Clueless Idiots and High Voltage Vacuum Tubes Really Do Mix!

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Entries from December 31st, 2007

Death Cap? That sounds delicious!

December 31st, 2007 · 10 Comments · Amp Repair

Many of you are likely wondering what is that tantalizing thing called a “death cap”. Let’s have a look shall we? If you’ll recall from my previous post, the rectifying circuit in the GA-5 looks like this : The death cap, a .022 mF is there to help suppress hum. Have that removed!! It is […]

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Debugging the GA-5T (How not to rectify)

December 10th, 2007 · 4 Comments · Amp Repair

As noted previously, the amp had a loud hum with no inputs connected and the volume and tremolo turned all the way down. Nothing I could do for it, I was going to have to open the case. So I took off the back to have a first look. And sure enough.. there was something […]

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Debugging the GA-5T (Prelude)

December 10th, 2007 · 5 Comments · Amp Repair

I’m finally going to write about the fun I’m not having debugging a 60’s Gibson Skylark. To be specific, this is a GA-5T Crestline. The Crestlines differ from the 50’s Skylarks in that they are almost a completely different circuit, using two output tubes in a push pull configuration. Here is the schematic. The first […]

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