Figure 1: The “caulk tube fix” can be seen behind the transformer.
My Trusty Ten Tec 260 power supply is a nice hefty one: – it’s capable of delivering 28 amps, and that’s enough to power any of my radios with ease. Unfortunately, the supply developed the “old power supply” malady of producing slightly less-well-filtered DC current. The first thought for me was that it was the electrolytic capacitors. I checked the caps with my brand new ESR meter and a capacitor checker. Oddly, the caps all seemed to check out OK.
Still, it seemed to me that the main filter capacitor was the culprit, because …
WB8LZR 
Hi Ron –
I was happy to run across your article on the 260 power supply. I have one that has no voltage at the output terminals – I’m hoping it is just the pass transistor(s) as the transformer appears to be good. Do you have a schematic for the 260 that I could get a copy of? Thanks, John W0DC
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Hi John, sorry I took so long to respond. I used the model 280 schematic, which is on the tentec.com site.
Click to access Model_280_Power_Supply_Owner_Manuale592.pdf
It is similar to the 260, and you can figure out the differences pretty easily. 73s – Ron
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Thanks Ron –
The 280 manual does look close – I appreciate the help!
73, John W0DC
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