Search found 1442 matches
- Wed Feb 28, 2024 5:21 pm
- Forum: Technical Discussion
- Topic: ....and Now for Something Completely Different!
- Replies: 55
- Views: 10742
Re: ....and Now for Something Completely Different!
Sadly, David is no longer with us.
- Mon Sep 18, 2023 6:25 pm
- Forum: Garage Talk
- Topic: Thinking about moving south
- Replies: 152
- Views: 77160
Re: Thinking about moving south
Yup, Wisconsin is hell, 9 months of winter with mosquitos the size of birds during the summer. At least we have beer, lots of beer... and more beer.
I hear ya tho, time to move to where the winters are not so severe.
John
I hear ya tho, time to move to where the winters are not so severe.
John
- Tue May 09, 2023 2:05 pm
- Forum: Technical Discussion
- Topic: High pulse power resistors
- Replies: 12
- Views: 1338
Re: High pulse power resistors
Hey Phil, I came out of the same industry and used 10k 1 watt carbon comps which became unobtanium, and which the supplier admitted only 3 factories in China were making them - and they were shite. The analog guys ended up using metal oxide in their place, specifically designed for the defib impulse...
- Wed Feb 15, 2023 2:38 pm
- Forum: Technical Discussion
- Topic: McIntyre Bluesbreaker
- Replies: 6
- Views: 908
Re: McIntyre Bluesbreaker
I built it early 90's, Jon was a great guy to talk to back then - before the internet. Parallel input was nice, bright amp, very loud - think of a trainwreck it was meant to be played loud for breakup. If I was to build it today, I think I would probably darken the 100k plate normal side and increas...
- Mon Oct 10, 2022 6:55 pm
- Forum: Technical Discussion
- Topic: What do R and C stand for in schematics?
- Replies: 18
- Views: 1734
Re: What do R and C stand for in schematics?
I can not express this enough, buy a breadboard, a handful of Rs and Cs, a few jfets, 9v battery, a cheap oscilloscope and signal generator. You'll learn more for a few hundred dollar investment than you will asking questions. What's your time worth? Put in the effort to visualize it instead of wait...
- Mon Oct 10, 2022 5:33 pm
- Forum: Technical Discussion
- Topic: What do R and C stand for in schematics?
- Replies: 18
- Views: 1734
Re: What do R and C stand for in schematics?
Why do you need an amp calculator? By simple inspection approximate gain is 20x, 10x and 66x (won't happen), you figure the attenuation and shelving frequencies... But what for? Me thinks this preamp is one of the worst sounding ever, absolutely no soul. I'll take "Let's help write a uni paper for $...
- Fri Oct 07, 2022 4:01 pm
- Forum: Technical Discussion
- Topic: Noise after mod
- Replies: 7
- Views: 854
Re: Noise after mod
Either your "new" bypass cap isn't ground referenced when out of circuit, or you are mixing grounds up and causing a loop.
- Fri Oct 07, 2022 1:34 pm
- Forum: Technical Discussion
- Topic: What makes high gain amps to have higher voltage gain thus higher peak dB gain?
- Replies: 32
- Views: 2788
Re: What makes high gain amps to have higher voltage gain thus higher peak dB gain?
The irony of all of this is that "high gain or distortion amps" in regard to the pre amps have less actual gain than a clean amp. Compare a diode clipped "Jose" mod clamped down to 12v to a SVT. Never thought of the SVT as high gain, but looking at the dB thru the amp it is greater than the "high ga...
- Thu Oct 06, 2022 6:52 pm
- Forum: Technical Discussion
- Topic: What makes high gain amps to have higher voltage gain thus higher peak dB gain?
- Replies: 32
- Views: 2788
Re: What makes high gain amps to have higher voltage gain thus higher peak dB gain?
Without knowing the past context, or care to, remember that dB is a ratio. That being said, what is the starting input voltage of the dB figures that you are asking about? There is a huge difference, for example, using a 0.01 v input instead of 1 v which is already a 40 dB discrepancy in the reporte...
- Fri Aug 19, 2022 2:43 pm
- Forum: Marshall Discussion
- Topic: Headfirst videos
- Replies: 4
- Views: 2569
Re: Headfirst videos
Mark, as a guy born in the 60's and a 20 something in the long hair metal days of the 80's, I approve of his amp tones. Only watched a couple of vids, wish there was something like that when I first started amp work in the early 90s and used to call guys like Jon McIntyre for help. He is honest with...
- Fri Jul 29, 2022 8:18 pm
- Forum: Technical Discussion
- Topic: Shipping costs going up?
- Replies: 25
- Views: 2516
Re: Shipping costs going up?
The worst part is that all of the added "fuel surcharges" never go away, they just become the "norm"...
- Thu Jun 16, 2022 1:31 am
- Forum: Technical Discussion
- Topic: Spectrum Analysis Recommendations
- Replies: 9
- Views: 906
Re: Spectrum Analysis Recommendations
In my past engineering life, a RF engineering God and fellow tube amp builder swore by the Analog Discovery for his home use. Additionally, there is supplemental analysis software such as this: https://youtu.be/7yXUbU5bSGw which will do exactly what you are asking.
John
John
- Wed May 25, 2022 10:01 pm
- Forum: Technical Discussion
- Topic: Low Pass Filter: Math vs Practice
- Replies: 16
- Views: 2079
Re: Low Pass Filter: Math vs Practice
I'll be a little more cynical and say that the 470k r is simply a carry over from the isolation resistors used in this position of a 2 channel amp, think old bassman or plexi. In reality, it adds some input impedance isolation to the following gain stage as the preceding volume pots are varied makin...
- Wed Mar 23, 2022 8:36 pm
- Forum: Garage Talk
- Topic: 13 years?
- Replies: 46
- Views: 55396
Re: 13 years?
Miles, been a long time, I remember those days. Been here almost 15 yrs, although I don't build or post anymore. Sometimes life "just gets in the way"... Always enjoyed your Marshall clips, recording stories, Scarface, insight and build note banter with Jana... To me that was the great period of TAG...
- Sun Feb 10, 2019 12:05 am
- Forum: Garage Talk
- Topic: Stuff I'd like to have
- Replies: 32
- Views: 2979
Re: Stuff I'd like to have
Man, I'd like to have the building knowledge that I've seem to have lost in my 5 year Hiatus... and it wasn't even good time off! Good to see familiar names still here!