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Since I recently started looking, I've been seeing a -lot- of similar amps to these being sold on eBay; long narrow 6V6 Push Pull amps about 14w from IPC and many others licensed from Western Electic. I purchased a 'mondo' Bogan vintage theater amp in my "leason #1" thread, and I know about the Altec "Sound of the Theater" tube amps (I let one auction go buy I wish I would have won). They're all hi power. When were these amps used? Also, this amp has 3 6V6 tubes. Does anyone know 'when' the 3rd tube is used?I've read a lot about 'the 6v6 sound' here. It seems to be what I'd need in a home theater setup. I'm thinking I am going to give three of these a try as amps for the tweeters to be used above about 4.5K - 8K (I'll determine what the best x-over from the full-sized smith horns to the mini-smith horns should be; imlying tweeters are mini-smith horns on JBL 2402 drivers). The drivers are efficient, but that mini-smith horn really negates a lot of it. I'm not sure if 14w will cut it. I do like it 'loud'... ;) Has anyone used these amps as such? Can I expect decent treble output from the tubes and x-formers? Is the Bell & Howell name ok? There were some amps I was going to bid on that I decided not to based on some epic threads on old vintage tube amps I read here; I don't recall of B&H was included in the 'exclude' list.
Thanx again for all that provide some insight here and/or in the other 2 threads.
Follow Ups:
Tinydaddy, aka James Audio has the schematic for those I think. I gave him one of those and he turned it into a guitar amp. They are in almost every old, brown projector we all saw in use when in school. They are a good source of 6v6's and for whatever reason the tubes that come out of them have always tested as new for me.
John...
m8o, hi. Filmosound was Bell & Howell's name for the line of 16mm projectors they made. They were built into a kind of sound blimp to muffle projector noise. As the upper freq range for 35mm optical sound on film (roughly 90 feet per minute past the sound head) is 10kH the upper freq limit for 16 mm (much slower feet per minute) is quite a bit lower. There were other 16mm sound projectors designed for similar service - Ampro, Curtis Wright Animatograph, RCA, etc. One would have to test the freq response of projector amp to find out upper and lower limits. Bell & Howell also made cameras. The B&H EyeMo handheld had a 100 foot roll capacity and saw service in every theater of war in WWII. Bell & Howell made excellent equipment. My guess would be that a B&H amp would have wide bandwidth. Have fun!
Thanx so much for the informed reply. This forum is great. Wow, I had never considered that the film rate factored into potential frequency response, but like relating AM to FM, I get how it can/does. Thanx.
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