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Old 7th May 2008, 09:46 PM   #1
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Default Hour Meter for a Tube Amp..

I've been thinking about this for a while. Everyone always talks about how many hours are on their tubes. It takes X amount of hours for them to sound their best etc. Same for PIO coupling caps and some filter caps. Does anyone make or has anyone implemented a simple little hour meter that counts time when the B+ is applied? Something similar to what's seen on a tractor or industrial engine.

I've never seen one for such an application.
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Old 7th May 2008, 10:06 PM   #2
nhuwar is offline nhuwar  United States
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Yes they are still made you can get them off Mcmaster carr. They are made for voltages from dc 12 to 24 volts and 120 vac.
Hope this helps

Nick
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Old 7th May 2008, 10:49 PM   #3
gni is offline gni  United States
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There is a great selection at the site:

$30 to $160

AC and DC versions from 10 to 220 V

Wow! That is a find.
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Old 8th May 2008, 12:44 AM   #4
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you can get a "Hobb's Meter" on EBay -- used to track the number of hours on your Continental 500 HP Twins.

Click the image to open in full size.
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Old 8th May 2008, 01:03 AM   #5
nhuwar is offline nhuwar  United States
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If you like the retro old look.
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File Type: jpg hour meter 2.jpg (14.0 KB, 371 views)
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Old 8th May 2008, 01:05 AM   #6
nhuwar is offline nhuwar  United States
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Or the normal simpson look

Which is what I like.



Nick
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File Type: jpg hour meter.jpg (12.8 KB, 339 views)
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Old 8th May 2008, 07:01 AM   #7
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Try a farm surplus place - $5 for a typical hour meter.

Cheers!
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Old 8th May 2008, 07:28 AM   #8
nitrate is offline nitrate  United Kingdom
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I have implemented a PIC based one using the non-volatile flashram in the PIC. It counts minuits using an error resistant rolling code from when it was first powered up and cannot be reset. It is good for 16 million minuits. Not intended for audio use it was origanally a kind of spy chip to protect my former employer against rouge warranty claims on electronic ignition systems we built. The code never got used in anger as we went into liquidation soon after i cobbled it together but i still have it. It displays the power on time on an LCD at switch on, then shows a company splash screen followed by execution of whatever code ( if any ) that may be of use elsewere. The timer uses internal interupts but no I.O so the chip can be put to other tasks when running. If i implement it into a more useful form EG volume/source selection, remote ect I'll let you all know and maybe post the code somewere on DIYAudio.com. I bet sombody else has done it elsewere tho....

Leigh
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Old 8th May 2008, 07:44 AM   #9
oshifis is offline oshifis  Hungary
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I have an old Panasonic VCR (AG6810S) that has a hour meter in the front. It is manufactured by Fuji Ceramics, type is TM2 and counts up to 5000 hours. Looks like a tiny thermometer, a gap is moving in a quicksilver bar. The part is plugged in a socket (1 1/2" pin distance) and I heard somewhere that such components can be reversed so they start counting over.
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Old 8th May 2008, 08:23 AM   #10
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Quote:
Originally posted by oshifis
I have an old Panasonic VCR (AG6810S) that has a hour meter in the front. It is manufactured by Fuji Ceramics, type is TM2 and counts up to 5000 hours. Looks like a tiny thermometer, a gap is moving in a quicksilver bar. The part is plugged in a socket (1 1/2" pin distance) and I heard somewhere that such components can be reversed so they start counting over.

Interesting,That sounds like a component I found in my junk box long ago..it was a small glass tube,with tinned/plated ends,with leads soldered on it. I never could figure out what it was,but now I suspect it was a similar hour-meter!
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