www.pbpix.com/ferguson-10tube.jpg
I'd really like to know the model number and try to find a schematic.
Someone wrote in pencil on the cabinet edge " Ten Tube TMHX"
Plays nicely as it is... but it certainly needs re-capping and clean-up etc etc.
I've tried to find the schematic here and there on the net ...so far to no avail.
The name plate on the front says "Ferguson Radio New York "
I also looked for the schematic under the Champion name.
My Mallory Encyclopedia only shows 2 Fergusons
My Stein Vol II doesn't show it at all.
It has two bands.... Broadcast & 2-7mhz
This interesting weird layout uses 10 tubes. Three are ballasts, two are rectifiers.
It's werid because I don't know why they needed 3 ballasts when all the filaments of the "radio" tubes all add up to about 100v anyway.
6A7, 6D6, 76, 6F5G, 25L6, - 25Z5, 25z5, - 33A, 33A, 67A
I can't quite grasp the twin 25Z5 rectifier arrangement either.
It appears that all the rectifier's plates (ANODEs) are tied together and are in parallel with each other.
But it seems that one set of Cathodes (acting as a 1`/2 wave rectifier) has a 30uf filter cap and feeds only the field coil??
And it looks like the other set of cathodes (acting as a 1`/2 wave rectifier) has another 50uf filter cap and then a 9mh choke feeding the B+
Any help guys is appreciated.
Peter
www.pbpix.com/radio
It might be a 106. A similar model is shown on page 95 of volume 3 of my machine age to jet age book.
Mike
:I just bought this dual band Ferguson on Ebay.
:
:www.pbpix.com/ferguson-10tube.jpg
:
:I'd really like to know the model number and try to find a schematic.
:
:Someone wrote in pencil on the cabinet edge " Ten Tube TMHX"
:
:Plays nicely as it is... but it certainly needs re-capping and clean-up etc etc.
:
:I've tried to find the schematic here and there on the net ...so far to no avail.
:The name plate on the front says "Ferguson Radio New York "
:I also looked for the schematic under the Champion name.
:
:My Mallory Encyclopedia only shows 2 Fergusons
:My Stein Vol II doesn't show it at all.
:
:It has two bands.... Broadcast & 2-7mhz
:
:This interesting weird layout uses 10 tubes. Three are ballasts, two are rectifiers.
:
:It's werid because I don't know why they needed 3 ballasts when all the filaments of the "radio" tubes all add up to about 100v anyway.
:
:6A7, 6D6, 76, 6F5G, 25L6, - 25Z5, 25z5, - 33A, 33A, 67A
:
:I can't quite grasp the twin 25Z5 rectifier arrangement either.
:
:It appears that all the rectifier's plates (ANODEs) are tied together and are in parallel with each other.
:
:But it seems that one set of Cathodes (acting as a 1`/2 wave rectifier) has a 30uf filter cap and feeds only the field coil??
:
:And it looks like the other set of cathodes (acting as a 1`/2 wave rectifier) has another 50uf filter cap and then a 9mh choke feeding the B+
:
:Any help guys is appreciated.
:
:Peter
:www.pbpix.com/radio
On high tube-count radios, it was not unusual to have two rectifers to get more B+ power.
A 25Z5 is a full-wave rectifier, with two plates and two cathodes. Probably, they paralleled the plates and cathodes of each 25Z5, and then treated them as two half-wave rectifiers to get back to full-wave rectification. That was the way Zenith did it.
:I just bought this dual band Ferguson on Ebay.
:
:www.pbpix.com/ferguson-10tube.jpg
:
:I'd really like to know the model number and try to find a schematic.
:
:Someone wrote in pencil on the cabinet edge " Ten Tube TMHX"
:
:Plays nicely as it is... but it certainly needs re-capping and clean-up etc etc.
:
:I've tried to find the schematic here and there on the net ...so far to no avail.
:The name plate on the front says "Ferguson Radio New York "
:I also looked for the schematic under the Champion name.
:
:My Mallory Encyclopedia only shows 2 Fergusons
:My Stein Vol II doesn't show it at all.
:
:It has two bands.... Broadcast & 2-7mhz
:
:This interesting weird layout uses 10 tubes. Three are ballasts, two are rectifiers.
:
:It's werid because I don't know why they needed 3 ballasts when all the filaments of the "radio" tubes all add up to about 100v anyway.
:
:6A7, 6D6, 76, 6F5G, 25L6, - 25Z5, 25z5, - 33A, 33A, 67A
:
:I can't quite grasp the twin 25Z5 rectifier arrangement either.
:
:It appears that all the rectifier's plates (ANODEs) are tied together and are in parallel with each other.
:
:But it seems that one set of Cathodes (acting as a 1`/2 wave rectifier) has a 30uf filter cap and feeds only the field coil??
:
:And it looks like the other set of cathodes (acting as a 1`/2 wave rectifier) has another 50uf filter cap and then a 9mh choke feeding the B+
:
:Any help guys is appreciated.
:
:Peter
:www.pbpix.com/radio
Peter Try Malcolm Bennett at http://www.dxzone.com/cgi-bin/dir/jump2.cgi?ID=9625
:Doug:
:Thanks... but as I think I understand it with my feeble brain(lol) ...in order to use these two 25z5s in a full wave rectification mode wouldn't they have be used with a center tapped transformer?
:.. or without a transformer they'd need 4 of them in a bridge layout ... no?
:
: