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Fender Passport Event
I have the Event version of the Passport but its similar to all the Passports. The output on both speakers are very weak. It appears everything on the mixer...
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Amazingly the amp did still play fine with the sawtooth wave feeding the B+ rail, but only for a few seconds before it would blow the fuse. I replaced the...
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Yup. Stubborn, stubborn, stubborn. But you bring up a good point and the thought of finally fixing the problem only to have another solder joint go bad...
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Resoldering the whole board was a daunting task so I hit most all components that were tied to a ground. I mentioned a stern fist, but a tap of a pencil...
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Polarity is correct. I should mention that this issue with it howling can still be stopped (and started) with a stern fist to the chassis. This 'fix' usually...
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The amp has a 'line output'. Run a cable from there to another amp and see if you get any sound. The line out bypasses the tube circuitry so this will...
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Did a little research on the vibrating transformer and it appears the sawtooth wave might have been an indication of things to come. Somebody discovered...
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I replaced the caps and now appears we're on to something different now. The howl can now be controlled with the master volume (VR7B) on channel 2 which...
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Thanks Jazz. That was the last place I checked before giving up. Not sure how I missed that....
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I'm back to working on this amp. Along with the caps I replaced, I also was going to replace C31? It is a 47uf 500V radial cap. I couldn't find a source...
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Unbelievable. I put several hours of playtime on the amp as well as 10's of hours that I left the amp on. Decided its time to put the chassis back into...
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And Jazz, thanks for the time you put in as well. Don't go too far, I still think there are issues with the mute and efx loop bypass switching. I havn't...
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With Enzo's spider sense usually being on the mark I investigated those caps a little more. They did appear suspect so I replaced them. I've run the amp...
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I'm having trouble understanding what's going on with the OT. The center tap is the source of voltage to power the preamp rail? How is it getting the voltage...
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FX Loop page 2, all the way to the right top - PREAMP_HT. Schematic sez to expect 200V, I'm getting about 175
I'll check the whoe power supply...
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Seeing about 175VDC with no ripple. However as the picture shows, get some interesting stuff when it starts to howl.
This is at R73/R91
...
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I attached a picture of what the howl looks like on the scope. I also attached a picture of what it looks like with the standby on. It's the same. This...
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The connector CON4 (page 2) that I was referring to going nowhere has no mate (on the schematics). (The connector CON5 that appears on page 6 (that you refer...
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I kept the mute circuit disabled and traced to where the channel 2 signal disappears. I have signal from both channels up to R79 on FX Loop page (2). From...Last edited by ricach; 12-11-2012, 02:30 AM.
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See Post #33. It was V2. Too sumarize from the beginning, I resoldered most of the power amp section. That then created the situation where switching channels...
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