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  1. Replies
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    This product looks pretty identical to me, but...

    This product looks pretty identical to me, but have not gone through every parameter. It is in stock at Digikey for sure.

    https://www.onsemi.com/pub/Collateral/FSFM300-D.PDF
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    It ended up being the A1 op amp. Replaced it with...

    It ended up being the A1 op amp. Replaced it with a similar modern one and it works great. Pretty good sounding amp. Reminds me of a Yamaha G50 that I have (which is a really underrated SS amp). Once...
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    Thanks Juan, that is really helpful. Good tip to...

    Thanks Juan, that is really helpful. Good tip to check for shorted C4, I hadn't thought of that.
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    Help with FET voltages on Lab Series L3

    Working on this amp, power amp works, tracing signal shows it doesn't get past the first FET Q1. There is no DC on the Source or Drain, so I am guessing the 356 op amp is dead (I have found other...
  5. Thread: Plush amplifer

    by glebert
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    135

    I think some models have an extra preamp tube...

    I think some models have an extra preamp tube (relative to a twin) that is used for the line out, but I could be wrong.
  6. So you are saying you like your music really loud...

    So you are saying you like your music really loud and you like hauling very heavy amps? :)
  7. Wonder if you could repurpose the op amp that...

    Wonder if you could repurpose the op amp that drives the Line Out to boost the signal to the power amp? Maybe make the Line Out jack into a second Power Amp In for smaller signals.
  8. All the other pots were labeled in a conventional...

    All the other pots were labeled in a conventional fashion. Just this one oddball. I wonder if Ibanez even used it in many other places, since most Ibanez products I can think of (guitars and effects)...
  9. Took apart the old pot, which was cracked off...

    Took apart the old pot, which was cracked off above the pins, probed to the ends of the resistive trace and it read about 100 ohms. No idea how a 100k could be working with a reasonable sensitivity,...
  10. Perhaps I buried the update. No idea why this...

    Perhaps I buried the update.

    No idea why this part had such an unconventional marking. I was thinking it was some nonstandard pinout or something.
  11. Did get a hold of Ibanez support but they...

    Did get a hold of Ibanez support but they couldn't tell me anything about the part and were going to do some digging. In the meantime I looked at the circuit and didn't see anything special about it...
  12. Replacement for Ibanez volume pot marked 1B100?

    Working on an Ibanez Soundwave 65 (aka SW65) bass amp for my kid. No schematics available that I can find. Traced problem to the volume pot which measures complete open to all terminals. Pot is...
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    Found something interesting that seems like it...

    Found something interesting that seems like it would be a factor in this. Last night I had been playing my old AX2 through headphones, had tweaked my settings and models to get something I liked...
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    OK, issue has been resolved, but in the least...

    OK, issue has been resolved, but in the least satisfying way possible, because I'm not even sure what solved it. I know that I screwed up at least one thing, maybe two. Was hunting on stuff today and...
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    Got it, will do!

    Got it, will do!
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    415

    I haven't even pulled the power tube board, this...

    I haven't even pulled the power tube board, this amp is like a house of cards with all the separate boards. The one benefit is not having to pull all the knobs and pot nuts to access the tube or...
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    Haven't used a dummy load yet. Hum pot didn't...

    Haven't used a dummy load yet. Hum pot didn't seem dirty (no pops or scratches when turning). I will check V5 at pins 8 and 3. Will also look at the heater filaments. I hadn't replaced C49 and C50...
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    415

    Did this first thing. No effect. At the...

    Did this first thing. No effect.



    At the speaker? It varies with the hum balance, there is a 60Hz fundamental, which I can then dial out with the balance. As this is being reduced higher...
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    415

    Peavey Triumph PI hum/noise

    This amp is really pissing me off. Has a nasty hum and noise on all channels, preamp controls have no effect on it. The noise is kind of a whooshing sound (sometimes some pops) that does reduce after...
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    This reminds me of when we used to get dendritic...

    This reminds me of when we used to get dendritic growth on RF circuits when flux was not properly cleaned of the substrates. Here is an interesting article, basically it is unintended electroplating....
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    Does fiddling with any knobs or switching...

    Does fiddling with any knobs or switching channels change the noise (better or worse)?
  22. Thanks for all the ideas and input. I am leaning...

    Thanks for all the ideas and input. I am leaning towards a bit of a hybrid approach, using Juan's suggestion for sawdust and glue to fill in the void, and on the inside of the baffle making a not too...
  23. Fixing tearout in particle board speaker baffle

    I have a modernish Acoustic B450 210 combo that had a bit of a rattle. Found that one of the 8 screws on one of the 10" speakers had torn the T-nut out of the particle board baffle. It was a lateral...
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    Have any of the pots been changed out? I worked...

    Have any of the pots been changed out? I worked on one of these a while back and just used regular PCB pots, then found out the triangular metal brackets on the pots were necessary for grounding, but...
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    It was a joke guys.

    It was a joke guys.
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    I trust none of you curmudgeons have a digital...

    I trust none of you curmudgeons have a digital delay on your pedal boards ;)

    FWIW, this guy was basically how I started using the AX2 amp. I bought the one in this video from him for $25 (after he...
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    For small modern amps that have impressed me with...

    For small modern amps that have impressed me with their sound, I like the ZT lunchbox and the Boss Katana stuff. A guy I play with has a ZT and just gets amazing tone, then again he also has a...
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    In playing with this AX2 some more I think the...

    In playing with this AX2 some more I think the comments about EQing (and general parameter tweaking) may be a major factor. I noticed that many of the presets for Fender or blues amp sounds use a...
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