Case.jpg

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