Power Cord Replacement

I spoke about doing this in my post on fixing up a Peavey VTM 120, but I didn’t take pictures. Well, after the ground pin fell out on my Ampeg V4-B, it was time to replace another power cord. This time, I took some pictures for anyone interested in taking on such a task.

This actually happened to me while on my last tour with Exhumed. It didn’t stop me from playing. A ground pin isn’t essential to a functioning amp. It’s a safety device, in case there’s a short within the amplifier, so the amp doesn’t conduct voltage into the user through the chassis. I took my chances on the road, but once I was home it was time to replace this safety feature.

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Operating Theatre: Ampeg V-4B Part 2

My amp is older than me. I’m middle-aged and I’m falling apart. Why should my amp be any different? I’ve done some other work on it before [Part 1], but ye olde Ampeg V-4B was well overdue for a recap job.

It still looks better on the inside than me.

“Recap” means replacing capacitors. More specifically, electrolytic capacitors. After decades, they age and will drift from their original rating or even die. In the tone section of an amplifier, this isn’t always a big deal. It might change the tone. In the power supply, though, capacitor drift is a bigger deal: like, expensive-impossible-to-replace-power-transformer-blows-up big deal. The should be replaced before that happens.

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Operating Theatre: Ampeg V-4B

This last tour we did was killer… I mean it killed a lot of stuff. Not only were the stages littered with the bodies of the slain, but the gear suffered horribly, too. We did six weeks with GWAR just before and had nary a hiccup. The following excursion was three weeks of headlining buffoonery that really did us in. iPods were lost, speakers blown, casters shot, cords frayed, pedals shorted, and antennas snapped. The two most tragic losses were amplifiers. Without an amp, a metal band you are not. Tenacious D be damned (funny, I find them not). Sean’s Peavey XXX took a hit and still remains defunct. My Ampeg V-4B, with a bit of tuning up on my own workbench, will live again!

ampeg v4-B apart

When I last plugged in this disheveled beast, it was at Philadelphia’s Kung-Fu Necktie. Occultist had just finished a rousing set. I turned on my amp and it winked at me. The power light went on and then off. This was not good. A quick check of the external fuse revealed it had not blown. I couldn’t fathom what was wrong, but when I borrowed an amp, I found that I had a blown speaker in my 2×15. How and when I did not know. My amp, however, was expecting a 4Ω load and instead got 8Ω. Pop.

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