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Author Topic: Bell & Howell 644 (641/642/643 et al) - External Speaker Connector Type
Steve Withnell
Junior
Posts: 9
From: Lytham St Annes, Lancashire, UK
Registered: Jul 2016


 - posted August 22, 2016 05:26 AM      Profile for Steve Withnell   Email Steve Withnell   Send New Private Message       Edit/Delete Post 
I had thought the speaker sockets were DIN types - but it appears they are something else, a bit odd ball like the power connector.

Anyone know what the make/model of the matching speaker side plug is?

TIA

Steve

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Novice maintainer of a Bell & Howell 644...

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Maurice Leakey
Film God

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


 - posted August 22, 2016 06:12 AM      Profile for Maurice Leakey   Email Maurice Leakey   Send New Private Message       Edit/Delete Post 
The speaker plug for this range of projectors has two pins for the speaker wiring and a larger plastic pin. When connected the large pin mutes the projector's internal speaker.

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Maurice

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Paul Mason
Jedi Master Film Handler

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


 - posted August 23, 2016 12:10 PM      Profile for Paul Mason     Send New Private Message       Edit/Delete Post 
The old Bell & Howell cabinet speakers are fairly common on Ebay so these would be a good source for the plugs.

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Paul.

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Maurice Leakey
Film God

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


 - posted August 24, 2016 06:10 AM      Profile for Maurice Leakey   Email Maurice Leakey   Send New Private Message       Edit/Delete Post 
It should be noted that the speaker plug to which we are referring was only used between 1961 and 1969 beginning with the 641/642/643/644.

The British made 601 was introduced in 1947 and was based on the pre-war American design. It was in a wooden box often referred to as a "blimp". It used a two-pin plug somewhat similar to the much later DIN plugs. The models ceased in 1957 with the 640.

In 1961 the models 641/642/643/644 were introduced and used a new type of plug which included a large pin which muted the projector's internal speaker when a separate external speaker was used. These progressed to the TQI which came out in 1969. These still used the same plug.

Things changed when the TQII model was introduced in the 70s. This used the standard 2-pin DIN plug which continued when the TQIII came out in the 80s.

The TQIII series eventually changed to using the ELC lamp and about the same time the speaker plug became a Post Office type 2-ring quarter inch jack plug.

I say all this to point out that 12" Bell & Howell extension speakers through the years came with plugs which fitted the then current projectors, so it is very important to verify that a speaker comes with the plug that you want.

The most simple way to connect a speaker is to just insert the two bare wires into the two small holes, and to use a matchstick in the upper hole to mute the internal speaker. A suitable speaker should be 16 ohms for a valve based amplifier.

Not all green TQIII models had a DIN socket, some American versions for the UK market came with a socket for a jack plug.

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Maurice

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Paul Mason
Jedi Master Film Handler

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


 - posted August 25, 2016 05:13 AM      Profile for Paul Mason     Send New Private Message       Edit/Delete Post 
Here is a link to a 1960s speaker on Ebay of the type used with the 641 series. Note the Bell & Howell "overlapping squares" logo:

http://www.ebay.co.uk/itm/Bell-Howell-Speaker-for-B-H-Filmosound-16mm-Projector-in-original-case-/252508060380?hash=item3acaa73adc:g:n1AAAOSwGIRXZEuN

The TQII projectors appeared in 1973 which were superseded by the TQIII series from 1976.

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Paul.

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Steve Withnell
Junior
Posts: 9
From: Lytham St Annes, Lancashire, UK
Registered: Jul 2016


 - posted August 26, 2016 03:44 PM      Profile for Steve Withnell   Email Steve Withnell   Send New Private Message       Edit/Delete Post 
Thanks guys. I think I might swap the connectors out for a current standard.

Steve

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Novice maintainer of a Bell & Howell 644...

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David Guest
Phenomenal Film Handler

Posts: 1704
From: Lancashire, UK
Registered: Oct 2011


 - posted September 05, 2016 05:08 AM      Profile for David Guest   Email David Guest   Send New Private Message       Edit/Delete Post 
I have these jack plugs for this machine in stock

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