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Adding a bias meter to Zenlite
Adding a bias meter to Zenlite
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Old 30th January 2003, 12:19 AM   #1
Michael Rothacher is offline Michael Rothacher  United States
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Adding a bias meter to Zenlite
Default Adding a bias meter to Zenlite

Would inserting a DC Ammeter in series with one of the bulbs be really bad for my musical mojo? I'd like to add a simple meter to my Zenlite.

Not a necessarily a watt/power meter - and yes, I realise it is a constant current design so monitoring current will be a little boring as the meter won't actually move. But I'd like to hear your ideas just the same. I've seen watt meters that use a rectifier at the output - why is this bad? I've seen the boos, hisses, and screeds, but never really got a good sense for why.

I think a meter would add that last little bit of muahahaha!

Thanks

Mike


/mike - listening to laurie anderson, big science for inspration
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Old 30th January 2003, 01:10 AM   #2
Nelson Pass is offline Nelson Pass  United States
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Adding a bias meter to Zenlite
That's spelled MuuuHahahaha

Adding some resistance (or a meter) in series with the
light bulb won't hurt a thing. You can also place a
meter across the Mosfet (with some resistance in series).

Don't forget the blue light.


pass/ - the original light was green, but Germans demanded
blue
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Old 30th January 2003, 02:26 AM   #3
carpenter is offline carpenter  United States
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Adding a bias meter to Zenlite
Default meter?

How about adding a meter to the faceplate to measure dc offset? I'm always curious about mine. Since it's 4 or more volts out when cold, it would move as the amp heated up.....

If it were to move to far off center (likely when the room is hotter) I'd know that something's amiss.

John
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Old 30th January 2003, 03:33 AM   #4
moe29 is offline moe29  United States
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so we have the Germans to thank for the
cool blue?!
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Old 30th January 2003, 04:05 AM   #5
Nelson Pass is offline Nelson Pass  United States
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Adding a bias meter to Zenlite
Quote:
Originally posted by moe29
so we have the Germans to thank for the
cool blue?!
Yeah. They wanted the amps to match their Wadias.

pass/ - likes blue anyway.
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Old 2nd February 2003, 01:32 AM   #6
Michael Rothacher is offline Michael Rothacher  United States
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Adding a bias meter to Zenlite
Default Spelling MuuuHahahaha

Airfare to Vegas: $180.00
Losing at the slot machines: $100.00
Hot dog at CES concession: $ 5.00

Finally getting Nelson Pass's autograph - priceless!

Thanks Nelson, and the spelling indeed appears to be correct!

/mike - has Ray Bradbury's autograph, Richard Feynman, now Pass...Life is good.
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Old 2nd February 2003, 02:29 AM   #7
moe29 is offline moe29  United States
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Mike,
That is a classic autograph!

...i was trying to figure out what was signed...
is that the X patent? or XA product lit?



moe29
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playing sad music today,
R.I.P. hero astronauts.
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Old 2nd February 2003, 02:52 AM   #8
Michael Rothacher is offline Michael Rothacher  United States
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Adding a bias meter to Zenlite
It's the "Like Peanut Butter And Chocolate" white paper for the XA series amps & Nelson's business card. He also signed a copy of the 11/91 Stereophile. This was the issue where he was interviewed by Tom Norton and first eluded to his interest in single-ended solid state designs. He was a real gentleman, and even pronounced Muuhahahaha for my wife - in mad scientist fashion!


/mike - likes peanut butter, chocolate, and blue lights.
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Old 2nd February 2003, 03:45 PM   #9
Karen is offline Karen
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Mike, have you considered a meter to track the output? Could be very Muuuhahahahaha! (more movement, also)
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Old 2nd February 2003, 04:09 PM   #10
Michael Rothacher is offline Michael Rothacher  United States
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Adding a bias meter to Zenlite
Karen:

Yes, I thought about this kind of arrangement, but I don't know if having this circuit across the output will be bad for my Feng Shui. What do you think?

Thanks

Mike
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