looking for Northcourt 30 info

jimirob · 11-04-2007, 04:45 PM

Just bought a working 1965 (UK) Northcourt 30 head on ebay.

I'm looking for schematics - particularly the spec on the main transformer - so I can replace the (looks hand wound) 220vac/50hz input transformer and use USA 115vac/60hz.

Any suggestions?

Days of searching have turned up nothing more than references to this mid-60's 'poor man's Marshall JTM 45' knock off - but no clues on where to get specs.

Enzo · 11-06-2007, 02:51 AM

So if it is more or less a JTM 45, then look at the JTM 45 drawings. Ought to be close if that is the case.

I assume the only real question is the B+ winding. Since the amp works, connect 220 to it and measure the voltages inside. The voltages on the secondary side will be the same regardless of 120/220. the 50/60Hz thing shouldn't make much difference.

11-04-2007, 04:45 PM	#1
jimirob Junior Member Join Date: Nov 2007 Posts: 1	looking for Northcourt 30 info Just bought a working 1965 (UK) Northcourt 30 head on ebay. I'm looking for schematics - particularly the spec on the main transformer - so I can replace the (looks hand wound) 220vac/50hz input transformer and use USA 115vac/60hz. Any suggestions? Days of searching have turned up nothing more than references to this mid-60's 'poor man's Marshall JTM 45' knock off - but no clues on where to get specs.

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11-06-2007, 02:51 AM	#2
Enzo Senior Member Join Date: May 2006 Location: Lansing, Michigan, USA Posts: 10,366	So if it is more or less a JTM 45, then look at the JTM 45 drawings. Ought to be close if that is the case. I assume the only real question is the B+ winding. Since the amp works, connect 220 to it and measure the voltages inside. The voltages on the secondary side will be the same regardless of 120/220. the 50/60Hz thing shouldn't make much difference.

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