Pretty much finished the Peavey 215 cab. I got Tap Plastics to make me 2 custom bezels for the ports, and found some 4x4 port tubes online to stick in the bezels. Used liquid nails to glue them in, then put a bead of silicone after to make sure they sealed tight. Rewired everything using some old Monster speaker wire I had since the '90s. Only played for a few min. but these Faital's sound great. Just needs a grill, I have the original, but it's kind of tweaked and I think I'll make a new one.

thanks, it looks ok for what it is.

So for the last 6 weeks my Deluxe Memory Boy has been out of action. Dry signal, but the delay side was dead. I tried everything, I rebiased it, swapped and jumpered various BBD stages and I checked the pots and connections and various test points - all seemed fine.A friend of mine loaned me his Memory Toy for a couple of shows and I had a horror attack when at last practice it had the exact same issue. I decided my PSU must be killing Memory Boy's and took it out, ordered a new supply over the weekend.Before I boxed them both I plugged the Memory Toy into the new supply - WORKED FINE! Holy shit, I thought, and plugged in my Memory Boy. BOOM! Whined like crazy, so I just rebiased the BBD's and it's back again. I guess the DC-DC converter for the BBD stages wasn't getting enough voltage. Always check your power supply, kids.

Took a chance on an old Brüel & Kjær 4007 microphone advertised as "low output." The capsule assembly was secured with loctite, so I didn't try to remove it until I went through the electronics. I couldn't find a schematic anywhere, so I traced it out:I replaced nearly every component in the thing with no improvement, so I went for the capsule. A little bit of heat, a small piece of leather to protect the surface, and some channel-locks were able to unscrew it. The foil layer was dented and creased and probably touching the backplate in some areas. Definitely nothing I can fix myself. I've got an inquiry into DPA, which took over the B&K mic division years ago. I suspect it will cost more than it's worth and I'll probably just sell this thing to cut my losses.

Nate Dort wrote:I grabbed a Rocktron Velocity 300 power amplifier from ebay for $100, sold as "Channel 2 not working." It's a 150 W x 150 W stereo power amplifier in a 1U rack case, or you can run it 300 W bridged mono into 8 ohms. Looking at the photos in the listing, they had it switched to "bridged" mode, which disables the channel 2 outputs and routes all the power to channel 1. I had a hunch that they didn't know how to use the thing and assumed it was broken since there was no signal on channel 2. Well, it showed up yesterday and I was right. This things works perfectly and looks nearly new, except for a minor cosmetic dent in the back near the AC inlet. I'm guessing this was an unsold B-stock item or something, because it's in the original box with all documentation.I'm going to use this thing with the Ampeg SVT-IIP that I just fixed and put them in a small 2U rack case. Curious to see how it compares to the GK 800RB.Snagged a nearly-new Rocktron Mainline a couple weeks ago, also sold as "Channel 2 not working." It's basically the same as the Velocity, but with a switchable line/instrument level input. Output stage is exactly the same (same PCB). This time there was actually something wrong with this one. Channel two looked like it was dropping half of the output waveform, so I immediately suspected the main output stage. One of the Sanken SAP15 output transistors was bad. Subsequent research tells me that the SAP series are notorious for blowing the integrated emitter resistor on the die, which is why they were discontinued. The fix is to use the Sanken STD03 series, which are the same darlington pair, but they omit the emitter resistor. Same pinout, just in a slightly smaller package. I just had to put a 0.22 ohm 5W resistor between the emitter and the output. I went ahead and did all four transistors across both channels while I was in there.This fixed the output, but I think I figured out why one SAP15 blew in the first place. The fan didn't seem to be coming on at all, so it probably overheated. There s a thermistor in series with the fan that triggers the fan to come on at 65 C. The 24 V rail (which runs the fan) completely failed while I was testing the new transistors. That rail also runs all the signal routing relays, so I also lost output completely. The LM7824 regulator was getting really hot. I powered the rail from an external supply and it wasn t drawing excessive current, even with the fan running. New 7824 fixed it. Everything is working well now.The Mainline seems to be voiced slightly different from the Velocity, just based on looking at frequency sweeps on the AudioPrecision. The knob positions don't directly translate between the two units, so it's not flat with everything at 12 o'clock like the Velocity. More like 9 o'clock on the Resonance and 3 o'clock on the Presence control.

Nate Dort wrote:Whoops, I bought a Hiwatt Custom 20 project today. Gonna need to fix it and build a cabinet for it now.This thing arrived yesterday, packed about as well as I've ever seen anything packed before.The original PT smelled like burning, so I popped off the bell covers and sure enough, all the tape was melted around the core. I'm 99% sure the PO wired the new Mercury Magnetics PT incorrectly, which is why it blew up again. The MM transformer has a 260-0-260 (center-tapped) winding for the B+ voltage. He should have used just the 260 and 0 connections to get ~360 VAC after the full-bridge rectifier. Instead, it looks like he used both 260 connections into the bridge and floated the CT (if the two scraps of red wire going into the bridge are any indication), producing 732 VAC after rectification. That blew up the first filter cap. That's when he gave up, I imagine.I traced out the small PSU board and got everything hooked up the way I thought it should go. I can't think of a way to wire the PT to the SP4T mains voltage selector switch to make it universal input though. It's a dual-primary PT, not a single primary with a bunch of taps. Not a big deal, but it would have been nice to get it close to stock functionality.Found some new 22 uF 450 V caps at the local electronics store, so I replaced the missing one and the existing one on the board for good measure. Fired it up and voltages looked good and nothing smoked, so I moved it upstairs and plugged it into a cab. JFC, this thing sounds phenomenal.My dad has a bunch black walnut and a decent woodworking shop at his house, so I might enlist his help to build an enclosure for this thing. Maybe finish it with some Tru-Oil that I have leftover from another project.Either that, or a genuine torlex snakesking cabinet.

Torlex or GTFO

weezy wrote:Torlex or GTFOThat's going on the next round of shirts.

Rodabod wrote:Nate Dort wrote:Took a chance on an old Brüel & Kjær 4007 microphoneMay be worth emailing Tim Campbell and asking if he wants to have a crack at it.DPA ignored my inquiries. Ended up selling it for $75 more than I paid. I'll let the next guy worry about it.

Nate Dort wrote:Took a chance on an old Brüel & Kjær 4007 microphoneMay be worth emailing Tim Campbell and asking if he wants to have a crack at it.