Electronics > Beginners

Identify giant transformer from 1978 tape reel

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MarkF:

--- Quote from: queennikki1972 on May 04, 2019, 11:19:36 pm ---Im sorry I missed what you said about the green secondary wires on primary side in your earlier post.

--- End quote ---

I don't know what you are referring to?

soldar:

--- Quote from: MarkF on May 05, 2019, 02:13:03 am ---According to your numbers, I think the transformer windings are like this.
It seems a little funny where the 120V tap is.  Maybe that makes a wiring connection that is simpler.
--- End quote ---
What if you look at it like this:

There is a good chance the two 120 V sections are of different wire thickness and resistance and the lower resistance winding should be used. BLK seems to be the common for all voltages and BRN for 120 V. Resistance measurements confirm this.

MarkF:

--- Quote from: soldar on May 05, 2019, 08:00:10 am ---
--- Quote from: MarkF on May 05, 2019, 02:13:03 am ---According to your numbers, I think the transformer windings are like this.
It seems a little funny where the 120V tap is.  Maybe that makes a wiring connection that is simpler.
--- End quote ---
What if you look at it like this:

There is a good chance the two 120 V sections are of different wire thickness and resistance and the lower resistance winding should be used. BLK seems to be the common for all voltages and BRN for 120 V. Resistance measurements confirm this.

--- End quote ---

If the BLK to BRN winding has a heavier gauge wire, why are they using the BRN to GRY winding for the 120V input which would require more current?

In the circuit diagrams, the 120V input has a 2A fuse while the 240V and 220V inputs have a 1A fuse.

soldar:

--- Quote from: MarkF on May 05, 2019, 10:29:09 am --- If the BLK to BRN winding has a heavier gauge wire, why are they using the BRN to GRY winding for the 120V input which would require more current?

In the circuit diagrams, the 120V input has a 2A fuse while the 240V and 220V inputs have a 1A fuse.
--- End quote ---
Where can I see the schematic?

MarkF:
There are two links above (copied here):
   https://www.esotericsound.com/SalesImages/rt-707sm.pdf
and
   https://elektrotanya.com/pioneer_rt-701_rt-707_art2540_additional.pdf/download.html#dl

You can also look at screen captures I posted earlier in this thread if you don't want to search the documents (Reply #19 and #20).


Edit:  The 120V transformer in the circuit diagram is a RTT-116.  I can't find the part no. for the 240V/220V transformer.
         The transformer she has is a RTT-118.

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