02-19-2014, 11:07 AM
Brenda - thanks, I'll try that this evening.
Morzh -
1. Thanks, I will do that this evening also.
2. Actually, no, I don't - I have plenty of capacitors for the old Philcos, but not for solid-state equipment as I have not worked on solid-state electronics for many years. I am going to order some new electrolytics for a couple other receivers soon, and will also order some new electrolytics for the 4400 as well.
3. Tested, replaced, retested. The driver Q6 was definitely bad and was replaced. I replaced the outputs, Q8 and Q10, as well based on my testing with the multimeter. But now that I have the transistor tester, I find that the original outputs test OK. (I retested the original driver with the transistor tester and it was bad without a doubt, so it went into the trash can.) I still have the replacement outputs in the 4400.
I tried using my multimeter to test the transistors. Worked OK for silicon but I was getting inconclusive results for the germaniums. This is why I made the investment in a Heathkit transistor tester. It was cheap, really - $19.99 with free shipping, and it only needed a new battery and the switches needed to be cleaned with DeoxIT. It works fine.
Morzh -
1. Thanks, I will do that this evening also.
2. Actually, no, I don't - I have plenty of capacitors for the old Philcos, but not for solid-state equipment as I have not worked on solid-state electronics for many years. I am going to order some new electrolytics for a couple other receivers soon, and will also order some new electrolytics for the 4400 as well.
3. Tested, replaced, retested. The driver Q6 was definitely bad and was replaced. I replaced the outputs, Q8 and Q10, as well based on my testing with the multimeter. But now that I have the transistor tester, I find that the original outputs test OK. (I retested the original driver with the transistor tester and it was bad without a doubt, so it went into the trash can.) I still have the replacement outputs in the 4400.
I tried using my multimeter to test the transistors. Worked OK for silicon but I was getting inconclusive results for the germaniums. This is why I made the investment in a Heathkit transistor tester. It was cheap, really - $19.99 with free shipping, and it only needed a new battery and the switches needed to be cleaned with DeoxIT. It works fine.
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Ron Ramirez
Ferdinand IN