Adding a bias meter to Zenlite

Michael Rothacher · 30th January 2003, 12:19 AM

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

Nelson Pass · 30th January 2003, 01:10 AM

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

carpenter · 30th January 2003, 02:26 AM

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

moe29 · 30th January 2003, 03:33 AM

so we have the Germans to thank for the
cool blue?!

Nelson Pass · 30th January 2003, 04:05 AM

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.

Michael Rothacher · 2nd February 2003, 01:32 AM

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.

moe29 · 2nd February 2003, 02:29 AM

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
--------------------
playing sad music today,
R.I.P. hero astronauts.
-------------------------------

Michael Rothacher · 2nd February 2003, 02:52 AM

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.

Karen · 2nd February 2003, 03:45 PM

Mike, have you considered a meter to track the output? Could be very Muuuhahahahaha! (more movement, also)

Michael Rothacher · 2nd February 2003, 04:09 PM

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

30th January 2003, 12:19 AM	#1
Michael Rothacher www.audiohobby.com diyAudio Member Join Date: May 2001 Blog Entries: 3	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

30th January 2003, 02:26 AM	#3
carpenter Paper mache horn fabricator diyAudio Member Join Date: Mar 2002 Location: Oregon City, Oregon	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

2nd February 2003, 03:45 PM	#9
Karen diyAudio Member Join Date: Sep 2001 Location: Foresthill, CA	Mike, have you considered a meter to track the output? Could be very Muuuhahahahaha! (more movement, also) __________________ ..K

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30th January 2003, 01:10 AM	#2
Nelson Pass The one and only Join Date: Mar 2001	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

30th January 2003, 03:33 AM	#4
moe29 diyAudio Member Join Date: Dec 2002 Location: Florida	so we have the Germans to thank for the cool blue?!

2nd February 2003, 02:29 AM	#7
moe29 diyAudio Member Join Date: Dec 2002 Location: Florida	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 -------------------- playing sad music today, R.I.P. hero astronauts. -------------------------------

2nd February 2003, 02:52 AM	#8
Michael Rothacher www.audiohobby.com diyAudio Member Join Date: May 2001 Blog Entries: 3	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.

2nd February 2003, 04:09 PM	#10
Michael Rothacher www.audiohobby.com diyAudio Member Join Date: May 2001 Blog Entries: 3	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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