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Dynacord Echoking

Category: Delay· Delay Echo and Samplers
Price: see vendor
Tags: Delay Echo and Samplers

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Schematic

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Parts list 83 rows

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Check before you build · 7 values the reader of this schematic was not sure of

R23: 1.0K or 1.8K
R43: designator unclear (R43 or R23), value 15.3K 6W
C3: 50pF or 30pF
C23: first digit obscured
C24: 0.04uF or 0.01uF
C20 vs C20a: both read on the sheet; the Rö1 cathode cap may be a different number
Switch bank: count and pole count approximate

Ref	Value	Normalized	Type	Notes
Resistors 34
R3	220K	220k		read from the schematic by eye
R4	2M	2M		read from the schematic by eye
R6	10M	10M		read from the schematic by eye
R7	1.5K	1.5k		read from the schematic by eye
R8	220K	220k		read from the schematic by eye
R9	220K	220k		read from the schematic by eye
R10	68K	68k		read from the schematic by eye
R11	510K	510k		read from the schematic by eye
R12	1M	1M		read from the schematic by eye
R13	330K	330k		read from the schematic by eye
R14	220K	220k		read from the schematic by eye
R15	1K	1k		read from the schematic by eye
R16	510K	510k		read from the schematic by eye
R17	15K	15k		read from the schematic by eye
R18	10K	10k		read from the schematic by eye
R19	10K	10k		read from the schematic by eye
R20	220K	220k		read from the schematic by eye
R21	1.5K	1.5k		read from the schematic by eye
R22	10K	10k		read from the schematic by eye
R23	1.0K	1k		drawn '1,0K' at the Rö3 oscillator grid; could be 1.8K; read from the schematic by eye
R24	150K	150k		read from the schematic by eye
R25	1.5K	1.5k		1W per the drawing's wattage symbols; read from the schematic by eye
R27	470Ω	470		read from the schematic by eye
R28	51K	51k		read from the schematic by eye
R29	51K	51k		read from the schematic by eye
R32	1M	1M		read from the schematic by eye
R33	51K	51k		read from the schematic by eye
R34	51K	51k		read from the schematic by eye
R35	100K	100k		read from the schematic by eye
R36	51K	51k		read from the schematic by eye
R37	100K	100k		read from the schematic by eye
R38	100K	100k		read from the schematic by eye
R39	51K	51k		read from the schematic by eye
R43	15.3K	15.3k		6 watt; drawn '15,3K'; designator read as R43; read from the schematic by eye
Capacitors 31
C1	4700pF	4.7n		read from the schematic by eye
C2	0.05uF	50n		read from the schematic by eye
C3	50pF	50p		first digit obscured by a fold; could be 30pF; read from the schematic by eye
C4	50uF	50u		electrolytic; read from the schematic by eye
C5	0.01uF	10n		read from the schematic by eye
C6	680pF	680p		read from the schematic by eye
C7	680pF	680p		read from the schematic by eye
C8	3300pF	3.3n		read from the schematic by eye
C9	4700pF	4.7n		read from the schematic by eye
C10	1000pF	1n		read from the schematic by eye
C11	100pF	100p		read from the schematic by eye
C12	1000pF	1n		read from the schematic by eye
C13	50uF	50u		electrolytic; read from the schematic by eye
C14	4700pF	4.7n		read from the schematic by eye
C15a	32uF	32u		350V; dual can 32+32uF with C15b; read from the schematic by eye
C15b	32uF	32u		350V; dual can with C15a; read from the schematic by eye
C16	0.1uF	100n		read from the schematic by eye
C17	0.1uF	100n		read from the schematic by eye
C19	68pF	68p		read from the schematic by eye
C20	50uF	50u		electrolytic, Rö1 cathode bypass; read from the schematic by eye
C20a	32uF	32u		450V electrolytic; dual can with C20b; read from the schematic by eye
C20b	32uF	32u		450V electrolytic; read from the schematic by eye
C21	5000pF	5n		500V; read from the schematic by eye
C22	1.5uF	1.5u		MP, 220V; motor capacitor; read from the schematic by eye
C23	?	?		drawn '?000pF' 500V, first digit obscured; read from the schematic by eye
C24	0.04uF	40n		could be 0.01uF; read from the schematic by eye
C25	80pF	80p		read from the schematic by eye
C26	80pF	80p		read from the schematic by eye
C27	80pF	80p		read from the schematic by eye
C28	80pF	80p		read from the schematic by eye
C29	80pF	80p		read from the schematic by eye
Inductors 1
Dr1	652	652H		choke, type 652; read from the schematic by eye
Potentiometers 6
Hallstärke	250K	250k	Potentiometer	R2; echo level; read from the schematic by eye
Halldauer	250K	250k	Potentiometer	R5; echo duration, drawn on one axis with Pot1; read from the schematic by eye
Pot1	B1M	B1M	Potentiometer	B taper (lin); read from the schematic by eye
Pot2	B1M	B1M	Potentiometer	B taper (lin); read from the schematic by eye
Pot3	B500K	B500k	Potentiometer	treble (clef symbol), B taper; read from the schematic by eye
Pot4	B1M	B1M	Potentiometer	bass (clef symbol), B taper; read from the schematic by eye
Trimmers 5
R1	50K	50k		input preset; read from the schematic by eye
R26	500Ω	500		hum/balance preset on the heater supply; read from the schematic by eye
R40	500K	500k		head level preset; read from the schematic by eye
R41	500K	500k		head level preset; read from the schematic by eye
R42	500K	500k		head level preset; read from the schematic by eye
Switches 1
×5	DPDT	DPDT		push-button bank selecting the playback heads; pole count approximate; read from the schematic by eye
Other 5
Rö1	ECC83	ECC83		tube (12AX7); read from the schematic by eye
Rö2	ECC81	ECC81		tube (12AT7); read from the schematic by eye
Rö3	ECC82	ECC82		tube (12AU7), erase/bias oscillator; read from the schematic by eye
×1	?	?		relay, no part number; read from the schematic by eye
×1	?	?		tape motor; read from the schematic by eye