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Other Vintage Household Electrical or Electromechanical Items For discussions about other vintage (over 25 years old) electrical and electromechanical household items. See the sticky thread for details.

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Old 27th Oct 2021, 3:45 pm   #1
TwelveAxSeven
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Default Bell & Howell 8D-655, amplifier question

Hello all,

I am looking for info on the Bell & Howell 8D-655, which I understand was the model that preceded the 655 TQ1 series, or 655Q. Not quite sure.

I think the 8D-655 had a decent valve amplifier that can be reused, while the TQ1 was solid-state.

Does anyone have any insight please?
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Old 27th Oct 2021, 4:29 pm   #2
wd40addict
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Default Re: Bell & Howell 8D-655, amplifier question

The 8D prefix marks when production of the Anglicised projectors moved from the UK to Japan. I have the 8D644 which is based on the 644, the amplifier is still valve based but has been changed to use a solid state doubler rather than an EZ81 for HT rectification and a transistor has been added as an extra preamp stage for the optical sound.

The following TQ1 series used a low voltage lamp for greater screen illumination and all transistor anplifiers.
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Old 27th Oct 2021, 6:57 pm   #3
TwelveAxSeven
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Default Re: Bell & Howell 8D-655, amplifier question

@wd40addict: Great to know thank you
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