[Hallicrafters] Hallicrafters S-107 Mark 2.

[Richard Knoppow]

----- Original Message ----- 
From: "Tom Lewis" <n4tl2 at yahoo.com>
To: "hallicrafters" <hallicrafters at mailman.qth.net>
Sent: Thursday, December 29, 2011 7:47 AM
Subject: [Hallicrafters] Hallicrafters S-107 Mark 2.


All the work on this radio is done and it's tuned up and 
back in the chassis.


I changed all the Tiny Chief capacitors with modern 630V 
Metalized Polypropylene Film capacitors. I also put new 
electrolytic capacitors under the chassis. I also changed 
the speaker. The original Speaker appears to have gotten 
wet. It sounded poor. I found a replacement speaker at Parts 
Express, (www.parts-express.com). The speaker is a BOSS 
BRS46 4" X 6" Dual cone replacement speaker, $6.39. Now the 
radio plays fine would a much better sound due to the new 
speaker. I did have to open up two of the speakers mounting 
holes a little with a round file. I used 3/16 inch spacers 
between the speaker and the radio.

I checked capacitance value of the old capacitors on a HP 
4261A Capacitor meter. They all measure on the high side of 
the correct values. I also checked the leakage at 250 volts. 
The electrolytic and one Tiny Chief have 5 ma of leakage. 
The other Tiny Chief capacitors have 0.1 to 1 ma of leakage.


Thanks for all the comments about this radio.


73 Tom

     Is the leakage in _milliamps_ or _microamps_. Good 
paper caps should have less than about 5 microamps of 
leakage, good electrolytics less than about 15 microamps. 
Small amounts of leakage may make no difference in some 
circuits but be very critical for others. Check one of the 
new caps and see what sort of reading you get. My setup is 
somewhat makeshift but on new plastic film caps I don't get 
enough leakage to even indicate.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com