Deassembly log

Detector and 1st ANL on zones: 14B 8A 8B

 

1.        0.05 uF paper cap from point A(outer foil) to GND-V11pin1 (thus it was a sprague original cap, there is not any cap between point A and GND in halli’s diagrams.

2.        wire from B4pin2 to V7pin?

3.        2wires to panel lamps from V11pin7 (6.3V line)

 

Tubes

ID

required model

Function

found inside

is it pin2pin

compatible?

Status

Sep 99

Action

done

V7

6B8

2nd Detector

S-meter driver

VT-93

(=6B8)

Y

inefficient
  • Bought a NOS (glass)
  • Substituted

V10

6H6

Noise rectifier

6H6

Y

OK

But Very low
  • Bought a NOS
  • Substituted

 

Caps & Resistors

ID

Required

 value

Other params

 

Watt for res.

 

Working voltage

for caps

 

Type

Required

tolerance

(%)

actual value

Connections

Function

status

action

required

Remove

Seq #

Replaced

with

R45

20K

2W

Carbon

10%

24.5K

·   B4pin1

·    

BFO plate load

NOK

Subst.

0

 

C109

70-90pF

 

Variable ceramic

N/A

 

·   inside T3

·   to secondary coil

 

 

 

 

 

C39

0.02uF

400V d.c.

Tubular paper

-10+40%

 

·   B4pin3

·   V7pin1(GND) outer foil

·AVC development net

NOK

Subst.

1

 

R27

500K

1/2

Carbon

20%

670K

·   B4pin4

·   B7pin2(A)

·AVC development net

NOK

Subst

2

 

R70

1M

½

?

20%

1.260M

·   B6pin1(C)

·   B7pin1 (B)

·ANL development net

NOK

Subst.

3

 

R25

500K

½

Carbon

20%

692K

·   V11pin8(GND)

·   B7pin2(A)

·Detector filter net

NOK

Subst.

4

 

R24

100K

½

Carbon

20%

136K

·   B7pin1(B)

·   B7pin2(A)

·Detector filter net

·ANL development

NOK

Subst.

5

 

C37

50pF

500V d.d.

Mica

20%

62pF

·   B7pin1(B)

·   V11pin8(GND)

·Detector filter net

NOK

Subst.

6

 

R23

3K

½

Carbon

20%

4.24K

·   B7pin3(B+)

·   B5pin2

·Plate load of V6

NOK

Subst.

7

 

C50

0.02uF

400V d.c.

Tubular paper

-10+40%

 

·   B5pin1

·   B7pin2(A)

·AF coupling cap

NOK

Subsy

0

 

C36

0.02uF

600V d.c.

Tubular paper

-10+40%

 

·   B5pin2

·   B4pin2(GND)

·bypass for V6 plate

NOK

Subst.

8

 

C53

0.05uF

200V d.c.

Tubular paper

-10+40%

 

·   B6pin1(C)

·   B8pin2(GND) outer foil

·ANL development net

NOK

Subst.

9

 

 

 

Inductors/Transformers

ID

required value

required d.c. resistance

(ohms)

actual d.c.

resistance

(ohms)

connections

notes

status

actions

required

Remove

Sequence

#

Done action

T3

 

 

 

 

 

 

 

 

 

 

Misc                                                                                                         

ID

specs

Found

inside

connections

notes

status

actions

required