Deassembly log

Deassembly log

Power supply and wiring on zones: (22,23,24)A&B

Electrolytics identified: C49 in deeper position C48 in outer position

CH1 removed; it was with leads not in sigth. Wires were running in between c48 and c49

Electrolytics unlocked and unsoldered
C49 wired to T8 (central lead) and SO1 pin3 (blue wire)
C48 wired to middle lead of BASETTA in 16B and V13 pin4

CH1 unsoldered leads to caps as per diagram

Dismounted T8; wiring:
primary: left lead to V14 pin3; left lead to V13 pin3
secondary: red to ground lead in 20A; blue to non groud lead in BASETTA in 20A (very colse each other)

R42 and C44 de soldered from GND - wiring is by sure not original...

Tubes

ID	required model	Function	found inside	is it pin2pin compatible?	Status Sep 99	Action done
V12	6SC7	1st Audio Amplifier	6SC7	Y	OK But Very low	Subst.
V13	6V6 GT	Push-pull Audio Amplifier	6V6 GT	Y	OK	Subst.
V14	6V6 GT	Push-pull Audio Amplifier	6V6 GT	Y	OK minimum	Subst.
V15	5Z3	rectifier	no writing	?	OK	None

CAPS

ID	required value	required voltage (Volts)	material	Required tolerance (%)	Found inside	Connections	note	status	Action required	Remove Sequence #	Rplaced With
C42	0.02mF	600V d.c.	Tubular	-10%+40%	0.02mF 600V	Leftmost lead of R35 pin3 lead of SW10 (one of the lateral)
C76	2000 pF	500V d.c.	mica	20	missing	V14pin3 B2lead3	see R43	OK			2200pF 2KV
C48	30mF 400V d.c.	400V d.c.	Electrolytic	-10%+40%	16+16uF525Vp	Wired to T8 primary (central tap) Wired to SO1 pin3 (blue wire) Wired to CH1pin?	no ground wire. Is it normal?	OK	clean terminals & reconnect	1
C49	30mF 400V d.c.	400V d.c.	Electrolytic	-10%+40%	16+16uF525Vp	Wired to B1pin2 Wired to V13 pin4 Wired to CH1pin?	no ground wire. Is it normal?	OK	clean terminals & reconnect	2
C44	10uF	300V d.c.	Electrolytic	-10%+40%	8uF 500V	V13pin6 GND@cable shield in z20A	not original current wiring seems not original	SEMISOLD	replace rewire GND to B2lead2	6
C45	50nF	400V d.c.	Tubular	-10%+40%	50nF 1500V	V14pin5 V12pin2	Not original	OK		8	0.047 400V orange
C43	5000pF	300V d.c.	Mica	10%	5000nF mica	V12pin2 B3pin1 (with R37)		SEMISOLD		10	Series of 2x0.01mF 630V
C46	0.05mF	400V d.c.	Tubular	-10%+40%	0.05 400V	V12pin5 V13pin5		OK		14	0.047 400V orange
C40	500pF	500V d.c.	Mica	20%	500 mica	V12pin1 V12pin5		OK		17	Series of 2x1n2 630V
C41	40mF	25V	Electrol.	-10%+40%	10mF30V	V12pin6 GND close to V12	GND was to GND pin of T4	OK		21	47mF25V
C20	0.02mF	600V	Tuvular	-10%+40%	20000pF 500V	B1pin3 GND ??				22
C 16	0.02mF	600V	Tuvular	-10%+40%	missing	B1pin1 GND ??				25
C47	40mF	25V	Electrol.	-10%+40%	missing	V13 pin8 B2lead2	see R42 needs better wiring may be originally was in B2lead2	OK		5bis	47mF 35V

Resistors

ID	required value (ohms)	required power (Watts)	material	Required tolerance (%)	actual value	Connections	note	status	action required	Remove Sequence #	Replaced with
R33	500K		Pot		Open	bad, very bad			Change		Old but working 500K pot
R35	500K varib. Pot. Cureve n.1		pot		11K	Pin1&2 wired to B2pin2 (GND) Pin3 to C42			none
R43	20K	2	carbon	10	missing	V13pin3 B2lead3	with C76	ok	restore		New 22K 2W
R42	220	2	carbon	10	369	V13 pin8 GND@cable shield in z20A	pair bundle of 450Ohms 2W needs better wiring may be originally was in B2lead2	OK	change	5	New 220 2W
R41	250K	1/2	Carbon	20	312k	V14pin5 B2lead1		OK	change	9	New 270K 1/2W
R37	100K	1/2	carbon	20	116k	V13pin6(unused by the tube!) B3lead1 (with C43)	1st audio plate load	SEMISOLD	change	11	New 100K 1/2W
R36	100K	1/2	Carbon	20	105K	V12pin5 V13pin6(unused by the tube!)		OK	Change	12	New 100K 1/2W
R38	50K	1/2	Carbon	20	66K	V13pin6(unused by the tube!) V13pin4		OK	Change	13	New 47Knominal 50Kactual
R40	250K	1/2	Carbon	20	304K	B2lead1 V13pin5		OK	Change	15	New 270K 1/2W
R39	200K	1/2	Carbon	20	240K	V12pin1 V12pin4		OK	change	16	New 200K 1/2W
R34	1K	1/2	carbon	20	1235	V12 pin6 pin8(gnd)		OK	change	20	New 1K 1W
R10	3K	1/2	Carbon	20	1216	B1pin3 B1pin2 (B+)	It was original but of 1K instead of 3K Not sure it really is R10	NOK	Check	23
R5	1K	1/2	Carbon	20	1345	B1pin1 B1pin2(B+)	Not sure it really is R5 as I've not found the corrispondent bypass capacitor (C16) connected to it.	check	check	24

Inductors/Transformers

ID	required value	required d.c. resistance (ohms)	actual d.c. resistance (ohms)	connections	notes	status	actions required	Remove Sequence #	Done action
CH1	13 Henries	300 +-10%	300	C49 (+) & C48 (+)	lost info on wich lead to which cap continuity test passed	OK	NONE	3	none
CH2	4 Heries +-10%	220 +-10%	243	Left lead to B3pin1 Right lead to v12pin2		OK	NONE	7	None
T7		117V Prim 580V ac. C.T. @185mA 6.3V a.c. 5,5A 5V a.c. 3A	N/A	As per schema	continuity test passed warm test passed; all voltages within ranges	OK	NONE		None
T8		10Kohms C.T. prim. 100-500-5000 secondary	Primary ohms reading is 300 instead of 10K Secondary ohms reading is too low for my multimeter (seems less that 1 ohm)	primary: left lead to V14pin3; left lead to V13pin3 secondary: red GND@cable shield in z20A; B4pin1 (very colse each other)	not original	NOK	CHANGE	4	Replaced With new choke (*)

(*) the new transformer has been calculated and wound by Ditta TOSCO, Via Matera,7 - Torino (ITALY) Tel +39 11 3294952

Misc

ID	specs	Found inside	connections	notes	status	actions required
FS1	1/2A 250V	Bad unknown fuse	T7 lead 5 SW3	Temporarily an out of spec fuse has been inserted	NOK	New fuse needed to match specs
SO1	Octal socket	Octal socket	N/a		OK