Which Brand Electrolytic Caps for Fender AB763? - Page 3 - diyAudio
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Old 11th December 2012, 03:02 PM   #21
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Quote:
Originally Posted by techbiker View Post
Buy and oscilloscope and learn how to use it if you plan to do much more diagnostic work. These are extremely useful.
Extremely useful generally - but not really needed for valve amp repairs, I don't think I've ever had any occasion to do so? (and I use a scope a LOT!!).
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Old 11th December 2012, 03:11 PM   #22
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Originally Posted by Nigel Goodwin View Post
Extremely useful generally - but not really needed for valve amp repairs, I don't think I've ever had any occasion to do so? (and I use a scope a LOT!!).
I'm just speaking from experience. When I built Ian Thompson Bell's improved headphone amplifier, my scope allowed me to see that the hum I was hearing through my speakers was 60hz hum generated by poor AC heater line placement. I was able to pin-point where the interference was leaking in and correct the problem. YMMV though!
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Old 11th December 2012, 05:44 PM   #23
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I like the scope for a lot of tube amp trouble-shooting, super helpful, but I do believe this one be worked out with a DVOM. basic power supply trouble
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Old 17th December 2012, 06:46 PM   #24
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Turns out it was a bad cord end that caused the short. The leads screw onto the terminal posts and was the plastic was just old, cracked and it shorted out.
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Old 18th December 2012, 12:54 AM   #25
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So how did that blow the chassis fuse?
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Old 20th December 2012, 02:29 AM   #26
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The chasis fuse was never blown. The fuse holder was defective. I replaced the fuse holder today with another I got from ebay for $6 (old fender blackface fuse holder). Plugged it in (repaired the cord end the other day). Now things are working properly -- fuse doesn't blow.

Thanks again for the capacitor tips -- the F&T's seem pretty nice; I like the black color (versus blue).
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