[R-390] Sources for HP410C AC Probe

[Scott]

Don----

A 6X5 sounds a little big for use in a probe---how about using a 6AL5 double 
diode with both sides in parallel? A 6AL5 is only good for about 400 volts 
rather than the 1000 volts that the EA53 can stand but 400 volts is plenty 
for most applications and the 6AL5 is tiny by comparison an also offers 
similar heater to cathode capability.

Scott


----- Original Message ----- 
From: "2002tii" <bmw2002tii at nerdshack.com>
To: <R-390 at mailman.qth.net>
Sent: Sunday, May 17, 2009 10:06 AM
Subject: Re: [R-390] Sources for HP410C AC Probe


> David wrote:
>
>>Was that a 1,2,3,or 4 reel 35mm film can you built those in?
>>I had to chuckle at that, my dad ran a trucking outfit way back when
>>delivering 35mm film all over Texas.
>
> We were po boys, we only had the single cans.  You could just squeeze
> a 6X5 probe into one can if you were careful.  If you had an EA53
> (the tube that HP used), you had to cut out the ends and splice cans
> together.  I built several probes into the bodies of trashed Neumann
> microphones (we had a pile of those after one client found out the
> hard way that they weren't up to rock-n-roll on the road).
>
> By the way, you don't have to use an EA53 for most things you'll want
> to do -- a 6X5 will work fine.  Note that most HP 11036A probes that
> you find on the market today will need a new EA53, so make sure you
> know where to find one (and budget accordingly) before buying a used 
> probe.
>
> Best regards,
>
> Don
>
>
>
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