The SIT here is LU1014D or LD1014D. Still available on Aliexpress (genuine) for cheap. Also, Nelson Pass gave away a bunch a while ago. I bought like 600 of them to have enough to match 200 pairs. I have the IMS adapters to make them easy to mount like TO247.
Thread on how to assemble them.
https://www.diyaudio.com/community/threads/assembling-the-lu1014d-ims-to-247-adapter.373273/
I was experimenting with LU1014D over the weekend, the simplest circuit there is, with just 0.47 ohm from source to ground, and 8 ohm from drain to the positive power supply. Just like first and only watt circuit. 100k on the gate to ground, cap on input, cap on output. Powered by variac and standard FW power supply. It started sound great at about 3 volts on drain, just like recommended for Zen 8 or F3, however, the 8 ohm was overheating. Need to get bigger wattage resistor.
Try a 12v halogen lightbulb for the resistor. 🙂
FFT looks pretty good.
FFT looks pretty good.
Just got an idea! I got lots of old tubes, their filament could be used too, most likely.
I think it was used in the 'starving student headphone amp'.
I think it was used in the 'starving student headphone amp'.
Very cool experiment! What sort of power supply are you using? An SMPS with a filter might kill the hum.
Now that's one spiffy looking bookshelf X! Good luck with crossover. I am sure it will sound great.
On the Bench Tonight is my cat who is enjoying a nice warm amp power nap.
On the bench tonight was the PMC inspired foamcore TL now with a passive crossover from the Vanguard speaker. The tapered TL gives the Vanguard design bass extension down to 50Hz. Listening to it now and it sounds wonderful. A deep rich bass register is suddenly available. Cabinet is 14in tall x 14in deep vs the 12in tall and 8in deep of the Vanguard. I had built this cabinet years ago when I was using an active setup with the DC28F tweeter.
Behold what's on the Bench tonight!:
A lot of empty space for future projects.
I am in the middle of re-organising all the Labs stations for better productivity. It was impossible to navigate Lab 1's desk area as it was too full of parts, projects, general things - not very conducive to enjoying working there.
More cleanup is planned. I have another smaller space on my immediate left, and further down the line, I will move a complete smaller desk on my right to extend the workspace. Currently, there are boxes on my left at my foot, and more boxes on my right which also sports a little shelved cabinet. I need to move all of these and clean up the smaller desk to even envision physically moving it around the main desk.
When I do, it will be Glorious.
Some of the past projects have been boxed up and stored.
I moved all tools except the scope further back in the storage shelf, liberating the main workspace. Whether I will put the hot air station and soldering iron and pump on the desk is still to be determined.
What are your tips and tricks to getting organised and more productive as well as making the activities more enjoyable?
A new crossover production sample is on its way. Hopefully will be on my bench in a few days. This is for the speaker with the ribbon tweeter.
A production sample of the crossover for the Sig 60 is also coming:
Here’s a crossover from the LSA Signature 50, which many people simply love the sound of - it’s a lot simpler but still uses high quality parts on a real PCB:
The Sig 50 is in about the same price bracket as the Bose 301, which I recall cost about $500 back in 1989. I actually liked how the 301 II sounded. My parents had a set, but surprised how amazingly cheap looking the crossovers were made. Here’s a 301 crossover:
A production sample of the crossover for the Sig 60 is also coming:
Here’s a crossover from the LSA Signature 50, which many people simply love the sound of - it’s a lot simpler but still uses high quality parts on a real PCB:
The Sig 50 is in about the same price bracket as the Bose 301, which I recall cost about $500 back in 1989. I actually liked how the 301 II sounded. My parents had a set, but surprised how amazingly cheap looking the crossovers were made. Here’s a 301 crossover:
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Was checking some of the more affordable ribbon tweeters online. Only found Beston/Dayton as lowest. Good enough for a start, I guess.
My Phillips shoe box 3 way speaker have some electrolytic cap in Woofer
Rest are all film[ made in Holland ] , Heavy Gauge AirCore Inductor [ built by Peerless India] , Resistors are Carbon Film in twitter other are wirewound [made by dont know who]
I had impression old days they spent more on crossover