Quote:
Originally Posted by theredhouseinn
On the good amp you have got 3 blue wires on the GZ34 base, on the bad amp you have got 4 blue wires on the base. The extra blue wire is connected to the same tag as the brown wire. Or so it seems on the pic..
John.
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The 4th wire is there, it's just hidden behind the high voltage wires.
Quote:
Originally Posted by PYE 405
Going forward to when you have them working nicely, a little tip worth thinking about is what I have done with mine.
It is very simply to replace the 2A mains fuses with T750mA fuses. I do this because it offers a bit better protection, yet they still operates fine with my 22 and FM tuner connected. They have been like this for a few years now. (You need an anti-surge fuse to prevent any annoying fuse blowing from switch-on surges).
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I've also seen a Quad mod where they install a 250ma fuse on the high voltage line after the rectifier. I assume this is also a good thing to do?
Quote:
Originally Posted by cathoderay57
As far as the DC resistances of the output transformer primaries are concerned, Keith Snook says:
X-Y 115 to 125 Ohms
Y-Z 170 to 190 Ohms
Therefore your measurement of 120 Ohms X-Y on your good amp is good; 300 Ohms on the bad amp is bad, but make sure you were measuring the right terminals and that the meter probes were making a good connection. It's possible that you were measuring X-Z on the bad amp........ Jerry
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Double checked (always a good idea!), and it is just over 300 Ohms on the bad amp.