Search found 1223 matches

by R.G.
Tue Mar 26, 2024 2:42 pm
Forum: Technical Discussion
Topic: The Lost Art of Cable Lacing
Replies: 16
Views: 438

Re: The Lost Art of Cable Lacing

I just use it because I think it looks nice. But apparently lacing is longer lasting than nylon zip ties, and less prone to cutting into the wires' jackets than zip ties. These are not likely to be reasons to use lacing in home-built gear, though. In industry, zip ties have the huge economic advanta...
by R.G.
Sun Mar 24, 2024 6:21 pm
Forum: Technical Discussion
Topic: Heater Wire Ground
Replies: 30
Views: 415

Re: Heater Wire Ground

@ Magnatron: Sorry for the flurry from bepone. It can get confusing when people get off into bickering over minutae. That little back and forth didn't help you much, I think.

Did you get anything useful to answer your question?
by R.G.
Sun Mar 24, 2024 5:10 pm
Forum: Technical Discussion
Topic: Heater Wire Ground
Replies: 30
Views: 415

Re: Heater Wire Ground

just a note for you because youre spending too much words for nothing i wound maybe several hundreds pts in my life and projected another several hundred .. And as a note for you, you are wasting your time and words too. You''re back to the argument that "well, I've seen this, and therefore, that's...
by R.G.
Sun Mar 24, 2024 4:56 pm
Forum: Technical Discussion
Topic: Heater Wire Ground
Replies: 30
Views: 415

Re: Heater Wire Ground

R.G. it is almost impossible to wind differently heater winding halves, how did you manage to make that? :mrgreen: if you want centre tap, it will be exactly on the centre bepone, it's an easy mistake to make. I've both done it on my earliest winds, and seen other beginners do it when they're learn...
by R.G.
Sun Mar 24, 2024 3:20 pm
Forum: Technical Discussion
Topic: Heater Wire Ground
Replies: 30
Views: 415

Re: Heater Wire Ground

ok for the lifted heaters.. but with humdinger pot you can see that hum is depending of the heater construction in the tubes and for all the preamp, mixed tubes is variable.. you can see where is minimum on the turn That is, you're re-stating what I said: hum comes from lots of places, and you can ...
by R.G.
Sun Mar 24, 2024 3:03 pm
Forum: Technical Discussion
Topic: Heater Wire Ground
Replies: 30
Views: 415

Re: Heater Wire Ground

There is no half turn in transformer heater winding :lol: :lol: For heaters you need to make very low number of the turns, and all the time you start and finish the turn on the same place..also is easy to make 3.15-0-3.15 , you are winding actually full number very close to the voltage (not to deci...
by R.G.
Sun Mar 24, 2024 1:35 am
Forum: Technical Discussion
Topic: Heater Wire Ground
Replies: 30
Views: 415

Re: Heater Wire Ground

I just think about the millions of top name amps that never fused the filaments. You're right about that. In fact, even the military (per my experience) didn't. It depends on your objectives. If you want to prevent certain losses, there are often technical ways to do that. If you're OK with sustain...
by R.G.
Sun Mar 24, 2024 12:48 am
Forum: Technical Discussion
Topic: The Lost Art of Cable Lacing
Replies: 16
Views: 438

Re: The Lost Art of Cable Lacing

If you had engineered at Bell, they would have been wired right, and that 400Hz inverter squeal wouldn't be in the headsets. 🙂 Sadly, I didn't get to do that. I wound up at [a Major Computer Company] instead of NASA, where I wanted to go: they weren't hiring. Neither was Electro-Harmonix, which was...
by R.G.
Sun Mar 24, 2024 12:41 am
Forum: Technical Discussion
Topic: Heater Wire Ground
Replies: 30
Views: 415

Re: Heater Wire Ground

It's not for the actual heater currents. It's in case the CT is grounded and one heater wire breaks or otherwise gets shorted to the chassis or signal ground. I've been doing this stuff since '65 and have never witnessed such a failure. Have you? This just sounds like one of those new age theoretic...
by R.G.
Sun Mar 24, 2024 12:27 am
Forum: Technical Discussion
Topic: Heater Wire Ground
Replies: 30
Views: 415

Re: Heater Wire Ground

actually power rheostat 5W is the best, but R.G. is stating that we need veery precise resistors, lets hear from him why. You're trying to put words in my mouth again. What I actually said was: (1) And the heater center taps are sometimes not too accurate. A couple of resistors may well make a bett...
by R.G.
Sun Mar 24, 2024 12:17 am
Forum: Technical Discussion
Topic: Heater Wire Ground
Replies: 30
Views: 415

Re: Heater Wire Ground

(1) And the heater center taps are sometimes not too accurate. A couple of resistors may well make a better center tap, with lower induced hum. Why do you think that the minimum hum is on the middle of very- too much precision- resistors ? Give us some technical reference and measurement. 8) Sure, ...
by R.G.
Sat Mar 23, 2024 11:41 pm
Forum: Technical Discussion
Topic: Heater Wire Ground
Replies: 30
Views: 415

Re: Heater Wire Ground

A hard CT requires two fuses, one on each end. That's twice you've said that recently. I think two fuses is redundant. The same filament current flows from top end of the filament winding through the filaments and back into the bottom end of the winding. No current flows into the center tap. It onl...
by R.G.
Sat Mar 23, 2024 5:41 pm
Forum: Technical Discussion
Topic: Heater Wire Ground
Replies: 30
Views: 415

Re: Heater Wire Ground

(1) And the heater center taps are sometimes not too accurate. A couple of resistors may well make a better center tap, with lower induced hum. (2) And using two resistors with a pot lets you tune the residual hum - assuming it's line frequency hum, not ripple. (3) And not tying the CT to ground mea...
by R.G.
Fri Mar 22, 2024 5:59 pm
Forum: Technical Discussion
Topic: The Lost Art of Cable Lacing
Replies: 16
Views: 438

Re: The Lost Art of Cable Lacing

We laced all wires in aircraft tailbooms but I don't want them closer than necessary in an amp. Yeah, as I said - you have to pick your wires to lace. Closer is better for low-impedance, high current lines that carry out-and-back currents. This keeps the magnetic field loop as small as possible. Fa...
by R.G.
Wed Mar 20, 2024 3:16 pm
Forum: Technical Discussion
Topic: The Lost Art of Cable Lacing
Replies: 16
Views: 438

The Lost Art of Cable Lacing

This popped into my head on a reply to another thread, and I thought it might be interesting to others. I love the look of neatly laced cables. True, long runs of parallel wires are not the greatest wire dress style, but then NASA did OK with it on lots of shots. I think it's a great way to corral h...