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 Post subject: Re: Bell & Howell push pull 25C5 amp
PostPosted: Dec Mon 31, 2018 3:57 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 411
Location: Olympia, Washington
Here is a picture of the interior of a model 535 projector with the hot chassis tube amplifier talked about.Image


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 Post subject: Re: Bell & Howell push pull 25C5 amp
PostPosted: Jan Thu 03, 2019 2:20 am 
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Joined: Nov Wed 30, 2016 7:35 pm
Posts: 5393
Location: Sunbury, Ohio 43074
I think you could build a 6L6 amplifier from scratch for less fussing than you're doing ..........

btw, thanks for the interior photo of the projector..... brings back memories. I used to rebuild those things during a stint at an A/V house back in the day., Many a new worm gear.

Every work on one of the B&H 300 series? Rebuild that gearbox ... lol about 1,000,000 individual parts in there, mostly too small to see.

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Preserving the hist. of electronics, one boat anchor at a time! :)
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 Post subject: Re: Bell & Howell push pull 25C5 amp
PostPosted: Jan Sun 06, 2019 4:08 am 
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Location: Olympia, Washington
I've worked on the 300 series before. When I went through the Bell & Howell projector repair training put on by the factory guys, they mentioned the 300 and earlier series. Basically they said "without the special jigs/tools, don't even attempt to take apart the projector head".


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 Post subject: Re: Bell & Howell push pull 25C5 amp
PostPosted: Jan Sun 06, 2019 6:20 am 
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Joined: Nov Wed 30, 2016 7:35 pm
Posts: 5393
Location: Sunbury, Ohio 43074
Unfortunately, we DID have the jigs lol. They were actually kind of fun in a warped, twisted way. But you'd better have set aside enough time .... it wasn't something you could rush

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Preserving the hist. of electronics, one boat anchor at a time! :)
https://www.bbtvtestequipment.com


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