GussyLoveridge wrote: Fri May 07, 2021 9:04 am You can sell something for a profit and even a substantial profit without ripping someone else off.

I definitely don't price my repaired stuff above what the going rate is. If anything, I try to price a little low to sell it faster. The buyer usually gets a deal, and I don't have piles of stuff sitting around. And their stuff was just checked out by a tech, so it's usually in better shape than a comparable piece that has never been borken.

Nate Dort wrote: Fri May 07, 2021 11:31 am

GussyLoveridge wrote: Fri May 07, 2021 9:04 am You can sell something for a profit and even a substantial profit without ripping someone else off.

I definitely don't price my repaired stuff above what the going rate is. If anything, I try to price a little low to sell it faster. The buyer usually gets a deal, and I don't have piles of stuff sitting around. And their stuff was just checked out by a tech, so it's usually in better shape than a comparable piece that has never been borken.

Exactly. I guess that's the point I was trying to make.

GuyLaCroix wrote: Wed May 05, 2021 3:00 pm Welcome back, Nate. Always wonderful to see your work.

+1! good work!

Yet another SVT-III Pro:

"Power amp works fine, preamp doesn't pass signal"
The power amp worked in the sense that it amplified signal, but there was so much 120 Hz buzz that it was basically unusable. I found that every filter cap on the power supply had broken solder joints. Reflowed those, and it sounded good. Thermal camera showed one of the IRFP240 FETs was getting hotter than the others, so I replaced it and its associated 0.47 ohm ballast resistor. Temps looked good after that. Set the bias to spec.
Tested all of the tubes, and besides the fact that somebody had replaced the 12AU7 with a 12AX7, two of the five tubes were bad.
The preamp section worked intermittently, and I found broken solder joints on the input jack. Cleaned it up and tested it to 470 W RMS @ 9% THD+N.

Hey Nate - what is that program you're using in the second photo? USB scope kind of this or what?

I currently have an AudioPrecision APx525 analyzer on my bench while I work from home. One of the perks of my day job. That's AP's hardware-locked software, though they do have a new version that's compatible with 3rd party audio interfaces. It still costs $5k though: https://www.ap.com/analyzers-accessories/apx500-flex/

YIKES! $5K

Picks 465B back out of the gash.

I just fixed my La Pavoni Professional espresso machine wit ha percussion mallet. No shit.

The pressurestat was malfunctioning. It was either bad or just stuck. I took off the bottom of the machine and whacked it with a gong mallet. Now the pressurestat works again. Hooray.

Ampeg BA-115T


Picked it up for $40 on CL, not working.
Found a cold solder joint on the EQ selector switch, and a few more on various pots. Ended up replacing the bass and treble pots because the knurled shafts had been smashed and the knobs didn't reliably stay on anymore.
Also bypassed the headphone jack, because they're notorious for failing on these things and since it's just a switched jack in series with the speaker, you get no sound at all.
This thing has a regular ol' solid-state 100 W BA-115 PCB in it, but shoehorns a single 12AU7 on a daughter board at the input for some gimmicky tube mojo. Sounds OK for a rehearsal amp, but it's pretty heavy and bulky.

Making Y cables using Mogami star quad cable since I have a a few feet of it left. Just using one of the two wires for both hot and cold signals. I mean it's simple, just run some current to make sure you are using the right wire. Only problem is the ground wire needs to be have one of those heat shrink things on most of it it so the three wires can run into the housing of the plug. Wish me luck.