01-25-2010, 07:36 AM
Hi Gary
Great acquisition!
In regard to part (29), which is 1, 1, 1 and 2 uF in one can, the negative leads of all four of these do go to chassis ground. And, yes, these absolutely must be replaced if you are going to use the radio. As codefox has previously stated, you need to replace all paper and electrolytic capacitors in the set. Also check the resistors, and replace those found to be more than 20% higher or lower than stated values.
The main power supply filters, (101) and (102) were originally 8 uF - replace with 10 uF, 450 volts or even 500 volts if you can find them. The B+ at the input filter is greater than 400 volts DC. The negative leads of these need to connect to B-, the same place as the center tap of the high voltage secondary on your power transformer. Positive leads need to connect to either side of the filter choke (99).
A word about the other (101) in the circuit, the 10 uF cap connected between B- and ground. This one is 10 uF, 50 volts - and the POSITIVE lead needs to connect to ground. The negative connects to B-.
Great acquisition!
In regard to part (29), which is 1, 1, 1 and 2 uF in one can, the negative leads of all four of these do go to chassis ground. And, yes, these absolutely must be replaced if you are going to use the radio. As codefox has previously stated, you need to replace all paper and electrolytic capacitors in the set. Also check the resistors, and replace those found to be more than 20% higher or lower than stated values.
The main power supply filters, (101) and (102) were originally 8 uF - replace with 10 uF, 450 volts or even 500 volts if you can find them. The B+ at the input filter is greater than 400 volts DC. The negative leads of these need to connect to B-, the same place as the center tap of the high voltage secondary on your power transformer. Positive leads need to connect to either side of the filter choke (99).
A word about the other (101) in the circuit, the 10 uF cap connected between B- and ground. This one is 10 uF, 50 volts - and the POSITIVE lead needs to connect to ground. The negative connects to B-.
--
Ron Ramirez
Ferdinand IN
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