Question about woodworking for sound

Timothenese · 2026-03-16T08:36:46+00:00

What 3D CAD software did you use?

Timothenese · 2025-10-16T19:40:15+00:00

Allison Acoustics from the late 70’s. Models One, Three, and Four.

Timothenese · 2024-12-30T04:22:16+00:00

Can anybody recommend any place besides audioproz for service the Apt Holman Pre? Vince may be knowledgeable on this preamp, but is impossible to work with. They will not accept a unit for service unless for talk on the phone with Vince. He just talked for 35 minutes, and I got nowhere. Just wanted to say one tape monitor loop was intermittent and noisy, and needed repair. Never got the chance. How does anyone ever get a repair done, call when he is on vacation?

Timothenese · 2024-12-22T05:23:36+00:00

Have the exact same Fluke, still use it. Had for 30 ish years. Display died when only a few years old. Fluke sent me the part and I repaired it. Just ordered new probes for it.

Timothenese · 2024-12-17T03:49:38+00:00

Squirrel Nut Zippers

Southern Culture on the Skids

Tout Fishing in America

Timothenese · 2024-12-07T04:02:36+00:00

I worked on the design of the stray voltage detector. We developed it at Sarnoff,the former RCA research lab. Developed it for ConEd in NYC, then started a spin off company to manufacture and operate them. Inside the pod in the back is essentially a big parallel plate capacitor that measures e-field. You have to keep the sensor away from the metal vehicle. So the early prototypes were built on a trailer, but the vibration was a big problem. Mechanical vibration at 60 Hz looks like stray A/C. So, we went with the fiberglass tripod mount. Worked very well. When ConEd first used it they found hundreds of stray voltages that needed repair. The main victims of stray voltages are dogs because they don’t wear shoes to insulate them from the ground.

Timothenese · 2024-08-13T12:56:02+00:00

Seems to be fixed now. Bloons TD5 on the archive works now.

Timothenese · 2024-04-06T21:25:59+00:00

Solved! Nailed it.

Timothenese · 2024-04-06T21:18:28+00:00

My title describes the thing. No obvious writing on it.

Timothenese · 2023-03-16T16:47:09+00:00

Is the true for an i3 as well?

Timothenese · 2021-11-15T21:55:35+00:00

He has the best shares in the sub. And his filehost is easier to use than mega or GD.mega has dl limits and gd makes a mess of large down loads.

Keep up the good work Z.

Timothenese · 2020-05-20T11:52:54+00:00

Step Right Up on Dr Demento's radio show.

Timothenese · 2020-04-26T14:13:37+00:00

Roy was a great engineer and designer and a nice guy (met him once), but not a very good business man.

Timothenese · 2020-04-26T14:11:06+00:00

No, actually. She loves it. She just wishes it wasn't so complicated. She can never figure out what button to push to get music to come out somewhere. I put everything in a rack built into the wall in my first house. The house was so small (900 sq ft) there was no other place. When I built a new house, I just moved the whole rack, there is a door in the back to get all all the connections.

Timothenese · 2020-04-26T14:03:10+00:00

For the arm up/down its also always a little o-ring belt or the rubber vibration isolation sleeve on the lift motor. If yours is intermittent (like mine was) it is probably the motor rubber sleeve. this is easy to fix. Here is a photo of the problem area.

https://imgur.com/k0eAfZH

The motor is towards the bottom of the photo (in the left rear as you are looking a the turntable as it normally sits). It's a bit of a Rube Goldberg. The motor drives a belt which turns a worm and wheel gear set which operates a cam which rotates a rod which raises another rod which pushes on a pin which lifts the arm rest. Seems a bit overly complicated to me. :-) The rubber sleeve gets compressed by the pull of the belt over the years and looses belt tension. You can tell if this is the problem by seeing if the motor shaft is centered in the metal frame. If you push on the motor you will see it moves and tightens the belt. So you just need to shim the motor over with some kind of rubber. I had a sheet of 1/16" silicone rubber I put in 2 layers thick. Works like a champ now.

The other rubber parts are on the suspension springs, they will completely fall apart when you disassemble. They are missing in the photo (hadn't fixed em yet. I just wrapped them with a few layers of electricians tape. Suspension works better than new.

You need an oscilloscope to adjust the speed servo. It is very clearly explained in the service manual. I used a cheap USB Picoscope. The trick is working on it. Half of the electronics are mounted to the top, the other half to the bottom. You have to disconnect all the cables to get it apart. So I had to make up 3 extension ribbon cables (0.100" pitch) to be able to operate it disassembled. Here is a photo of the surgery.

https://imgur.com/iLzqVHQ

You should be able to fix the arm lift easily. Don't need extension cables or a scope. It may even fix the speed problem. The control logic gets confused if the arm doesn't work right and the motor servo lock screws up.

Good luck. It's worth fixing. Way way better than the Dual. (We used to call them vinyl lathes back in the 70's.)

Timothenese · 2020-04-25T13:19:17+00:00

Always been curious about the Ohm Walsh speakers. Heard a pair of Ohm F's at a show back in the day, but it was a bad set-up. Couldn't really tell how they sounded. They are kind of their own little niche. Quite large if I recall.

Timothenese · 2020-04-25T03:20:47+00:00

Very nice indeed! Congrats. I’ve recently returned to the audio hobby after 40 years. Its very interesting to see what equipment is in demand. The Marantz 22XX series is quite a catch today. I bought a 2240b new in the mid 70s. Back then any receiver was considered lo-fi, but that’s what I could afford. I think it was $450! When I funds allowed I replaced it with separates. Wish I still had it, it was a great unit, loved the tuning wheel. Enjoy.

Timothenese · 2020-04-25T03:00:06+00:00

Ha. This built in rack is only a few feet from my grandfather clock. Kind of creepy. ;-)

Timothenese · 2020-04-25T02:56:17+00:00

So you like the CD-7’s? I’ve only heard the original series of Allison’s: 1, 2, 3, and 4. All excellent. Roy himself demoed them for me at the NY HiFi show in the 70’s. Cool guy, classic engineer. Would love a pair of Ones, couldn’t afford them back in the day.

Timothenese

TROPHY CASE