Western Electric theater amplifiers; how to hook them up? - diyAudio
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Old 23rd October 2011, 12:16 AM   #1
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Default Western Electric theater amplifiers; how to hook them up?

Hello all, new here.

I just came across a pair of IPC (Western Electric design) AM-1001 power amps. They've been dormant since the mid 1980s and I'm itching to give them a try. However, all my experience with tube amps has been with guitar gear and these are a different animal. It's a bit over my head to wire them up.

Each amp has a terminal strip with these positions:
Input
GND
RVC (four terminals)
FIL (two terminals)
OUTPUT
PLATE
MON+

In addition, they have the AC/common power leads. How would one wire this to a modern preamp output and a loudspeaker? I have the matching crossover network but I'll probably just hook to a modern full range speaker for now. Thanks all!
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Old 24th October 2011, 02:57 PM   #2
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Here's some pictures of what I'm talking about if that helps...

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Old 24th October 2011, 03:06 PM   #3
Pano is offline Pano  United States
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Thanks for the pic. Those amps are highly coveted, you have a nice find!
There should be someone here who can help. You'll want to power those up slowly, like with a variac or light bulb in series trick.

I'm very curious as to why the plate and filament are brought out to panel connections. Perhaps to power the preamp?
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Old 24th October 2011, 03:11 PM   #4
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Yep, was planning on using a Variac... these were in a theater that closed in 1986, so they've been sitting at least that long.

I was wondering if those plate/fil connections were for the preamp. Maybe they are superfluous for using the amps by themselves? A bit out of my realm of experience. Thanks!
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Old 24th October 2011, 03:21 PM   #5
Pano is offline Pano  United States
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You're welcome. If you don't get an answer here (not likely) then we can try over on the Altec forum.
It's a little scary to think that the B+ voltage could be sitting there on the a screw terminal.
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Old 24th October 2011, 03:41 PM   #6
martyh is offline martyh  United States
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RVC is remote volume control, jumper 1-2 and 3-4
Connect input + to input and to ground
Connect speaker between output and ground
Mon + and plate are DC and Fil is 6.3Vac for other parts of the system

Look here for the manual and schematic under C60 sound system
Film-Tech
Note the networks on the feedback loop for adjusting HF and LF
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Old 24th October 2011, 03:51 PM   #7
Trout is offline Trout  United States
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Quote:
Originally Posted by Micah McDowell View Post
Here's some pictures of what I'm talking about if that helps...

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Click the image to open in full size.

I hope you are going to replace that gassed tube before powering up.
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Old 24th October 2011, 03:55 PM   #8
Pano is offline Pano  United States
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Excellent! Here is a direct link to the manual:
http://www.film-tech.com/warehouse/m...SIMPLEXC60.pdf
The schematic appears on page 35.
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Old 24th October 2011, 04:00 PM   #9
Zen Mod is offline Zen Mod  Serbia
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yup - that most left tube is dude
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Old 24th October 2011, 04:02 PM   #10
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What's new set of matched 6L6? About $50?
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