allwave fifteen amplifier schematic

[mike hadley]

I have been redrawing the allwave fifteen amplifier to include the jack socket part No.15 in the parts list.

as my aw15 does not have the hi-lo switch part No. 17, can anyone please tell me where this hi-lo switch is connected, and I will make the changes,

Thanks

[Thomas Day]

Mike:

If your power supply does not have the HI-Lo primary switch, then the power transformer does not have the extra wiring terminal for this. Is this a 220 volt chassis? Your drawing, which is excellent, shows only 14 connections for the power transformer which corresponds to the number of connections on the schematic, minus the extra primary tap. 

Thom

[mike hadley]

Thom;
I have just finished the long road of restoring my aw15, yes indeed it's a 220v model, and doesen't fit in with most of the current circuits available online, so I thought I would either redraw or modify what' available
No switch but there is a vacant hole in the chassis
Mike

[David C. Poland]

The vacant hole by the Jones plug normally has the high low switch for a domestic North American Scott. 

The down position is "low" meaning the AC voltage is between 100 and 115 volts AC.

The up position is "high", meaning the AC voltage is above 115 volts AC

Visual check is in the high (up) position, the filaments and dial lamp  dims a bit (and the B+ drops off a bit), which is a good thing. 

Evidently the  export model lacks the voltage switch.

[mike hadley]

David;

That means that the switch is marked s202 in the diagram, correct ?

the export model I have has the 'live' end connected to a three tier fuse holder, the transformer has taps for 200v, 220v and 240v.

if so I will correct the drawing.

Mike

[David C. Poland]

Yes - all my sets have a hi-lo switch (AC-10, AW-12, AW-15, AW-23 and Philharmonic). However, the later 1930's US small sets like the Sixteen, and Super 12 do not have the tapped primary.

I wonder then, for your export model, if you select the primary tap voltage by where you insert the fuse. The set no doubt came with an instruction sheet or diagram for fuse insertion to match to the ocal voltage. 

[mike hadley]

David,

I'm not sure if you have seen the voltage adjuster in a 220v chassis, here is a photo, adjustment is made by the fuse position, here in the uk set to 240v

here is a shot of the underside of my PSU / Amp with rewound transformer and stuffed caps

and a close up of the underside of my homemade cap cases, stuffed with 8uf Polypropylene motor run caps

[David C. Poland]

Thanks for photo - I had not seen an export model amp fuse set up.  Logical.