Re: {Collins} Rebuild and modernization of the 516F-2 power supply



I guess I don't understand this mod.  I thought you would use a 110 relay.  If the power supply is off, where does the 6.3 come from?  Aren't the filaments off?

Al
k5TAN



Sent from my iPad

> On Jun 12, 2014, at 8:59 PM, L L bahr  via Collins <collins@xxxxxxxxxxxxx> wrote:
> 
> 
> Clark, 
> 
> A 6.3 VAC relay would be ideal but very hard to find.  What I do is use a $5.00  12 VDC relay good for 10 amps.  You tap the 6.3 VAC filament line and build a simple  
> voltage doubler.  This will give you approximately 12 VDC.  Run this 12 VDC through the switch to turn on the relay.  I bought a few 12 volt relays from China off the auction 
> site and use them for this purpose.  (Ice cube type relays)  They work very well.  I also usually use a relay socket with the relay.  If you do this, make sure the relay socket will 
> fit under the 516F-2 chassis.  Many relay sockets were made for a "rail" and won't fit under a 516F-2 chassis.  As an alternative, you can silicon the side of the relay cube to 
> the 516F-2.   Not the best idea, but it does work if you don't have a socket.  (You use an 8 pin socket f or a DPDT commonly found relay)   
> 
> Lee, w0vt 
> 
> 
> Good suggestions on the selenium and electrolytic replacement. I've seen many comments about adding a power relay to save the fragile power switch.  Where could I find suggestions on the type of relay i.e. coil voltage 115AC or 12VDC (with some kind of rectifier off the filament lines)?  Of all the kits out there, I've not seen one with a relay in it. 
> 
> 
> 73, 
> 
> 
> Clark, WU4B
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