Help connecting Power Transformer

[deuce42]

Hi Guys

This may be rudimentary but could you assist me with the correct connections for a super reverb project.

Attached is:
1) 65 super reverb schematic; and
2) Schematic for my transformer.

I live in 240vac land, so judging by my transformer's schematic, I should use the black and white wires for the xformer's primaries. My confusion is that on the bottom left corner of the 65 super schematic, I can't work out where I attach these primaries. Is it P1 and P3 only, or do I attach another primary wire at P2 and if so which one?

Also, it seems that on the 65 super schematic, the white and black wires are the reverse of the my transformer? Am I right in saying therefore that where the 65 schematic lists white I should connect black and vice versa? Does that also mean that on the other side of the power filtering part of the 65 schematic (i.e. next to the power switch), the black going to live and the white going to neutral should also be reversed?

It's obviously the most dangerous part of the circuit and one I don't want to get wrong!

Thanks very much in advance

[martin manning]

On your transformer diagram the 240V primary leads are black and white. It really doesn't matter which way you connect them. Are you replacing the power cable as well, or is that already set uo? If you are replacing it, make sure that the active pin (hot side) is connected through the fuse.

[deuce42]

Thanks for the reply. I'll put in my own cable and make sure the live goes through the fuse.

If it doesn't matter which primary wire is used that's great, but as for connecting to the filtering part, does it just go p1 and p3 of the super 65 schematic?

[martin manning]

The black and white primary leads go to P1 and P2. What do you mean by filtering part? The secondary?

[deuce42]

Oh I mean the part between the power switch and the primaries of the xformer. I had thought this part of the schematic was like an EMI filter or similar concept.

As for P1 and P2, in the left corner of the 65 schematic, should the 240v primary taps not to got p1 and p3 rather than p2?

My apologies for such confusion

[morcey2]

P3 is simply a tie-off point that isolates the extra unused lead on the original 240V transformer. It isn't an electrical connection at all. Pretend anything that's connected to P3 doesn't exist.

As for the cap and resistor (I think that's what RT1 is) on the mains, ignore them for the moment also. The cap would need to be an X-rated capacitor, not just a normal cap. It's to filter RFI and EMI noise off the mains.

Matt

[martin manning]

RT1 is a thermistor, which limits inrush current. Current at 240V will be half of what it is at 120, but the 240V wiring schematic does not show any change so it's probably ok. I would think the cap should be rated at 2x it's current rating, but again it is not shown in the 240V diagram.

[Structo]

I wouldn't build it to those specs of a reissue amp, especially since it is designed for a printed circuit board.

Or are you simply repairing this amp?

Ask around what the favorite Super Reverb circuit is.

For example, this is a aa270.

The strange thing with the super reverb's was that they used four 8 ohm speakers in parallel, creating a 2 ohm load.

So the choice of a output transformer is key if you want to got that route.
Or simply get a OT that is designed for 2x 6L6's @ around 50 watts.

[deuce42]

Oh thank you for this advice guys. It makes sense to me now.