8mm Forum: BRK vs. BRK :/...

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Topic: BRK vs. BRK :/...

Elyas Tesfaye
Jedi Master Film Handler

Posts: 520
From: Winnipeg, Manitoba, Canada
Registered: Nov 2012

posted February 10, 2015 01:53 PM

Hi all,

my exciter lamp went out and I noticed the previous one was a BRK. When looking on ebay, I found a better offer of lamps as a lot, but they are all BAKS. I, however, also noted that they are the same V and Amp rating as the BRK (42, 0.775 Amp). Should I get them anyways or not :/? Thanks in advance for your always awesome help [Big Grin]

!!!

Elyas

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Alexander Vandeputte
Expert Film Handler

Posts: 243
From: Belgium
Registered: Nov 2009

posted February 10, 2015 02:51 PM

No those lamp types are not interchangeable. BRK lamps have a vertical filament, whereas BAK lamps have a horizontal filament. The exact form of the filament is projected onto the sound track by means of the optical sound reader's optics. So if you use the wrong type, you will have very low sound output or no sound at all.

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Dominique De Bast
Film God

Posts: 4486
From: Brussels, Belgium
Registered: Jun 2013

posted February 10, 2015 04:24 PM

Lamps manufacturers were vicious by making almost identical lamps that differ only by the filament position. I was once trapped and realized my mistake thanks to Maurice from this forum who told me the trick...

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Dominique

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Maurice Leakey
Film God

Posts: 5895
From: Bristol. United Kingdom
Registered: Oct 2007

posted February 11, 2015 02:44 AM

The exciter lamps used for Elmo and Eiki/Elf projectors differ from those used by Bell & Howell projectors.
They have the same ratings, fitting, and look exactly the same at quick glance.
However, the lamps in Elmo & Eiki/Elf are used on their sides, whilst those in Bell & Howells are used in a vertical position.
Therefore, this is why the filament in Elmo & Eiki/Elf lamps is vertical, the filament position in a Bell & Howell lamp is horizontal.

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Maurice

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Dave Groves
Jedi Master Film Handler

Posts: 508
From: Southend on Sea, Essex, UK
Registered: Feb 2015

posted February 11, 2015 04:28 AM

Maurice, I've just learned something. It must be sheer luck that I've bouht the right type all these years. You learn something new every day!

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Dave

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Paul Mason
Jedi Master Film Handler

Posts: 540
From: Aldershot, Hampshire, UK
Registered: Nov 2013

posted February 11, 2015 04:55 AM

Dave,
The same 4V, 0.75A lamps are known in the UK as G/27 (vertical filament, horizontal mounting) and G/29 (horizontal filament, vertical mounting)

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Paul.

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Elyas Tesfaye
Jedi Master Film Handler

Posts: 520
From: Winnipeg, Manitoba, Canada
Registered: Nov 2012

posted February 12, 2015 02:49 PM

Hi all,

As always, "God Bless [Smile]

!!!" to the members of our awesome forum for their priceless assistance [Big Grin]

!!!

Elyas

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