Anyone have a 90s SWR Basic Black?

[lavmonga]

Does anyone have an old USA SWR Basic Black combo amp? Mine just dropped output to the speaker. I could this piece broken off in the cab and I don’t know where I should solder it back into place. If anyone has, or can take a photo of their amp guts so I can find the piece, I’d appreciate it.

 

[agedhorse]

Somebody’s been into that already and hacked up a previous repair.

IMO, this isn’t a good DIY project because there is going to be a good amount of reverse engineering the previous work. If you happen to guess wrong, you could end up with a permanently non-working amp.

 

[lavmonga]

Ahh ok. What part implies it was messed with?

 

[agedhorse]

Ahh ok. What part implies it was messed with?

The entire attempt at the onboard crossover. I'm 99% sure that the amp didn't leave the factory looking like that.

This is what it was from the factory, I believe the part is AR3, BUT there are too many parts on your amp to match the factory schematic, and AR3 was PCB mounted That's why I think there is more going on here. I used to work for Fender (the owner of SWR at the time), and I couldn't help you without the amp in front of me because it looks modified and how it was modified is unknown.

AC2 is also incorrectly wired by looking at your chassis, there are also extra resistors that make no sense.

 

[bottomzone]

If you don't know what you're doing, then don't make the attempt.

 

[Axtman]

If you accidentally short something and blow the discontinued output transistors (2SC3264) you probably won't be able to find replacements.

 

[agedhorse]

If you accidentally short something and blow the discontinued output transistors (2SC3264) you probably won't be able to find replacements.

Almost all of these parts (both polarities) on eBay and Amazon and AliExpress are counterfeit knock-offs that are nothing like the original parts.

 

[Clumpy]

Not sure if this is the right string to respond to - I'm a new user - but my problem sounds similar to Lavmonga's. My SWR WorkingPro 12 volume decays while playing then stops making sound completely. When I turn it off then on again it plays fine for a while then does the same thing. Any ideas of what might be causing this? I'm guessing power supply transformer but don't know.

 

[agedhorse]

Not sure if this is the right string to respond to - I'm a new user - but my problem sounds similar to Lavmonga's. My SWR WorkingPro 12 volume decays while playing then stops making sound completely. When I turn it off then on again it plays fine for a while then does the same thing. Any ideas of what might be causing this? I'm guessing power supply transformer but don't know.

Has nothing to do with the transformer, that’s guaranteed.

Look at your other thread.

 

[Ramses3]

The entire attempt at the onboard crossover. I'm 99% sure that the amp didn't leave the factory looking like that.

This is what it was from the factory, I believe the part is AR3, BUT there are too many parts on your amp to match the factory schematic, and AR3 was PCB mounted That's why I think there is more going on here. I used to work for Fender (the owner of SWR at the time), and I couldn't help you without the amp in front of me because it looks modified and how it was modified is unknown.

AC2 is also incorrectly wired by looking at your chassis, there are also extra resistors that make no sense.

View attachment 7100794

Hi! I see there's a chance you might have the schematic for the Basic Black. Would you be able to share it? I got one in poor condition and with some missing components, and I really need the diagram to restore it. Thanks!

 

[agedhorse]

Hi! I see there's a chance you might have the schematic for the Basic Black. Would you be able to share it? I got one in poor condition and with some missing components, and I really need the diagram to restore it. Thanks!

Sorry, I can't share anything but small clips because the documentation still belong to my former employer and I don't have permission to share it.

 

[Ramses3]

Sorry, I can't share anything but small clips because the documentation still belong to my former employer and I don't have permission to share it.

Thanks a lot for the response! Would you be able to share the part showing the connection of the effects loop to the main board? Thanks!

 

[agedhorse]

Thanks a lot for the response! Would you be able to share the part showing the connection of the effects loop to the main board? Thanks!

I will look.

 

[Stefzouille]

Does anyone have an old USA SWR Basic Black combo amp? Mine just dropped output to the speaker. I could this piece broken off in the cab and I don’t know where I should solder it back into place. If anyone has, or can take a photo of their amp guts so I can find the piece, I’d appreciate it.

Hi, I stumbled across this forum by chance, and something caught my eye. I hope I can find an answer. Oddly enough, looking at your photos, I realize I have the exact same amp. Either it's a coincidence, or we both live in France and I'm the one who acquired this amp. I recognize it by the brown capacitor added in the middle of the other three, and especially by the two 5W and 7W resistors with the wire twisted on top, instead of the white ones. It's quite similar, and extremely strange.

 

[Stefzouille]

 

[Stefzouille]

Does anyone have an old USA SWR Basic Black combo amp? Mine just dropped output to the speaker. I could this piece broken off in the cab and I don’t know where I should solder it back into place. If anyone has, or can take a photo of their amp guts so I can find the piece, I’d appreciate it.

Yes, I just checked, you're from New York. So here we have 230V. No, it's not the same amp, but we have exactly the same circuit. It's a rolling coincidence, which means they come from the factory like this? I've seen other photos where, instead of the two 5W and 7W resistors (two each) on one side and the brown capacitor on the other, there were white ceramic resistors, but I don't know their values. What's with this strange circuit?

 

[agedhorse]

No way it came from the factory like that.

It’s been worked on, there are a lot of telltale signs including the untrimmed lead, heat shrink splices, wrong color wire ties (those weren’t around when the amp was built) and an incorrectly installed cap.

Is the power transformer the original factory part?

 

[Stefzouille]

Yes, it's originally 230V European. I insulated the cables; some were flattened. I'm mainly talking about what replaces the power resistors next to the large capacitors, which I replaced with 5W and 7W resistors. That's why I'm surprised to see the same setup on the gentleman who lives in New York, the one who opened this post, because there you can clearly see that it's exactly the same capacitor added in the same place, the two resistors twisted in the same way. Really strange, yes...

Given its age (1998), I suspect there have been some repairs since then, but what surprises me is seeing the same large brown capacitor oddly placed in the middle of the three; it shouldn't be there. And the two small 5W and 7W resistors instead of the white power resistors...?! What?!? lol

 

[Stefzouille]

No way it came from the factory like that.

It’s been worked on, there are a lot of telltale signs including the untrimmed lead, heat shrink splices, wrong color wire ties (those weren’t around when the amp was built) and an incorrectly installed cap.

Is the power transformer the original factory part?

Erf sanken is dead toniht bad manipulation fuse dead...

 

[agedhorse]

Not the stock transformer, I wonder if it is the same amp with the transformer changed to 230V primary?