bluesboy

It's the biggest one I've been up close to. Most of the dust devils around are as you described "personal sized"

The trucks are fine but it sure shook the job trailer.

Talk about weather we are building a equipment center in Moses Lake Washington. By Monday It's supposed to be up 114 degrees here. This afternoon a couple of big dust devils blew through here. It's like being next to a mini tornado.

I separated the amp and preamp as far as I could. The hum seems to have been diminished. You can't really hear it until both the volume and the gain are at 3 o'clock.

Nice call. I will try that.

All of the line level inputs in both preamps are dead quiet.

Yes

Yes the GG pre with the Transcendent phono pre behaved the same way.

I tried the IsoMax between the amp and preamp and between the TT and the preamp. The hum is still there with the power amp shown. But when I hook up the 2A3 amp (on top of the corner horn) the phono section in the preamp is dead silent.

What is CIC?

I finally figured out how to attach photos. I had exceeded the attachment capacity.

The problem is not with the wall outlets as the phono hum goes away another power amp is used. I've tried a Jenson isolation transformer between preamp and the amp and between the TT and the preamp with no affect. I took pictures and sketched the layout. I can't find a way to attach.

I just ordered 2 of the test plugs from Jenson.

Thanks for the help. I already have a Jenson C1-2RR isolation transformer. I'm wondering what would happen if I installed the transformer between the output of the turntable and the input of the preamp.

Over the past year and a half I've assembled 4 Transcendent Sound kits. I built the Mini Beast power amp, the Grounded Grid preamp, phono pre amp and most recently the new Slider pre amp with a phono section. The sound of these OTL amps is nothing short of amazing. My speakers are hybrid Khorns using Altec Altec 511Bs and 902 drivers for the mids and Beyma tweeters that I built about 15 years ago. One problem though. With both the Grounded Grid/phono pre combo and the phono section of the Slider I'm hearing what seems to be a ground loop hum. I swapped power amps ( 2A3 amp) and the hum goes away. Same result when I tried an old Yamaha ss receiver. You can't hear the hum with music playing just slightly between tracks. The hum increases with volume. These amps are otherwise dead quiet through the other line inputs even with the volume turned all the way up. I've tried cheater plugs on all components and installed an isolation transformer that cost me 200 bucks in between the amp and preamps with no results. Any ideas?

Are you going to build Klipschorn style bass bins? If so Altec 511B horns would be a better fit.

I second the Transcendent OTL option. I've gone through many vintage tube and SS amps since I built my Altec/Klipsch hybrids about 15 years ago. I have to agree with Coytee the OTL amps are the best sounding system I've ever heard. In the past year and a half I've built the Mini Beast (old version) power amp, Grounded Grid preamp and the TS phono preamp. I just recently built Bruce's new Slider preamp that replaced the GG and the phono preamp. The Slider has a phono section built in.

The large wood horns appear to be recreations of large format Altec multicell horns. The black horns below look like Altec 511B horns.

The check's in the mail.

Put me down for the first Zephyronie that comes off the line!

That's one thing I don't miss about North Carolina. Going for days without power and AC after hurricanes.

Warther is amazing. And here I thought I was a woodworker.

The props are roughed out on an end mill through an incremental process to achieve a 45 degree twist over the length of the prop using a 1" diameter ball end mill. So you would have to re position the prop 1/8" to 1/10" for each pass with a twist each time to get the overall 45 degrees. And all of that is just for rough in. The rest of the shaping is done by hand with a file.

Engine blocks- Aluminium Heads- Aluminium Gas and oil tanks-Brass Push rods-Aluminium Piston rings-Cast iron Centrifugal flyweight governor (hit & miss engines)-Brass Cranks- Steel Pistons- Aluminium Cylinders- 12% leaded steel

Yes he machines every piece of those engines including the gears. Too bad I can't talk him into getting on the computer to explain some of these processes such as machining gears.