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#1
Tubes and Hybrids / Re: Another standby switch thread
February 02, 2025, 01:01:51 PM
Ok now it makes sense why in another thread I suspected a tube and G1 had me check for heater voltage ⚡

I bet many innocent tubes are wrongly accused and framed  :trouble
#2
Hi Mr Joe afaik pretty sure nothing like that existed...however that is an excellent point in that there is or was a plethora of natural gas, propane, pipelines, petroleum in the area. 
I got lucky for some reason I never had to explain to law enforcement why I was sitting in an old heap behind a business by myself at 0200  :tu:

#3
Tubes and Hybrids / Re: Another standby switch thread
February 02, 2025, 08:49:58 AM
In contrast (apparently) TV tube heaters are (were) in series

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I guess my job now is to find out if my tube amp heater circuit is like an old TV or the 📻 radio in TV's car 🚗

 xP
#4
About forty years ago when I was still in college and working part time the university had afternoon/evening classes I guess it was geared towards working older people  xP

So anyway I was a 🦇 vampire staying up all night doing homework and playing guitar 🎸 etc and my routine had me going to bed 🛏� at about 0530.  I had found that Casper the friendly ghost 👻 came on like at 0500 and that was my SOP.

So what does all that have to do with anything?  :loco
At night in the small town it got quiet with the exception of an audible hum  :grr
Sometimes I would have the windows open I was in an upstairs room at the end of the house.  This (real or perceived) hum/pitch/monotone frequency tormented me to some end.  In fact I made a few nocturnal excursions around town looking for it.  I would drive around to different areas and shut the engine (slant six 66 Dart) off and sit and try to determine where it was coming from.
Spoiler alert: I never did find it or find out anything.
When I told my dad about it he said there was a composer that went crazy because of constantly hearing 440 or something  :trouble

xP
#5
I'm glad you were nice
I actually got scared when I saw you replied  <3)

 :lmao:
#6
Ok I tried it  :loco
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I got lucky I guess  :lmao:

Might be time to buy a lottery ticket  xP
#7
Well I got into somewhat of a pickle 🥒

I have three chapters to go in my little book before I can go on to the cool second book that has me playing with transistors and diodes and stuff but I hit a 🛣� roadblock.

The third from the last chapter was on bandpass filters so I ran into trouble with the impedance calculations of inductors and capacitaters and resistors in parallel.  Meanwhile I was like "what is all this j and theta crap"  :grr

I tried to get through it but ultimately admitted defeat and went back to a chapter in a book a did a few years ago so I'm midway through that.
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So all good it should be rewarding to get to the lab portion and see 🙈 how the 🥼 experimental 🧪 results compare.

There is a post by one of our esteemed members from near Australia 🦘 🌏 where he told someone what frequency to expect from a potentiometer and capacitater  xP so I may play around and see if I can figure out how he calculated that  :loco  :tu:


#8
Ok I went and redid the experiment this time using my scope to measure the voltage drop across the resistor at different frequencies and got some good results  :tu:
(bottom left)
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gratuitous scope pic

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 xP

So all I need now is a gif of Keanu going
"DUDE.....your meter can't handle it "

 :loco
#9
Here is an 🥼🧪 experiment I just did

I was really impressed how the measured hung right in there with the calculated

Unfortunately at 50 khz it went out the window
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Here is the "schematic"  :lmao:

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I know

I should have remeasured everything with my scope.   :grr
#10
Tubes and Hybrids / Re: Another standby switch thread
January 18, 2025, 12:58:30 PM
Well....I wasn't gonna mention it but since you brought it up  :tu:

I was reading this the day before yesterday and of course I instantly remembered you talking about your car radio

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Diagram and text Art Margolis

#11
Tubes and Hybrids / Re: Another standby switch thread
January 11, 2025, 09:52:19 PM
Well....you knew I was gonna do it  :tu:

Amp in playing mode
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Amp on standby

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 xP
#12
The Newcomer's Forum / Re: Voltron wattmeter
January 10, 2025, 06:46:44 PM
Holy cow 🐄🐮

Seeing the difference between LED and incandescent bulbs

 :grr  :loco
#13
The Newcomer's Forum / Re: Voltron wattmeter
January 10, 2025, 06:36:50 PM
Ok nm I didn't realize there were different models  :loco

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Instructions for the one I have

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Working in single phase mode

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 :dbtu:
#14
The Newcomer's Forum / Voltron wattmeter
January 10, 2025, 04:47:50 PM
Finally got around to trying this thing

I splurged a few bucks on a manual

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I hooked it to a box fan 

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So it has life but I couldn't get any response from the single phase mode aside from a small reverse movement I did reverse polarity to try it to no avail

I don't see any fuses anywhere on the unit or in the manual nor a power cord  xP

I need to calculate approximate watts of a dollar store box fan  :grr




#15
Tubes and Hybrids / Re: Another standby switch thread
January 10, 2025, 01:53:09 PM
Thanks
I guess it would help if I looked it up and determined what actually happens circuit wise with a standby switch  :grr like it shorts out the flux capacitor  :tu:

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 xP