Atwater Kent 217 Schematic

Atwater Kent 217

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Product Information:
Model:217
Manufacturer:Atwater Kent

Schematics Content

Page 1:

Atwater Kent Mfg. Co.

Model 217, 427, 667
Schematic
Voltage

Diagram of models 217, 427 and 667

Above voltage measurements were made with 250 volt scale of a 1000-ohm-per-volts meter and a line supply of 110 volts. All measurements are made from cathode of each tube.

Page 2:

Atwater Kent Mfg. Co.

Model 217, 427, 667
Socket, Trimmer, Parts

217 Speaker No. 36300

Part No. Name of Part
21161 Diaphragm
18870 Field coil
21672 Output transformer
24206 Cone housing
23657 Choke coil
24064 Speaker mounting bracket
19469 Diaphragm holding segment (2 used)
24161 Diaphragm holding segment (1 used)

427-667 Speaker No. 33400
Parts not listed below will be found in Model 217 list

Part No. Name of Part
19465 Diaphragm
19789 Cable and plug assembly
24705 Cone housing
19469 Diaphragm holding segment (3 used)

Model 667
Parts not listed below will be found in Model 217 list

Part No. Name of Part
25864 Escutcheon name plate
24677 Bottom cover
25737 Knob - dial and volume control
25738 Knob - frequency range and tone
24725 Shipping Container

In models 427 and 667, the speaker is mounted in the cabinet under the chassis. Trimmer condenser A3 is not used in some of these sets.
It is important to keep the grid lead to the 55 tube removed from the 2A5 tube.

Model 217

Part No. Name of Part
24079 Volume control, .5 U

Transformers

Code No. Part No. Name of Part
T1 34140 No. 1 R.F.T.
T2 34150 No. 2 R.F.T.
T3 34160 Oscillator T.
T4 25841 No. 1 I.F.T.
T5 25842 No. 2 I.F.T.
T6 21672 Output T.
T7 25728 Power T.

Resistors

Code No. Part No. Name of Part
R1 19820 Flexible, 48 ohm
R2 23780 Flexible, 550 ohm
R3 16320 Flexible, 1050 ohm
R4 28950 Flexible, 160 ohm
R5 20980 Red-blue, .1 U, 1/2 W
R6 20930 Bl'k-purple, .5 U, 1/2 W
R7 20940 Green, 2 U, 1/2 W
R8 20980 Red-blue, .1 U, 1/2 W
R8A 20960 Gray-yel., 15,000 ohm, 1/2 W
R9 20940 Green, 2 U, 1/2 W
R10 20980 Red-blue, .1 U, 1/2 W
R11 26160 White, 40,000 ohm, 1/2 W
R12 20920* Red-yel., 1/4 U, 1/2 W
R13 32010 Blue, red, green, 500 ohm, 1 W
R14 27220 Gray-yel., 15,000 ohm, 1 1/2 W
R14A 34340 Yellow, red, black, 50,000 ohm, 1 1/2 W
R15 21040 Black, 65,000 ohm, 1/2 W
R16 17077 Flexible, 10 ohm
R17 31860 1.0 ohm, yellow, flexible
R18 30320 Maroon, 10,000 ohm, 1/3 W (used only in late sets)

* R12 is 1.0 U blue and gray number 30360 in late model sets.
Capacitors

Code No. Part No. Name of Part
C1 34470 14 MMF, 500 V
C2 34020 .05 MF and 250 MMF, 200 V
C3 31160 .05 MF, 100 V, NI
C4 34460 10 MMF, 500 V, black
C4A 34460 10 MMF, 500 V, black
C4B 34470 14 MMF, 500 V
C5 33630 Double 250 MMF, 450 V, IND
C6 33620 250 MMF, 450 V, IND
C7 27630 .01 MF, 200 V, IND
C8 34670 1450 MMF, 100 V
C9 33920 790 MMF, 100 V
C10 31530 .1 MF, 100 V, NI
C11 33930 25 MMF, 500 V
C12 32740 .003, 500 V
C13 25168 8 MF, 475 V, electrolytic
C14 25168 8 MF, 475 V, electrolytic
C15 25379 10 MF, 25 V, dry electrolytic
C16 31530 .1 MF, 100 V, NI
31340 Multiple bypass, 200 V, (J11)

Trimmers

Code No. Part No. Name of Part
A4,5 30110 Double I.F. trimmer
A6,7 30630 Double I.F. trimmer

Chokes

Code No. Part No. Name of Part
CK1 17015 R.F. plate choke
CK2 19210 1st detector plate choke
CK3 23657 Choke coil

Sockets

Part No. Name of Part
24493 5 prong
24494 6 prong
22733 6 prong (4 used)
22689 4 prong

Page 3:

Atwater Kent Mfg. Co.

Model 87-D
Change
Models 217, 427, 667, 706, 808, 808A
Changes

Model 87-D
Instructions for installing No. 26360 resistor in place of No. 23840
and
Instructions for installing No. 29804 No. 25990 resistor in place of No. 19850

Improving Tone Quality in Models 217, 427, 667, 708, 808, and 808A
Unsolder the connection to this condenser in the multiple bypass. (In late model 708, 808, and 808A this condenser is a separate tubular condenser and should be removed.)
To improve the tone quality of models 217, 427, 667, 808, 808A, and 708, remove the connection to the original quality condenser on the plate of the 2A5 output tube and add a #20940 10,000 ohm resistor and a #30250 tubular condenser (.025MF) as shown above.