>Some folks have suggested that a cause of the loss of pin solder is from not
>oiling the cooling fan. I agree with that but if you determine that the
>fan is
>rotating properly, I have another cause to investigate. I used to have the
>same problem (SB-220 amp) and found the following problem: The tube
>socket's
>spring clips had become weak and were not holding tight onto the tube pins.
The cause of loss of spring tension is excessive heat which causes the
spring to lose its temper. In a SB-220, not oiling the fan bearings
every couple of years or blocking the exaust air at the top and/or left
of the cabinet are the usual culprits.
>Take out the tube and look at the bottom of the tube socket. Are the ends
>of
>the socket clips close together? Do you see discoloration in the spring
>clips. If the answer is yes, then replace the clips with new ones (from
>another new socket) and you'll be in business. I did this to my problem a
>year
>ago and no more desoldering problems. Gd luck, Phil KB9CRY
>> Thanks for the answers regarding the subject.We'll try to acquire
>> Ag/Sn solder if we can, if not possible will try with 60/40 solder.
>> Thanks for the information.
>>
>> Best regards
>> Guillermo.
>> _______________________________________________
>> Amps mailing list
>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>_______________________________________________
>Amps mailing list
>Amps@contesting.com
>http://lists.contesting.com/mailman/listinfo/amps
>
- R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K,
www.vcnet.com/measures.
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