So I bought a Mark IV long head yesterday. Total impulse buy, guy's like "I lost the speaker cabinet, can't play it for you, but it sounds excellent," and the price was, well, too good to be true.
I got it home and retubed it with known good brand new tubes (Mesa brand; I had a few lying around). The switching and preamp are all in good shape; the direct line out (DI) sounds exactly like what a Mark IV should sound like on all 3 channels.
However, turn up output level on any of the channels and what happens is.. nothing. I slid the chassis out of the wood and I'm pretty sure I've isolated the fault to the small transformer, the one that sits right behind the last two power tubes. That's the output transformer, right?
I'd like to try replacing it myself. If anyone knows where to get the part or has any tips on doing this, I'd be interested to hear your perspective.
What I don't need to hear: I am smart enough not to fry myself on the filter caps, I think; I have a decent working knowledge of electrical safety and I'm good with a soldering iron. I do have a good option in my local Boogie repair facility (I live pretty close to Petaluma). So I realize that's an option; I'm not soliciting opinions such as "Take it to your local Boogie repair shop" unless you think you have something to add that I haven't thought of.
I got it home and retubed it with known good brand new tubes (Mesa brand; I had a few lying around). The switching and preamp are all in good shape; the direct line out (DI) sounds exactly like what a Mark IV should sound like on all 3 channels.
However, turn up output level on any of the channels and what happens is.. nothing. I slid the chassis out of the wood and I'm pretty sure I've isolated the fault to the small transformer, the one that sits right behind the last two power tubes. That's the output transformer, right?
I'd like to try replacing it myself. If anyone knows where to get the part or has any tips on doing this, I'd be interested to hear your perspective.
What I don't need to hear: I am smart enough not to fry myself on the filter caps, I think; I have a decent working knowledge of electrical safety and I'm good with a soldering iron. I do have a good option in my local Boogie repair facility (I live pretty close to Petaluma). So I realize that's an option; I'm not soliciting opinions such as "Take it to your local Boogie repair shop" unless you think you have something to add that I haven't thought of.