Re: getting the AC mains out of the TR7
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Mark
Yes, good solutions for the fans and keeping the mains out and a simple switch to override the soft start resistor.
Nigel
Glenn,
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Mine is another vote for never looping the AC primary circuit into a transceiver.
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I had a similar idea to you. As the PS7 has no mains on/off switch of it's own, I thought I would get hold of a chassis mount version of the relevant miniature-Jones connector and mount it on a small box. Also on the box, I would install a mains on/off switch that connected across the relevant pins of the connector. Going further I thought, that small box could easily house a resistor and another switch to make a simple, manual soft-start arrangement for the power supply. Add a fuse to protect the soft-start resistor, plus suitable indicator(s) to make it fancy, if you like!
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Not done it yet, as those 10-pin connectors are hard to come by on this side of the pond, plus I've been powering my TR4310 and TR7 from Non-Drake supplies.
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I have changed the fans on both transceivers to common-or-garden 12 Volt, PC types. With the full 12 (13.8) V across them, they suck a lot of air, but are quite noisy in the process. So, I added a series resistor of around 50 Ohm in their DC feed. That reduces the voltage on the fans to something like 50% of rated and seemed to give a good compromise between airflow and dBA. I obtained the 12 V feed for the fans from one of the mini-Jones on the TR rear panel. I left the wiring and original connector in place for the Drake fan, to make the mod. was fully reversible / just in case a future owner does not share my outlook.
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Regards,
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Mark.
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