8V 40mA bi-pin lamp (Marantz)

[Tim Schwartz]

Hello all,

Anyone know of a generic lamp that is an 8 volt, 40 mA bipin type?
These are used as source indicators in receivers like the Marantz 2270
and 2275. The 6.3 volt 7380 is readily available, but won't last long
running on 8 volts, and gets too hot as well.

Of course a reliable vendor who sells them would be just as good.

Many thanks,
Tim Schwartz
Bristol Electronics

 

[Phil Allison]

"Tim Schwartz"

Anyone know of a generic lamp that is an 8 volt, 40 mA bipin type? These
are used as source indicators in receivers like the Marantz 2270 and 2275.

** Gee - a small bi-pin lamp is just begging to get replaced with a white
LED.




..... Phil

 

[Trevor Wilson]

Hello all,

Anyone know of a generic lamp that is an 8 volt, 40 mA bipin type?
These are used as source indicators in receivers like the Marantz 2270
and 2275. The 6.3 volt 7380 is readily available, but won't last long
running on 8 volts, and gets too hot as well.

Of course a reliable vendor who sells them would be just as good.

Many thanks,
Tim Schwartz
Bristol Electronics

**I've found that owners of those old Marantz recievers are only too
happy to spend some extra bucks on replacing ALL lamps with LEDs. That
includes the stereo and source indicator lamps. The payoffs are huge.
They include:

* Far lower power consumption and consequent minimised damage to the
plastic housing that contains the dial back-lighting.
* Far, far more attractive dial lighting, if the LEDs used are blue ones.
* Indefinite (or at least very long) life-span for the lighting.

I've found that Lumileds™ work extremely well, due to their wide
dispersion characteristics. It requires some extra effort for the
repairer though. You can purchase plug-n-play replacements from eBay, if
you can't be bothered doing your own work.

 

[Phil Allison]

"Arfa Daily"

Although of course, care needs to be taken that the lamps are actually
being fed with DC.

** LEDs are, believe it or not, DIODES !!

So they can be used on low voltage ( ie 6.3V ) AC supplies with only a
series resistor.

Put two of 'em in reverse parallel and the supply voltage can be much
higher.

They come in all colours too: red, orange, yellow, green, blue and purple.

Some ingenuity may be needed to get the best result in each case, but it
well worth not having to search high and low for special, low current tiny
bulbs.



.... Phil

 

[Leif Neland]

Phil Allison kom med følgende:

"Arfa Daily"



** LEDs are, believe it or not, DIODES !!

Having LEDs run on one half-phase of AC can cause flicker.

It can be seen on cheap christmas decorations, which flicker
annoyingly, especially at the perifical vision, which is optimized to
see quick movements of e.g. predators. If you look at the light
directly, the flicker is less or not noticable, because at that angle
the eye wants details, not speed.

It might be less noticable at 60Hz than the european 50Hz ac.

So it might be advisable to rectify the ac either full wave or just a
diode and a cap.

IMHO the lights turning off slowly also looks more cool than an led
turning off abruptly

Leif

 

[Phil Allison]

"Leif Neland"

Having LEDs run on one half-phase of AC can cause flicker.

It can be seen on cheap christmas decorations, which flicker annoyingly,
especially at the perifical vision, which is optimized to see quick
movements of e.g. predators. If you look at the light directly, the
flicker is less or not noticable, because at that angle the eye wants
details, not speed.

** For typical red bezels or indicator lights, it is simply not visible.

It might be less noticable at 60Hz than the european 50Hz ac.

** I am posting from Aussie land - we have 50 Hz.

So it might be advisable to rectify the ac either full wave or just a
diode and a cap.

** The lack of visible flicker was surprising to me.

It tried red and white leds with the same result.

IMHO the lights turning off slowly also looks more cool than an led
turning off abruptly

** Neon bezels have been going off fast since, like forever.




.... Phil

 

[Trevor Wilson]

Although of course, care needs to be taken that the lamps are actually
being fed with DC. In many items using pea bulb indicators and back
illumination, they are fed with AC straight off the tranny, or sometimes
via a series resistor whether AC or DC. This means that if you drop the
current by swapping to LEDs, the voltage will rise. I have also found
that it is hard to match the 'colour' of small bulbs with LEDs,
particularly when they are deliberately under-run to produce a more
'lemon' coloured light. Things like tuning meters just don't look right
if the light behind them is too white. And even with wide angle LEDs,
the light dispersion is sometimes not enough to 'fill' an area with
light, resulting in uneven illumination.

**All quite true, however, I was specifically referring to the Marantz
products and Lumileds™. The Marantz blue dial looks stunning when
backlit via blue LEDs. Far, far better than the original lamps and with
vastly lower currents and, consequently, heat. The original lamps are
rated at 8 Volts @ 200ma each. In some Marantz models, there is 7 or 8
of the suckers! The heat generated warps the plastic housing containing
the backlighting. Lumleds™ deliver an even 120 degree spread of light
and are thus an excellent choice for backlighting in these
circumstances. Particularly given they can be run at around 10ma each.

I recently replaced a number of the feature lamps on my pinball table's
playfield with LEDs. To replace the ones that shone through clear
plastic diffusers, so were normally 'white', I used warm white LEDs with
a water clear lens. I then diffused the dome by rubbing it with some
very fine wet and dry paper, and then added some yellow felt tip. This
took the output from warm white to a colour very similar to a tungsten
lamp, which produced illumination much closer to the original bulb.

Arfa

**Cool.

 

[Phil Allison]

"Arfa Dickhead Daily"

It is to some of us. I find the PWM'd LED flicker of road works cone-top
beacons very annoying,

** WTF has that got to do with my comment ?????????????????

**** of you pathetic pommy fool.




.... Phil

 

[Phil Allison]

"Arfa Daily"

Yes. However, they are not renowned for having a very high PIV, so whilst
you would probably get away with just a series resistor at low AC,

** Jesus FUCKING CHRIST -

this IDIOT just DOES NOT READ !!!!!!!!!

 

[Black Iccy]

That aspect can be mitigated by
having a conventional diode in inverse parallel, but this will result in a
flicker at half the supply frequency that Phil can't see, but some of us
can, or by putting another LED in inverse parallel, which will conduct on
the opposite half cycle producing light, and clamping the reverse voltage
across the first diode to the value of the forward voltage of the second
diode, different, of course for different colours.

Surely, it will be at the _SAME_ frequency but exist as a light
source for only half the period (duty cycle). N'est-ce pas?

 

[[email protected]]

Hello all,

Anyone know of a generic lamp that is an 8 volt, 40 mA bipin type?
These are used as source indicators in receivers like the Marantz 2270
and 2275. The 6.3 volt 7380 is readily available, but won't last long
running on 8 volts, and gets too hot as well.

Are you sure they are bi-pin lamps? I own a couple Marantz receivers of that vintage (2215 and 2275), and they used "fuse lamps" which have the same dimensions as a 3AG fuse.

Of course a reliable vendor who sells them would be just as good.

The fuse lamps are readily available on eBay. You can also get them from All Electronics in Van Nuys, California; the 8V lamps are $1 each or $8.50 for 10, while 6V and 12V lamps are slightly cheaper.

 

[Leif Neland]

Phil Allison sendte dette med sin computer:

"Arfa Dickhead Daily"




** WTF has that got to do with my comment ?????????????????

**** of you pathetic pommy fool.

Have you had your Coprolalia disgnosed properly?

The treatment could be botox at the vocal cords (would it help for
typing? Possibly in the hands instead) or brain surgery.

Do you know how you got it?

If we know your bad behaviour is caused by a disease, it is easier to
forgive.


Leif

 

[Mike Tomlinson]

The treatment could be botox at the vocal cords (would it help for
typing? Possibly in the hands instead) or brain surgery.

He'd have to have a brain in the first place to operate on.

 

[Phil Allison]

"Arfa Dickhead Daily"

If you knew anything about anything, you would have understood that
traffic cone lights use LEDs, flashed at around 30 Hz,

** I live in Sydney.

The subject is LED bezels.

I was speaking from REAL experience - not making stupid guesess like you.

And YOU are the man with defective colour vision and gods know how many
other genetic defects.

BTW:

How many red LEDs have YOU used to replace the bezel lamps in Fender amps ??

There is no sign of flicker.

Surprising but true.


.... Phil

 

[Phil Allison]

"Arfa FUCKWIT Daily"

"Phil Allison"

No, it's YOU who either does not read,

** FFS - you REPEATED the info in MY post back to me !!!

You pompous, bullshitting, fucking nut case.



..... Phil

 

[Phil Allison]

"Arfa Daily"

"dave"

Which is exactly what I said.

** But not in the post that "dave" replied to.

My god you are a bullshitting ass.


.... Phil

 

[Trevor Wilson]

Are you sure they are bi-pin lamps? I own a couple Marantz receivers
of that vintage (2215 and 2275), and they used "fuse lamps" which
have the same dimensions as a 3AG fuse.

**The 6.3 Volt bi-pin lamps are used for input selection indication and
for the stereo beacon. The dial backlights are fuse style, 8 Volt 200ma
types.

The fuse lamps are readily available on eBay. You can also get them
from All Electronics in Van Nuys, California; the 8V lamps are $1
each or $8.50 for 10, while 6V and 12V lamps are slightly cheaper.

**Except that the OP wanted bi-pin lamps, which are not difficult to obtain.

 

[Phil Allison]

"Black Iccy"
"Arfa Fuckwit Daily"

Surely, it will be at the _SAME_ frequency but exist as a light
source for only half the period (duty cycle). N'est-ce pas?

** AD is a colossal, bullshitting moron.

The repetition rate is 50Hz or 60Hz, same as the field rate of a regular (
interlaced) TV.

Got an sine wave generator on your bench with 2.5 V rms available ?

Connect a LED across the output and sweep the frequency across the range
from 20 to 100Hz or so and see what happens.


.... Phil

 

[Leif Neland]

Phil Allison kom med denne ide:

"Black Iccy"
"Arfa Fuckwit Daily"


** AD is a colossal, bullshitting moron.


The repetition rate is 50Hz or 60Hz, same as the field rate of a regular (
interlaced) TV.

If you are talking about CRT-TV's, the phosphor(?) coating have
afterglow, to reduce flickering.

On the corner of the eye, the flickering is visible for some people on
some monitors.

The afterglow time varies depending on what the monitor is constructed
for. The old IBB green monitors had a very long afterglow to make the
image comfortable for wieving.

Got an sine wave generator on your bench with 2.5 V rms available ?

Connect a LED across the output and sweep the frequency across the range from
20 to 100Hz or so and see what happens.

When doing so, try different wavelengths, intensities and viewing
angles.

Flicker sensitivity varies between people.
When you are tired, you are more sensitive.

Perhaps your condition makes you less sensitive for flicker and proper
behaviour.

Leif

 

[Phil Allison]

"Leif Neland"

** Same as you - pig brain.

If you are talking about CRT-TV's,

** Yep.

When doing so,

** No **YOU** need to do the fucking test !!!!!!!

Cos I have done it many times already

You fucking, asinine, Kraut pile of shit.





..... Phil