[ARC5] Solid State 6AL5

[Peter Gottlieb]

In my test set the 5R4 is set up as a full wave rectifier from a 1700 volt CT winding. At one point I thought the tube was weak and I’d replace with diodes. I have a bunch of 1N4007 but looking at the voltages I realized I needed three diodes for each plate!  And then equalization resistors, but with their max rated voltages I needed a lot of them. This started to be more trouble than it was worth and I was able to locate a replacement tube in my stash and just went with it. 


Peter

> On Feb 8, 2018, at 2:47 PM, Richard Knoppow <1oldlens1 at ix.netcom.com> wrote:
> 
>    I don't remember if I ever measured the resistance of the 5R4 replacement I have and don't know where it is now. However, the B+ with it installed was substantially higher than with the tube rectifier and it was small so I don't think it had anything but diodes in it.
> 
>> On 2/8/2018 10:17 AM, John Watkins via ARC5 wrote:
>> My solid state 6AL5s have just diodes and possibly a resistor in series with them (2 diodes).  They measure 16 Ohms forward resistance using a Simpson VOM on the Rx1 scale.off the upper end on both Rx1 and Rx100 for reverse.  Nothing in mine for heater load.  That is a no connection.  I haven’t removed the amber epoxy yet to see if the diodes have a 1N number.  Will report on that when I get back to town.
>> John WD5ENU
> 
> 
> -- 
> Richard Knoppow
> 1oldlens1 at ix.netcom.com
> WB6KBL
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