[GreenKeys] 6AU4 SS replacement?

[Duncan M. Brown]

It looks like "1N1262" is the part number of the SS replacement. It is
undoubtablely made up of individual diodes. (most diodes can't take more
than 600-700V) in series.  

I found a spec sheet for the 1N1262 at
http://www.datasheets.org.uk/specsheet.php?part=1N1262
but it doesn't give a peak current rating.  However, it is obviously made
for HV power supplies and should work OK with a choke input supply. It
certainly is big enough to hold large diodes that could withstand the surge.

Try Googling "1N1262" (there were over 100 hits and I only looked at a few
of them) Also try the Sarkes Tarzian website.

73, & good luck
Duncan Brown, K2OEQ

AWA Electronic Communication Museum
http://www.antiquewireless.org/



> [Original Message]
> From: Eugene Hertz <eugene at hertzmail.com>
> To: <boatanchors at mailman.qth.net>; <greenkeys at mailman.qth.net>
> Date: 10-Mar-07 11:02:06
> Subject: [GreenKeys] 6AU4 SS replacement?
>
> Hi All,
>
> While trying to set the FSK shift on my transmitter last night, it
coughed up some smoke. I pretty sure the smoke was from one of the 6AU4
rectifier tubes used in a 600V supply (for 6550 finals).
>
> I am thinking about replacing the rectifiers with solid state. You may
ask why? Simple answer is there are 3 rectifiers in the transmitter
consuming a total of 37W of filament power and heat.  For those concerned,
I always run the transmitter through a variac and can adjust it down to
lower the B+.  Also, as far as inrush through the power transformer, I
think I'm ok because the power transformer does not directly feed filter
caps, it first goes through some mighty chokes. So I think the choke will
moderate the current filling up those capacitors.
>
> In any case, the real question is, does anyone have any experience with
SS replacements for the 6AU4? My google research has only located one which
can be found here:  http://tinyurl.com/2crs5e
>
> This is the only one I've located. Anyone ever use this brand? Anyone
know of any other product? Seems like embedded in this is a (or more than
one?) 1N1262. I wonder if they do anything else like series resistance,
good heatsinking or anything fancier. Otherwise, why couldn't I just wire
in a 1N1262? (maybe 2 in parallel for more forward current?).
>
> Transmitter also has a 5U4 which I will probably replace with the weber
copper cap.
>
> Any thoughts welcome.
> [If responding to the list, note that I have cross-posted, so only reply
to the list you belong to so that I may avoid the ire of the list gods ]
> thanks! Eugene
>
>
>
>
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