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The Basement
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<blockquote data-quote="John Roberts" data-source="post: 42996" data-attributes="member: 126"><p>Re: Sorry, but I had to show this.</p><p></p><p>My transformer was one huge lump (ExI core), but for reservoir capacitors I assembled 12 x 3750 uF computer grade surplus caps, screwed to a DIY PCB bus bar to make them act like 2 large caps. I had a relay that disconnected the speakers, so the amp didn't make any turn on/off noise. The old WE power supply had a trick 3 position power switch, so you could warm up the tube heaters before applying full power. I used the old switch, to slow charge my PS through a series resistor, then when I switched it to full on, the resistor was shorted out and the relay connected the speaks... That PS would dim the lights and perhaps eat fuses without that inrush current limiter.</p><p></p><p>Puny by todays standard, but back in the day with 1kW total I got noise complaints from the next street over. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>This was definitely not designed to be portable... even though it did have those two nice big handles. Those handles (cast bronze?) probably weight more than those uber-light modern class D amp. </p><p></p><p>JR</p></blockquote><p></p>
[QUOTE="John Roberts, post: 42996, member: 126"] Re: Sorry, but I had to show this. My transformer was one huge lump (ExI core), but for reservoir capacitors I assembled 12 x 3750 uF computer grade surplus caps, screwed to a DIY PCB bus bar to make them act like 2 large caps. I had a relay that disconnected the speakers, so the amp didn't make any turn on/off noise. The old WE power supply had a trick 3 position power switch, so you could warm up the tube heaters before applying full power. I used the old switch, to slow charge my PS through a series resistor, then when I switched it to full on, the resistor was shorted out and the relay connected the speaks... That PS would dim the lights and perhaps eat fuses without that inrush current limiter. Puny by todays standard, but back in the day with 1kW total I got noise complaints from the next street over. :-) This was definitely not designed to be portable... even though it did have those two nice big handles. Those handles (cast bronze?) probably weight more than those uber-light modern class D amp. JR [/QUOTE]
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