sci.electronics.repair@googlegroups.com

Today's topics:

* Slide projector - discharge lamp light source? - 4 messages, 4 authors
http://groups.google.com/group/sci.electronics.repair/t/92ad0ef39983a160?hl=en
* Slightly odd output stage configuration. Update - 2 messages, 2 authors
http://groups.google.com/group/sci.electronics.repair/t/2588a3ac4e8b297d?hl=en
* just click the link or copy and paste to browse the bellow website link you
can yearn money for online jobs and home based jobs and yearn $100-$500/day -
1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/3711c37beadda1cc?hl=en
* Cheap Wholesale Thomaswlde real leather Handbags - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/b9041070501fdabb?hl=en
* Did you see this fat sheboon on the Steve Wilkos show? - 1 messages, 1
author
http://groups.google.com/group/sci.electronics.repair/t/d2292380f90e90b9?hl=en
* Has Lady Veteran ever masturbated over a Victoria's Secret catalog? - 3
messages, 3 authors
http://groups.google.com/group/sci.electronics.repair/t/fe4285b8a6f3bc79?hl=en

==============================================================================
TOPIC: Slide projector - discharge lamp light source?
http://groups.google.com/group/sci.electronics.repair/t/92ad0ef39983a160?hl=en
==============================================================================

== 1 of 4 ==
Date: Tues, Mar 1 2011 3:10 pm
From: "Dave Plowman (News)"

In article <ikiune$ahq$1@news.eternal-september.org>,
William Sommerwerck <grizzledgeezer@comcast.net> wrote:
> Discharge lamps are not continuous-spectrum sources, and would probably
> not work very well when projecting color images. And with mercury, you'd
> have to filter out the UV, not to mention the ozone generated by the UV.

They're used for lighting on film and TV so can be pretty good. As well as
for DLP etc projectors.

--
*A 'jiffy' is an actual unit of time for 1/100th of a second.

Dave Plowman dave@davenoise.co.uk London SW
To e-mail, change noise into sound.

== 2 of 4 ==
Date: Tues, Mar 1 2011 6:20 pm
From: David Nebenzahl

On 3/1/2011 9:25 AM William Sommerwerck spake thus:

>>> Discharge lamps would no doubt be more efficient. But...
>>> not only would you have to correct for color balance, but
>>> the bulb would have to be "mated" to the projector's optical
>>> system.
>>
>> Large theater projectors are still an arc light?
>
> I'm not sure. I seem to recall that some use some form of tungsten lighting.
> Don't hold me to it.

Nope; xenon arc. Like this:
http://www.alibaba.com/product-free/110488871/XENON_ARC_HOUSE_XENON_SHORT_ARC.html

--
The phrase "jump the shark" itself jumped the shark about a decade ago.

- Usenet

== 3 of 4 ==
Date: Tues, Mar 1 2011 6:33 pm
From: "Arfa Daily"

"William Sommerwerck" <grizzledgeezer@comcast.net> wrote in message
news:ikja7h$qc5$1@news.eternal-september.org...
>>> Discharge lamps would no doubt be more efficient. But...
>>> not only would you have to correct for color balance, but
>>> the bulb would have to be "mated" to the projector's optical
>>> system.
>
>> Large theater projectors are still an arc light?
>
> I'm not sure. I seem to recall that some use some form of tungsten
> lighting.
> Don't hold me to it.

I seem to recall that modern cinema projector lamp houses make use of
short-arc xenon discharge lamps, but as you said, don't hold me to it ...

Arfa

== 4 of 4 ==
Date: Tues, Mar 1 2011 6:49 pm
From: "tm"

"Arfa Daily" <arfa.daily@ntlworld.com> wrote in message
news:r0ibp.62105$VI6.20174@newsfe29.ams2...
>
>
> "William Sommerwerck" <grizzledgeezer@comcast.net> wrote in message
> news:ikja7h$qc5$1@news.eternal-september.org...
>>>> Discharge lamps would no doubt be more efficient. But...
>>>> not only would you have to correct for color balance, but
>>>> the bulb would have to be "mated" to the projector's optical
>>>> system.
>>
>>> Large theater projectors are still an arc light?
>>
>> I'm not sure. I seem to recall that some use some form of tungsten
>> lighting.
>> Don't hold me to it.
>
>
> I seem to recall that modern cinema projector lamp houses make use of
> short-arc xenon discharge lamps, but as you said, don't hold me to it ...
>
> Arfa
>
>

Speaking of HID lights, does anyone know where I can get a schematic for a
Philips EUC 120 C/00 Lampdriver?

Thanks,
tm

==============================================================================
TOPIC: Slightly odd output stage configuration. Update
http://groups.google.com/group/sci.electronics.repair/t/2588a3ac4e8b297d?hl=en
==============================================================================

== 1 of 2 ==
Date: Tues, Mar 1 2011 6:47 pm
From: "Arfa Daily"

So, today, I did the mods that the customer was asking for. The value and
type of a coupling cap in the overdrive channel was changed. The input
circuitry was stripped and simplified to standard Fender style - i.e. a 68k
series resistor from input jack to the grid of the first 12AX7, and a 1M
grid return to deck. The fixed negative bias to the grids of the output
tubes was disconnected, and the injection point decked, and the cathodes
were lifted from deck and returned instead via a 100 ohm 4 watt resistor,
bypassed by 100uF.

I also put an additional 1 ohm resistor in the cathode path, so that I was
able to measure the idle current of the output stage. This settled at about
130mA, or just over 30mA per tube, which was exactly what the author of the
mod notes suggested it should be.

I have to say that after carrying out these mods, the amp did seem to have a
much 'smoother' more Fender-like sound, and was still capable of producing
pretty much its full normal output of around 30 watts. I do not have a
sufficiently 'musical' ear to know if the revised sound is what the owner is
looking for, but it did seem to have a very sweet sound, to me. He is
picking it up tomorrow morning, so I guess I should know if he's happy with
it, in fairly short order ...

Arfa

== 2 of 2 ==
Date: Tues, Mar 1 2011 7:23 pm
From: "Phil Allison"

"Arfa Daily is a Fuckwit "
>
> So, today, I did the mods that the customer was asking for. The value and
> type of a coupling cap in the overdrive channel was changed. The input
> circuitry was stripped and simplified to standard Fender style - i.e. a
> 68k series resistor from input jack to the grid of the first 12AX7, and a
> 1M grid return to deck.

** Does nothing.

> The fixed negative bias to the grids of the output tubes was
> disconnected, and the injection point decked, and the cathodes were lifted
> from deck and returned instead via a 100 ohm 4 watt resistor, bypassed by
> 100uF.

** Ruins the amp.

The cathode voltage now rises up with increasing drive level and at full
drive biases the tubes almost completely off.

This result is gross waveform distortion of the crossover kind - same as
severely under biasing the amp.

Very bad mod.

> I also put an additional 1 ohm resistor in the cathode path, so that I was
> able to measure the idle current of the output stage. This settled at
> about 130mA, or just over 30mA per tube, which was exactly what the author
> of the mod notes suggested it should be.

** So fucking what.

That is only the idle current.

> I have to say that after carrying out these mods, the amp did seem to have
> a much 'smoother' more Fender-like sound, and was still capable of
> producing pretty much its full normal output of around 30 watts.

** Utter bullshit.

As anyone with a functioning scope, dummy load and eyes can see.

.... Phil

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== 1 of 1 ==
Date: Tues, Mar 1 2011 8:50 pm
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==============================================================================
TOPIC: Did you see this fat sheboon on the Steve Wilkos show?
http://groups.google.com/group/sci.electronics.repair/t/d2292380f90e90b9?hl=en
==============================================================================

== 1 of 1 ==
Date: Tues, Mar 1 2011 1:45 pm
From: Michael Gross

Lady Veteran wrote:
> On Mon, 28 Feb 2011 06:15:59 +0100, "Peter Luskowitz" <peter@nola.orq>
> wrote:
>
>> In article <9n3lm6l4i147pi81ttqfaaf54ovckl82k9@4ax.com>
>> Lady Veteran <armyvet@bigfoot.com> wrote:
>>> On Sat, 26 Feb 2011 23:42:59 +0000, Lady Veteran
>>> <clamchelle69@yahoo.com.au> wrote:
>>>
>>> This idiot is trying to say I approve of this behavior. I reported it
>>> to it's ISP and sent it an email.
>> Why did you send it an email?
>
> I did that to let it (don't know if it is male or female) what I did.
> It did what I expected: it denied that it know what I was talking,
> then closed the Yahoo account.
>
> That pathetic piece of crap is not going to use my user ID to spread
> its hate.
>
> LV

Back in your cave, you old bat.

==============================================================================
TOPIC: Has Lady Veteran ever masturbated over a Victoria's Secret catalog?
http://groups.google.com/group/sci.electronics.repair/t/fe4285b8a6f3bc79?hl=en
==============================================================================

== 1 of 3 ==
Date: Tues, Mar 1 2011 3:30 pm
From: Michael Gross

Just Curious.

== 2 of 3 ==
Date: Tues, Mar 1 2011 11:42 pm
From: Checkmate

Warning! Always wear ANSI approved safety goggles when reading posts by
Checkmate. Oh, yeah... I should also mention that Michael Gross said the
following:
>
> Just Curious.

Just the "plus sized" section.

--
Checkmate
Copyright � 2011
all rights reserved

Read what others are saying about Checkmate!
____________________________________________________________________

"You have got to be the biggest butt fucking moron in this place.
You use socks and then admit to it? What the fuck is the point?"

-Wildhare
____________________________________________________________________

"You can sit there all you want and spit out all the denial you can
muster, it still doesn't change the fact that you are the current
king shit of the puppeteers in this group."

-Ragnar
____________________________________________________________________

"It's pretty obvious that if I'm such a dumbass then you are a
double dumbass"

-Ragnar
____________________________________________________________________

"The only thing you want to hold against me is your dong."

-Ragnar shares his latest homoerotic fantasy about me
____________________________________________________________________

== 3 of 3 ==
Date: Wed, Mar 2 2011 12:01 am
From: "Matthew Kruk"

"Michael Gross" <pigwiggler@yahoo.com> wrote in message
news:ikkrn4$1r3$1@speranza.aioe.org...
> Just Curious.

No.

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