Silvertone 4663

 


Home Search Aetna Airline Atwater Kent. Bendix Blaupunkt Bogen Bowers Breting 14 Bulova Crosley Delco Dentron Electro-Neutronics Emerson Emud Fairbanks Morse Grant, W. T. Grebe Grundig Grunow Hammarlund Hallicrafters Heathkit Henry Hickok 288X Howard Howard Johnson Jesse French Johnson Korting Lafayette Lap Amp Motorola NAD National. Nordmende Norelco Packard-Bell Perpetuum-Ebner PHILCO Philips PYE P35 RCA Robyn T-123B SABA Silvertone 4663 Standard A Stewart Warner Telefunken Triplet 3436 vhf gen Wagner Walgreen WEGA Westinghouse Yaesu ZENITH Links Audio Reinforcement Antenna Cabinet Finishing Capacitor stuffing Comments Dial Scales Dim Bulb Tester Electrodynamic Electrostatic Elmer is his name. Etching Emblems IF Transformers Lead Twister Leakage Tester Packing Tips Resistors Rodent Damage Shiny Chassis Slides & Presentations Tube Analyzing Vendors Laptop

 

 

 

1708

Silvertone 1708-A page.  

 

4663

This is a Tombstone radio sold by Sears.  A Silvertone Model 4663 three band radio.   It has standard broadcast from 540 to 1800 kHz, a 1700 to 6300 kHz police band and a 5950 to 18500 kHz SW band.  http://www.nostalgiaair.org/Resources/181/M0017181.htm 

 

im000109.jpg (272199 bytes)

im000110.jpg (262301 bytes)

im000111.jpg (279685 bytes)

im000112.jpg (265576 bytes)

im000113.jpg (192177 bytes)

im000101.jpg (272564 bytes)

im000102.jpg (251874 bytes)

im000104.jpg (152911 bytes)

Resistance is Futile

The electrical restoration was straight forward.  Many of the Dog Bone resistors are way out of tolerance.  They were replaced with modern 1/2w 5% carbon film resistors of slightly larger wattage.  The original resistors are rated at 1/3 watt (except for R7 2w).

The 6X5 rectifier tube tested good on the emissions tester but failed to supply full B+.  This tube was replaced with a custom made solid state replacement.  That included two 1n4007 diodes and a 150 ohm 5w wire wound resistor.  The 6X7 tube has a 22volt drop at 70ma according to Duncan Tubes TDSL tube list.  That works out to be 314 ohms at full load.  However, this radio apparently does not pull full load.  The resistor was chosen for documented B+.

It is argued that Resistors do not drift to the extend of needing "shotgun" replacement.  Below is a table of some of the resistors and what they measured.  All resistors were replaced.

Resistor

Measured

Value

multiplier - 1/3 watt unless noted

%

R2

78

50

k

56%

R5

19.5

20

k

-3%

R6

47

30

k  1/2w

57%

R7

24

20

k  2watt

20%

R8

1.64

1

meg

64%

R9

88

50

k

76%

R10

1080

500

k

116%

R11

380

400

ohm

-5%

R12

46

40

ohm

15%

R14

2.36

1

meg

136%

R16

516

250

k

106%

R17

4.7

2

meg

135%

R18

300

300

ohm

0%

R19

1200

500

k

140%

R20

2.56

1

meg

156%

Once you lift a lead wire to accurately measure the resistor often it is simpler to solder in a new resistor instead of trying to splice the lead wire of the original resistor.  A tiny bit of extra time can make the different between a stable daily driver or one that will revisit your work bench over and over as the each remaining original resistor drifts out of tolerance.  When you restore your unit, you decide if you want to leave the resistors alone or replace them with 5 cent carbon film 5% resistors.  

If you want the vintage dog bone look see here  Try Syl's web site.  .

 

I have my Eye on you!

Classic dilemma.  A new eye tube cost about 25 to 45 bucks.  What do you do?  Try a Russian made brand new 6E5C octal based eye tube.  Here is the conversion story.  Aquire the new tube, an octal socket, a salvaged six pin plug some wire and a wrapper.  Add an STSP switch in the B+ line and you have an adaptor with a phosphor life extending blanking switch.  You could just retrofit the six pin socket on the radio.  But I like the ability to use the original 6U5.

im000118.jpg (272687 bytes) im000115.jpg (256670 bytes) Verify proper operation of your wiring job on a tube tester. im000117.jpg (340313 bytes) Looking good.
Element Pin 6E5C 6U5
nc 1  
Filament 2 1
Anode (plate) 3 2
nc 4  
Grid 5 3
L 6 4
Filament 7 6
Cathode (K) 8 5
im000119.jpg (268151 bytes)

Eye tube base.

im000103.jpg (39357 bytes) The final solution has a blanking switch.

More eye tube conversions found at:

 

Finished Radio.

IM000020.JPG (230706 bytes) IM000022.JPG (319216 bytes) IM000021.JPG (244878 bytes) IM000024.JPG (117067 bytes) IM000023crop.JPG (64537 bytes)

 

Hit Counter

 Contact me including your thoughts and comments. 

Please see the LINKS page.  I have collected many resources over the years.

135,912 unique web site visitors (14,499,000 hits) from October 2004 through August 2011.

Copyright 2004 - 2012. All rights reserved.