Search found 1047 matches
- Fri Jan 20, 2017 6:21 pm
- Forum: Technical Discussion
- Topic: Filter Caps on Mains?
- Replies: 12
- Views: 1924
Re: Filter Caps on Mains?
I got some input from a guy who claims he was around back in the glory days of analog: You are on the right track. The HP product line was heavily used when I was in the HF/VHF radio design labs in the 70’s pre digital era. The only digital item in the plant used to crank formulas and run chart data...
- Wed Jan 18, 2017 12:29 am
- Forum: Technical Discussion
- Topic: Filter Caps on Mains?
- Replies: 12
- Views: 1924
Re: Filter Caps on Mains?
It seems like you never get the same answer from two people when you talk about electronics.
I found a page about old radios, and it said Y caps were used to keep interference OUT. I suppose a person's view of a component's purpose depends on what he's used to using it for.
I found a page about old radios, and it said Y caps were used to keep interference OUT. I suppose a person's view of a component's purpose depends on what he's used to using it for.
- Tue Jan 17, 2017 9:49 pm
- Forum: Technical Discussion
- Topic: Filter Caps on Mains?
- Replies: 12
- Views: 1924
Re: Filter Caps on Mains?
I think we're on different pages here. Y caps are used to kill EMI, not spikes.
- Tue Jan 17, 2017 5:36 pm
- Forum: Technical Discussion
- Topic: Filter Caps on Mains?
- Replies: 12
- Views: 1924
Re: Filter Caps on Mains?
I found an interesting page referring to these things as "Y capacitors." Evidently, the risk of shorting is well known, and ceramics are most likely to do it. There are special "safety caps" for this purpose, and the affordable ones are designated "Y2." They are supposed to resist shorting from powe...
- Tue Jan 17, 2017 4:44 pm
- Forum: Technical Discussion
- Topic: Filter Caps on Mains?
- Replies: 12
- Views: 1924
Re: Filter Caps on Mains?
I'm wondering why anyone would bother filtering AC in, when there are big ol' caps to filter the DC down the line. Could it be to prevent the exposed AC lines from "broadcasting" RF inside the cabinet, to other components that might pick it up?
- Tue Jan 17, 2017 4:37 pm
- Forum: Technical Discussion
- Topic: Filter Caps on Mains?
- Replies: 12
- Views: 1924
Filter Caps on Mains?
Fun new question here. I dug out my old HP 3300A function generator to get it working, and I found there was a dual capacitor (0.01 uF per side) across the AC in wires. The internal caps had a common ground, and their other legs went to neutral and hot. The reason I learned about the cap is that it ...
- Mon Jan 16, 2017 1:32 am
- Forum: Technical Discussion
- Topic: Silicone Insulation v. Teflon?
- Replies: 9
- Views: 2332
Re: Silicone Insulation v. Teflon?
No probes for me. I've made the wise decision to risk death from cancer instead of being violated with a motorized camera.Phil_S wrote:Year on the can, hemi's for sure. Ouch. All of us older guys know what's in store for the younger ones. No one warned me about the first physical after I turned 50
- Fri Jan 06, 2017 7:48 pm
- Forum: Technical Discussion
- Topic: Silicone Insulation v. Teflon?
- Replies: 9
- Views: 2332
Re: Silicone Insulation v. Teflon?
I'm asking about silicone. I already know about teflon. Just wondering if people use silicone in amps.
- Fri Jan 06, 2017 12:03 am
- Forum: Technical Discussion
- Topic: Silicone Insulation v. Teflon?
- Replies: 9
- Views: 2332
Silicone Insulation v. Teflon?
Sorry for not posting in like a year. I was on the can.
Today for the first time I learned there is such a thing as silicone-insulated wire. I got all excited. I had to come here and ask: is this a good alternative to teflon?
Today for the first time I learned there is such a thing as silicone-insulated wire. I got all excited. I had to come here and ask: is this a good alternative to teflon?
- Wed Apr 13, 2016 11:02 pm
- Forum: Technical Discussion
- Topic: Mind-Blown: Orange Drops have Polarity?
- Replies: 31
- Views: 9828
Re: Mind-Blown: Orange Drops have Polarity?
It sounds like anyone who has a dead-quiet amp that doesn't oscillate should ignore this.
- Wed Apr 13, 2016 6:09 pm
- Forum: Technical Discussion
- Topic: Mind-Blown: Orange Drops have Polarity?
- Replies: 31
- Views: 9828
Mind-Blown: Orange Drops have Polarity?
I was Youtubing to kill a few minutes, and I came across a video which instantly changed my worldview. The guy in the video said non-electrolytic capacitors like Orange Drops have a polarity, and that if you ignore it, you can get hum and oscillation. True, or is he smoking old carbon resistors? htt...
- Wed Mar 30, 2016 3:18 pm
- Forum: Technical Discussion
- Topic: Going From 15 Watts to 7 to Improve Tone: Worth it?
- Replies: 9
- Views: 1303
Re: Going From 15 Watts to 7 to Improve Tone: Worth it?
Thanks for the schematics.
- Wed Mar 30, 2016 3:17 pm
- Forum: Technical Discussion
- Topic: Going From 15 Watts to 7 to Improve Tone: Worth it?
- Replies: 9
- Views: 1303
Re: Going From 15 Watts to 7 to Improve Tone: Worth it?
I don't expect a big reduction. Just thinking I would be able to turn the PPIMV up a little more and avoid the change in sound the PPIMV causes when you crank it down. The more I think about it, the more I like this idea. I like the idea of a lighter head. If that's the only significant change, it's...
- Mon Mar 28, 2016 11:29 pm
- Forum: Technical Discussion
- Topic: Going From 15 Watts to 7 to Improve Tone: Worth it?
- Replies: 9
- Views: 1303
Going From 15 Watts to 7 to Improve Tone: Worth it?
1. What happened to the malware warning? I miss my malware. 2. I decided what to do with the amp parts I have sitting around. I built a 15-watt amp with four 6BM8s and a Bassman preamp, and I love it. I am thinking I would like to build a 7-watt version (two fewer tubes) so the output will be a litt...
- Thu Mar 10, 2016 8:10 pm
- Forum: Technical Discussion
- Topic: Setting up a new bench - need some seasoned advice
- Replies: 25
- Views: 2817
Re: Setting up a new bench - need some seasoned advice
Sooner or later you will want to sit, so avoid my mistake. Before you build the bench, find a good stool or whatever, and have it handy when you do your design. Make sure your knees don't hit anything, and that your feet have a place to go. Someone suggested I make a bench with a replaceable MDF top...