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Old 3rd January 2018, 02:25 AM   #11
Tubelab_com is offline Tubelab_com  United States
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Location: West Virginia panhandle
I built a breadboard prototype for what will become a few new amplifiers. This prototype is for evaluating tubes, transformers, and operating conditions.

The first picture shows it with GE 6550A tubes making about 70WPC in triode mode. The second picture shows it with 7403 tubes making 100 WPC in triode mode.

This video shows it annoying the neighbors through speakers at full crank! AKA "4 minutes of LOUD"

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Tubelab, it's 5 year mission. To explore strange new tubes, to seek out new circuits and topologies, to boldly go where no tube has gone before......
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Old 13th January 2018, 09:57 PM   #12
VenusFly is offline VenusFly  Australia
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I repurposed an old digitech amplifier that only draws 6 watts at idle to amplify a cheap and nasty chinese wireless doorbell that wasn't loud enough.

I was also going to throw out a set of loudspeakers which weren't of any use to anyone but reused them for the doorbell.

Well its bloody well loud enough now! Big Ben strikes hard in our house.

I'll put it on a timer for now to save on power. But seeing as we have a solar power system here I don't see why I can't increase the power output even further and make the whole house shake whenever the doorbell is rung. *rubs chin*

I'm thinking of improving it by making up a hanging 12 inch open baffle loudspeaker that I can hang from the wall and let the wall act as part of the speaker with a high efficiency driver and running it from a SLA battery with a trickle charger. But I do have some spare 8 inch drivers laying around with a box that I could convert into an open baffle loudspeaker simply by removing the back, I just then need to stash some electronics inside of it and glue a piece of wood on the back to keep it away from the wall by a cm or two.

Last edited by VenusFly; 13th January 2018 at 10:02 PM.
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Old 13th January 2018, 10:11 PM   #13
Wavebourn is offline Wavebourn  United States
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Location: Pleasant Hill, CA
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I replaced 20 faders in my mixing console. In order to do so I had to design and order PCBs.

Old faders from vintage TOA were scratchy. New ones are deadly quiet. I used double pots in parallel, for reliability.
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The Devil is not so terrible as his math model is!
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